Prepare for v3

LICENSE.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright © 2020 Nikita Tokarchuk
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1 +1,21 @@
-mongox-go-driver
+# mongox-go-driver
+
+## testing locally
+
+reqs:
+- mongodb v4.0 or newer run on localhost
+- golang v1.13 or newer
+
+test it by calling go tests
+```sh
+$ go test ./...
+```
+
+## testing by using dockerfile
+
+reqs:
+- docker with buildkit
+
+```sh
+$ DOCKER_BUILDKIT=1 docker build -t mongox-testing -f testing.Dockerfile .
+```

go.mod

@@ -1,14 +1,10 @@
 module github.com/mainnika/mongox-go-driver/v2
 
-require (
-	github.com/google/go-cmp v0.3.0 // indirect
-	github.com/klauspost/compress v1.10.1 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
-	github.com/stretchr/testify v1.5.1
-	github.com/xdg/stringprep v1.0.0 // indirect
-	go.mongodb.org/mongo-driver v1.3.0
-	golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d // indirect
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
-)
-
 go 1.13
+
+require (
+	github.com/modern-go/reflect2 v1.0.2
+	github.com/stretchr/testify v1.8.4
+	github.com/valyala/bytebufferpool v1.0.0
+	go.mongodb.org/mongo-driver v1.11.6
+)

go.sum

@@ -1,119 +1,66 @@
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-golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/crypto v0.0.0-20220622213112-05595931fe9d/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
-golang.org/x/sync v0.0.0-20190412183630-56d357773e84/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e h1:vcxGaoTs7kV8m5Np9uUNQin4BrLOthgV7252N8V+FwY=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
-golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190419153524-e8e3143a4f4a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190531175056-4c3a928424d2/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
-golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
-golang.org/x/tools v0.0.0-20190329151228-23e29df326fe/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/tools v0.0.0-20190416151739-9c9e1878f421/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190420181800-aa740d480789/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190531172133-b3315ee88b7d/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

mongox-testing/database/ephemeral.go

@@ -2,9 +2,9 @@ package database
 
 import (
 	"context"
-	"math/rand"
+	"os"
-	"strconv"
 
+	"go.mongodb.org/mongo-driver/bson/primitive"
 	"go.mongodb.org/mongo-driver/mongo"
 	"go.mongodb.org/mongo-driver/mongo/options"
 
@@ -12,24 +12,44 @@ import (
 	"github.com/mainnika/mongox-go-driver/v2/mongox/database"
 )
 
+// defaultURI is a mongodb uri that is being used by tests
+var defaultURI = "mongodb://localhost"
+
 // EphemeralDatabase is a temporary database connection that will be destroyed after close
 type EphemeralDatabase struct {
 	mongox.Database
 }
 
+func init() {
+	envURI := os.Getenv("MONGODB_URI")
+	if envURI != "" {
+		defaultURI = envURI
+	}
+}
+
 // NewEphemeral creates new mongo connection
 func NewEphemeral(URI string) (db *EphemeralDatabase, err error) {
+	return NewEphemeralWithContext(context.Background(), URI)
+}
 
-	name := strconv.Itoa(rand.Int())
+func NewEphemeralWithContext(ctx context.Context, URI string) (db *EphemeralDatabase, err error) {
+	if URI == "" {
+		URI = defaultURI
+	}
+
+	name := primitive.NewObjectID().Hex()
 	opts := options.Client().ApplyURI(URI)
-	client, err := mongo.Connect(context.Background(), opts)
+	client, err := mongo.Connect(ctx, opts)
+	if err != nil {
+		return nil, err
+	}
 
-	db = &EphemeralDatabase{Database: database.NewDatabase(client, name)}
+	db = &EphemeralDatabase{Database: database.NewDatabase(ctx, client, name)}
 
-	return
+	return db, nil
 }
 
 // Close the connection and drop database
-func (e *EphemeralDatabase) Close() error {
+func (e *EphemeralDatabase) Close() (err error) {
 	return e.Client().Database(e.Name()).Drop(e.Context())
 }

mongox/base/docbased/id.go

@@ -0,0 +1,44 @@
+package docbased
+
+import (
+	"github.com/modern-go/reflect2"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+
+	"github.com/mainnika/mongox-go-driver/v2/mongox"
+)
+
+var _ mongox.DocBased = (*Primary)(nil)
+
+// Primary is a structure with object as an _id field
+type Primary struct {
+	ID primitive.D `bson:"_id" json:"_id"`
+}
+
+// GetID returns an _id
+func (p *Primary) GetID() (id primitive.D) {
+	return p.ID
+}
+
+// SetID sets an _id
+func (p *Primary) SetID(id primitive.D) {
+	p.ID = id
+}
+
+// New creates a new Primary structure with a defined _id
+func New(e primitive.E, ee ...primitive.E) Primary {
+	id := primitive.D{e}
+	if len(ee) > 0 {
+		id = append(id, ee...)
+	}
+
+	return Primary{ID: id}
+}
+
+func GetID(source mongox.DocBased) (id primitive.D, err error) {
+	id = source.GetID()
+	if !reflect2.IsNil(id) {
+		return id, nil
+	}
+
+	return nil, mongox.ErrUninitializedBase
+}

mongox/base/docbased/id_test.go

@@ -1,4 +1,4 @@
-package jsonbased
+package docbased_test
 
 import (
 	"encoding/json"
@@ -8,26 +8,25 @@ import (
 	"go.mongodb.org/mongo-driver/bson/primitive"
 
 	"github.com/mainnika/mongox-go-driver/v2/mongox-testing/database"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/docbased"
 )
 
 func Test_GetID(t *testing.T) {
-
 	type DocWithObject struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		docbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	doc := &DocWithObject{Primary{primitive.D{{"1", "one"}, {"2", "two"}}}}
+	doc := &DocWithObject{Primary: docbased.New(primitive.E{"1", "one"}, primitive.E{"2", "two"})}
 
 	assert.Equal(t, primitive.D{{"1", "one"}, {"2", "two"}}, doc.GetID())
 }
 
 func Test_SetID(t *testing.T) {
-
 	type DocWithObject struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		docbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	doc := &DocWithObject{Primary{primitive.D{{"1", "one"}, {"2", "two"}}}}
+	doc := &DocWithObject{Primary: docbased.New(primitive.E{"1", "one"}, primitive.E{"2", "two"})}
 
 	doc.SetID(primitive.D{{"3", "three"}, {"4", "you"}})
 
@@ -36,19 +35,18 @@ func Test_SetID(t *testing.T) {
 }
 
 func Test_SaveLoad(t *testing.T) {
-
 	type DocWithObjectID struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		docbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	db, err := database.NewEphemeral("mongodb://localhost")
+	db, err := database.NewEphemeral("")
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
-	doc1 := &DocWithObjectID{Primary{primitive.D{{"1", "one"}, {"2", "two"}}}}
+	doc1 := &DocWithObjectID{Primary: docbased.New(primitive.E{"1", "one"}, primitive.E{"2", "two"})}
 	doc2 := &DocWithObjectID{}
 
 	err = db.SaveOne(doc1)
@@ -66,13 +64,11 @@ func Test_SaveLoad(t *testing.T) {
 }
 
 func Test_Marshal(t *testing.T) {
-
 	type DocWithObjectID struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		docbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	id := primitive.D{{"1", "one"}, {"2", "two"}}
+	doc := &DocWithObjectID{Primary: docbased.New(primitive.E{"1", "one"}, primitive.E{"2", "two"})}
-	doc := &DocWithObjectID{Primary{id}}
 
 	bytes, err := json.Marshal(doc)
 	assert.NoError(t, err)

mongox/base/getid.go

@@ -2,70 +2,26 @@ package base
 
 import (
 	"fmt"
-
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/docbased"
-	"go.mongodb.org/mongo-driver/bson/primitive"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/ifacebased"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/oidbased"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/stringbased"
 
 	"github.com/mainnika/mongox-go-driver/v2/mongox"
-	"github.com/mainnika/mongox-go-driver/v2/mongox/utils"
 )
 
 // GetID returns source document id
-func GetID(source interface{}) (id interface{}) {
+func GetID(source interface{}) (id interface{}, err error) {
-
 	switch doc := source.(type) {
 	case mongox.OIDBased:
-		return getObjectIDOrGenerate(doc)
+		return oidbased.GetID(doc)
 	case mongox.StringBased:
-		return getStringIDOrPanic(doc)
+		return stringbased.GetID(doc)
-	case mongox.JSONBased:
+	case mongox.DocBased:
-		return getObjectOrPanic(doc)
+		return docbased.GetID(doc)
 	case mongox.InterfaceBased:
-		return getInterfaceOrPanic(doc)
+		return ifacebased.GetID(doc)
-
 	default:
-		panic(fmt.Errorf("source contains malformed document, %v", source))
+		return nil, fmt.Errorf("%w: unknown base type", mongox.ErrMalformedBase)
 	}
 }
-
-func getObjectIDOrGenerate(source mongox.OIDBased) (id primitive.ObjectID) {
-
-	id = source.GetID()
-	if id != primitive.NilObjectID {
-		return id
-	}
-
-	id = primitive.NewObjectID()
-	source.SetID(id)
-
-	return
-}
-
-func getStringIDOrPanic(source mongox.StringBased) (id string) {
-
-	id = source.GetID()
-	if id != "" {
-		return id
-	}
-
-	panic(fmt.Errorf("source contains malformed document, %v", source))
-}
-
-func getObjectOrPanic(source mongox.JSONBased) (id primitive.D) {
-
-	id = source.GetID()
-	if id != nil {
-		return id
-	}
-
-	panic(fmt.Errorf("source contains malformed document, %v", source))
-}
-
-func getInterfaceOrPanic(source mongox.InterfaceBased) (id interface{}) {
-
-	id = source.GetID()
-	if !utils.IsNil(id) {
-		return id
-	}
-
-	panic(fmt.Errorf("source contains malformed document, %v", source))
-}

mongox/base/getid_test.go

@@ -1,12 +1,14 @@
-package base
+package base_test
 
 import (
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/docbased"
+	"github.com/stretchr/testify/require"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 
-	"github.com/mainnika/mongox-go-driver/v2/mongox/base/jsonbased"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/base/oidbased"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/base/stringbased"
 )
@@ -28,15 +30,24 @@ func TestGetID(t *testing.T) {
 	type DocWithObjectID struct {
 		oidbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
+	id, err := base.GetID(&DocWithObjectID{Primary: oidbased.Primary{ID: [12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2}}})
+	require.NoError(t, err)
+	assert.Equal(t, primitive.ObjectID([12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2}), id)
+
 	type DocWithObject struct {
-		jsonbased.Primary `bson:",inline" json:",inline" collection:"2"`
+		docbased.Primary `bson:",inline" json:",inline" collection:"2"`
 	}
+	id, err = base.GetID(&DocWithObject{Primary: docbased.Primary{ID: primitive.D{{"1", "2"}}}})
+	require.NoError(t, err)
+	assert.Equal(t, primitive.D{{"1", "2"}}, id)
+
 	type DocWithString struct {
 		stringbased.Primary `bson:",inline" json:",inline" collection:"3"`
 	}
+	id, err = base.GetID(&DocWithString{Primary: stringbased.Primary{ID: "foobar"}})
+	assert.Equal(t, "foobar", id)
 
-	assert.Equal(t, primitive.ObjectID([12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2}), GetID(&DocWithObjectID{oidbased.Primary{[12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2}}}))
+	id, err = base.GetID(&DocWithCustomInterface{ID: 420})
-	assert.Equal(t, primitive.D{{"1", "2"}}, GetID(&DocWithObject{jsonbased.Primary{primitive.D{{"1", "2"}}}}))
+	assert.NoError(t, err)
-	assert.Equal(t, "foobar", GetID(&DocWithString{stringbased.Primary{"foobar"}}))
+	assert.Equal(t, 420, id)
-	assert.Equal(t, 420, GetID(&DocWithCustomInterface{ID: 420}))
 }

mongox/base/getprotection.go

@@ -1,38 +0,0 @@
-package base
-
-import (
-	"reflect"
-
-	"github.com/mainnika/mongox-go-driver/v2/mongox/base/protection"
-)
-
-// GetProtection function finds protection field in the source document otherwise returns nil
-func GetProtection(source interface{}) *protection.Key {
-
-	v := reflect.ValueOf(source)
-	if v.Kind() != reflect.Ptr || v.IsNil() {
-		return nil
-	}
-
-	el := v.Elem()
-	numField := el.NumField()
-
-	for i := 0; i < numField; i++ {
-		field := el.Field(i)
-		if !field.CanInterface() {
-			continue
-		}
-
-		switch field.Interface().(type) {
-		case *protection.Key:
-			return field.Interface().(*protection.Key)
-		case protection.Key:
-			ptr := field.Addr()
-			return ptr.Interface().(*protection.Key)
-		default:
-			continue
-		}
-	}
-
-	return nil
-}

mongox/base/ifacebased/id.go

@@ -0,0 +1,16 @@
+package ifacebased
+
+import (
+	"github.com/mainnika/mongox-go-driver/v2/mongox"
+	"github.com/modern-go/reflect2"
+)
+
+// GetID returns an _id from the source document
+func GetID(source mongox.InterfaceBased) (id interface{}, err error) {
+	id = source.GetID()
+	if !reflect2.IsNil(id) {
+		return id, nil
+	}
+
+	return nil, mongox.ErrUninitializedBase
+}

mongox/base/jsonbased/id.go

@@ -1,24 +0,0 @@
-package jsonbased
-
-import (
-	"go.mongodb.org/mongo-driver/bson/primitive"
-
-	"github.com/mainnika/mongox-go-driver/v2/mongox"
-)
-
-var _ mongox.JSONBased = (*Primary)(nil)
-
-// Primary is a structure with object as an _id field
-type Primary struct {
-	ID primitive.D `bson:"_id" json:"_id"`
-}
-
-// GetID returns an _id
-func (p *Primary) GetID() primitive.D {
-	return p.ID
-}
-
-// SetID sets an _id
-func (p *Primary) SetID(id primitive.D) {
-	p.ID = id
-}

mongox/base/oidbased/id.go

@@ -14,7 +14,7 @@ type Primary struct {
 }
 
 // GetID returns an _id
-func (p *Primary) GetID() primitive.ObjectID {
+func (p *Primary) GetID() (id primitive.ObjectID) {
 	return p.ID
 }
 
@@ -22,3 +22,22 @@ func (p *Primary) GetID() primitive.ObjectID {
 func (p *Primary) SetID(id primitive.ObjectID) {
 	p.ID = id
 }
+
+// Generate creates a new Primary structure with a new objectId
+func Generate() Primary {
+	return Primary{ID: primitive.NewObjectID()}
+}
+
+// New creates a new Primary structure with a defined objectId
+func New(id primitive.ObjectID) Primary {
+	return Primary{ID: id}
+}
+
+func GetID(source mongox.OIDBased) (id primitive.ObjectID, err error) {
+	id = source.GetID()
+	if id != primitive.NilObjectID {
+		return id, nil
+	}
+
+	return primitive.NilObjectID, mongox.ErrUninitializedBase
+}

mongox/base/oidbased/id_test.go

@@ -1,4 +1,4 @@
-package oidbased
+package oidbased_test
 
 import (
 	"encoding/json"
@@ -8,27 +8,26 @@ import (
 	"go.mongodb.org/mongo-driver/bson/primitive"
 
 	"github.com/mainnika/mongox-go-driver/v2/mongox-testing/database"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/oidbased"
 )
 
 func Test_GetID(t *testing.T) {
-
 	type DocWithObjectID struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		oidbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	doc := &DocWithObjectID{Primary{[12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2}}}
+	doc := &DocWithObjectID{Primary: oidbased.New([12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2})}
 
+	assert.Equal(t, primitive.ObjectID([12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2}), doc.Primary.ID)
 	assert.Equal(t, primitive.ObjectID([12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2}), doc.GetID())
 }
 
 func Test_SetID(t *testing.T) {
-
 	type DocWithObjectID struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		oidbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	doc := &DocWithObjectID{}
+	doc := &DocWithObjectID{Primary: oidbased.Generate()}
-
 	doc.SetID([12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2})
 
 	assert.Equal(t, primitive.ObjectID([12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2}), doc.Primary.ID)
@@ -36,20 +35,19 @@ func Test_SetID(t *testing.T) {
 }
 
 func Test_SaveLoad(t *testing.T) {
-
 	type DocWithObjectID struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		oidbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	db, err := database.NewEphemeral("mongodb://localhost")
+	db, err := database.NewEphemeral("")
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
-	doc1 := &DocWithObjectID{}
+	doc1 := &DocWithObjectID{Primary: oidbased.Generate()}
-	doc2 := &DocWithObjectID{}
+	doc2 := &DocWithObjectID{Primary: oidbased.Generate()}
 
 	err = db.SaveOne(doc1)
 	assert.NoError(t, err)
@@ -66,13 +64,12 @@ func Test_SaveLoad(t *testing.T) {
 }
 
 func Test_Marshal(t *testing.T) {
-
 	type DocWithObjectID struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		oidbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
 	id, _ := primitive.ObjectIDFromHex("feadbeeffeadbeeffeadbeef")
-	doc := &DocWithObjectID{Primary{id}}
+	doc := &DocWithObjectID{Primary: oidbased.New(id)}
 
 	bytes, err := json.Marshal(doc)
 	assert.NoError(t, err)

mongox/base/protection/key.go

@@ -1,6 +1,10 @@
 package protection
 
 import (
+	"reflect"
+	"time"
+
+	"github.com/modern-go/reflect2"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 )
 
@@ -9,3 +13,56 @@ type Key struct {
 	X primitive.ObjectID `bson:"_x" json:"_x" index:",hashed"`
 	V int64              `bson:"_v" json:"_v"`
 }
+
+// Inject extends the doc with protection key values
+func (k *Key) Inject(doc primitive.M) {
+	if reflect2.IsNil(doc) {
+		return
+	}
+
+	if k.X.IsZero() {
+		doc["_x"] = primitive.M{"$exists": false}
+		doc["_v"] = primitive.M{"$exists": false}
+	} else {
+		doc["_x"] = k.X
+		doc["_v"] = k.V
+	}
+}
+
+// Restate creates a new protection key
+func (k *Key) Restate() {
+	k.X = primitive.NewObjectID()
+	k.V = time.Now().Unix()
+}
+
+// Get finds protection field in the source document otherwise returns nil
+func Get(source interface{}) (key *Key) {
+	v := reflect.ValueOf(source)
+	if v.Kind() != reflect.Ptr || v.IsNil() {
+		return nil
+	}
+
+	el := v.Elem()
+	numField := el.NumField()
+
+	for i := 0; i < numField; i++ {
+		field := el.Field(i)
+		if !field.CanInterface() {
+			continue
+		}
+
+		switch field.Interface().(type) {
+		case *Key:
+			key = field.Interface().(*Key)
+		case Key:
+			ptr := field.Addr()
+			key = ptr.Interface().(*Key)
+		default:
+			continue
+		}
+
+		return key
+	}
+
+	return nil
+}

mongox/base/protection/key_test.go

@@ -0,0 +1,3 @@
+package protection_test
+
+// TODO:

mongox/base/reset.go

@@ -1,12 +1,12 @@
 package base
 
 import (
+	"fmt"
 	"reflect"
 )
 
 // Reset function creates new zero object for the target pointer
-func Reset(target interface{}) {
+func Reset(target interface{}) (created bool) {
-
 	type resetter interface {
 		Reset()
 	}
@@ -14,16 +14,18 @@ func Reset(target interface{}) {
 	resettable, canReset := target.(resetter)
 	if canReset {
 		resettable.Reset()
-		return
+		return false
 	}
 
 	v := reflect.ValueOf(target)
 	if v.Kind() != reflect.Ptr {
-		panic("reset target should be a pointer")
+		panic(fmt.Errorf("reset target should be a pointer"))
 	}
 
 	t := v.Elem().Type()
 	zero := reflect.Zero(t)
 
 	v.Elem().Set(zero)
+
+	return true
 }

mongox/base/stringbased/id.go

@@ -12,7 +12,7 @@ type Primary struct {
 }
 
 // GetID returns an _id
-func (p *Primary) GetID() string {
+func (p *Primary) GetID() (id string) {
 	return p.ID
 }
 
@@ -20,3 +20,17 @@ func (p *Primary) GetID() string {
 func (p *Primary) SetID(id string) {
 	p.ID = id
 }
+
+// New creates a new Primary structure with a defined _id
+func New(id string) Primary {
+	return Primary{ID: id}
+}
+
+func GetID(source mongox.StringBased) (id string, err error) {
+	id = source.GetID()
+	if id != "" {
+		return id, nil
+	}
+
+	return "", mongox.ErrUninitializedBase
+}

mongox/base/stringbased/id_test.go

@@ -1,4 +1,4 @@
-package stringbased
+package stringbased_test
 
 import (
 	"encoding/json"
@@ -7,26 +7,25 @@ import (
 	"github.com/stretchr/testify/assert"
 
 	"github.com/mainnika/mongox-go-driver/v2/mongox-testing/database"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/stringbased"
 )
 
 func Test_GetID(t *testing.T) {
-
 	type DocWithString struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		stringbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	doc := &DocWithString{Primary{"foobar"}}
+	doc := &DocWithString{Primary: stringbased.New("foobar")}
 
 	assert.Equal(t, "foobar", doc.GetID())
 }
 
 func Test_SetID(t *testing.T) {
-
 	type DocWithString struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		stringbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	doc := &DocWithString{Primary{"foobar"}}
+	doc := &DocWithString{Primary: stringbased.New("foobar")}
 
 	doc.SetID("rockrockrock")
 
@@ -35,19 +34,18 @@ func Test_SetID(t *testing.T) {
 }
 
 func Test_SaveLoad(t *testing.T) {
-
 	type DocWithObjectID struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		stringbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	db, err := database.NewEphemeral("mongodb://localhost")
+	db, err := database.NewEphemeral("")
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
-	doc1 := &DocWithObjectID{Primary{"foobar"}}
+	doc1 := &DocWithObjectID{Primary: stringbased.New("foobar")}
 	doc2 := &DocWithObjectID{}
 
 	err = db.SaveOne(doc1)
@@ -65,12 +63,11 @@ func Test_SaveLoad(t *testing.T) {
 }
 
 func Test_Marshal(t *testing.T) {
-
 	type DocWithObjectID struct {
-		Primary `bson:",inline" json:",inline" collection:"1"`
+		stringbased.Primary `bson:",inline" json:",inline" collection:"1"`
 	}
 
-	doc := &DocWithObjectID{Primary{"foobar"}}
+	doc := &DocWithObjectID{Primary: stringbased.New("foobar")}
 
 	bytes, err := json.Marshal(doc)
 	assert.NoError(t, err)

mongox/database/context.go

@@ -0,0 +1,23 @@
+package database
+
+import (
+	"context"
+)
+
+type ctxDatabaseKey struct{}
+
+// GetFromContext function extracts the request data from context
+func GetFromContext(ctx context.Context) (q *Database, ok bool) {
+	q, ok = ctx.Value(ctxDatabaseKey{}).(*Database)
+	if !ok {
+		return nil, false
+	}
+
+	return q, true
+}
+
+// WithContext creates the new context with a database attached
+func WithContext(ctx context.Context, q *Database) (withQuery context.Context) {
+	db := NewDatabase(ctx, q.Client(), q.Name())
+	return context.WithValue(ctx, ctxDatabaseKey{}, db)
+}

mongox/database/count.go

@@ -1,31 +1,36 @@
 package database
 
 import (
-	"fmt"
-
 	"go.mongodb.org/mongo-driver/mongo/options"
 
-	"github.com/mainnika/mongox-go-driver/v2/mongox"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
 )
 
 // Count function counts documents in the database by query
 // target is used only to get collection by tag so it'd be better to use nil ptr here
-func (d *Database) Count(target interface{}, filters ...interface{}) (int64, error) {
+func (d *Database) Count(target interface{}, filters ...interface{}) (result int64, err error) {
+	composed, err := query.Compose(filters...)
+	if err != nil {
+		return -1, err
+	}
+
+	collection, err := d.GetCollectionOf(target)
+	if err != nil {
+		return -1, err
+	}
+	ctx := query.WithContext(d.Context(), composed)
+
+	m := composed.M()
 
-	collection := d.GetCollectionOf(target)
 	opts := options.Count()
-	composed := query.Compose(filters...)
-
 	opts.Limit = composed.Limiter()
 	opts.Skip = composed.Skipper()
 
-	result, err := collection.CountDocuments(d.Context(), composed.M(), opts)
+	defer func() { _ = composed.OnClose().Invoke(ctx, target) }()
-	if err == mongox.ErrNoDocuments {
+
-		return 0, err
+	result, err = collection.CountDocuments(ctx, m, opts)
-	}
 	if err != nil {
-		return 0, fmt.Errorf("can't decode desult: %w", err)
+		return -1, err
 	}
 
 	return result, nil

mongox/database/cursor.go

@@ -0,0 +1,188 @@
+package database
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo/options"
+
+	"github.com/mainnika/mongox-go-driver/v2/mongox"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
+)
+
+func (d *Database) createCursor(target interface{}, composed *query.Query) (cursor *mongox.Cursor, err error) {
+	_, hasPreloader := composed.Preloader()
+	if hasPreloader {
+		return d.createAggregateCursor(target, composed)
+	}
+
+	return d.createSimpleCursor(target, composed)
+}
+
+func (d *Database) createSimpleCursor(target interface{}, composed *query.Query) (cursor *mongox.Cursor, err error) {
+	collection, err := d.GetCollectionOf(target)
+	if err != nil {
+		return nil, err
+	}
+
+	opts := options.Find()
+	opts.Sort = composed.Sorter()
+	opts.Limit = composed.Limiter()
+	opts.Skip = composed.Skipper()
+
+	ctx := d.Context()
+	m := composed.M()
+
+	return collection.Find(ctx, m, opts)
+}
+
+func (d *Database) createAggregateCursor(target interface{}, composed *query.Query) (cursor *mongox.Cursor, err error) {
+	collection, err := d.GetCollectionOf(target)
+	if err != nil {
+		return nil, err
+	}
+
+	pipeline := primitive.A{}
+	if !composed.Empty() {
+		pipeline = append(pipeline, primitive.M{"$match": composed.M()})
+	}
+	if composed.Sorter() != nil {
+		pipeline = append(pipeline, primitive.M{"$sort": composed.Sorter()})
+	}
+	if composed.Skipper() != nil {
+		pipeline = append(pipeline, primitive.M{"$skip": *composed.Skipper()})
+	}
+	if composed.Limiter() != nil {
+		pipeline = append(pipeline, primitive.M{"$limit": *composed.Limiter()})
+	}
+
+	el := reflect.ValueOf(target)
+	elType := el.Type()
+	if elType.Kind() == reflect.Ptr {
+		elType = elType.Elem()
+	}
+
+	numField := elType.NumField()
+	preloads, _ := composed.Preloader()
+	for i := 0; i < numField; i++ {
+		field := elType.Field(i)
+		tag := field.Tag
+
+		preloadTag, ok := tag.Lookup("preload")
+		if !ok {
+			continue
+		}
+		jsonTag, _ := tag.Lookup("json")
+		if jsonTag == "-" {
+			return nil, fmt.Errorf("%w: private field is not preloadable", mongox.ErrMalformedBase)
+		}
+
+		jsonData := strings.SplitN(jsonTag, ",", 2)
+		jsonName := field.Name
+		if len(jsonData) > 0 {
+			jsonName = strings.TrimSpace(jsonData[0])
+		}
+
+		preloadData := strings.Split(preloadTag, ",")
+		if len(preloadData) == 0 {
+			continue
+		}
+		if len(preloadData) == 1 {
+			return nil, fmt.Errorf("%w: foreign field is not specified", mongox.ErrMalformedBase)
+		}
+
+		foreignField := strings.TrimSpace(preloadData[1])
+		if len(foreignField) == 0 {
+			return nil, fmt.Errorf("%w: foreign field is empty", mongox.ErrMalformedBase)
+		}
+		localField := strings.TrimSpace(preloadData[0])
+		if len(localField) == 0 {
+			localField = "_id"
+		}
+
+		preloadLimiter := 100
+		preloadReversed := false
+		if len(preloadData) > 2 {
+			stringLimit := strings.TrimSpace(preloadData[2])
+			intLimit := preloadLimiter
+
+			preloadReversed = strings.HasPrefix(stringLimit, "-")
+			if preloadReversed {
+				stringLimit = stringLimit[1:]
+			}
+
+			intLimit, err = strconv.Atoi(stringLimit)
+			if err == nil {
+				preloadLimiter = intLimit
+			} else {
+				return nil, fmt.Errorf("%w: preload limit should be an integer", mongox.ErrMalformedBase)
+			}
+		}
+
+		for _, preload := range preloads {
+			if preload != jsonName {
+				continue
+			}
+
+			field := elType.Field(i)
+			fieldType := field.Type
+
+			isSlice := fieldType.Kind() == reflect.Slice
+			if isSlice {
+				fieldType = fieldType.Elem()
+			}
+
+			isPtr := fieldType.Kind() != reflect.Ptr
+			if isPtr {
+				return nil, fmt.Errorf("%w: preload field should have ptr type", mongox.ErrMalformedBase)
+			}
+
+			lookupCollection, err := d.GetCollectionOf(reflect.Zero(fieldType).Interface())
+			if err != nil {
+				return nil, err
+			}
+
+			lookupVars := primitive.M{"selector": "$" + localField}
+			lookupPipeline := primitive.A{
+				primitive.M{"$match": primitive.M{"$expr": primitive.M{"$eq": primitive.A{"$" + foreignField, "$$selector"}}}},
+			}
+
+			if preloadReversed {
+				lookupPipeline = append(lookupPipeline, primitive.M{"$sort": primitive.M{"_id": -1}})
+			}
+			if isSlice && preloadLimiter > 0 {
+				lookupPipeline = append(lookupPipeline, primitive.M{"$limit": preloadLimiter})
+			} else if !isSlice {
+				lookupPipeline = append(lookupPipeline, primitive.M{"$limit": 1})
+			}
+
+			pipeline = append(pipeline, primitive.M{
+				"$lookup": primitive.M{
+					"from":     lookupCollection.Name(),
+					"let":      lookupVars,
+					"pipeline": lookupPipeline,
+					"as":       jsonName,
+				},
+			})
+
+			if isSlice {
+				continue
+			}
+
+			pipeline = append(pipeline, primitive.M{
+				"$unwind": primitive.M{
+					"preserveNullAndEmptyArrays": true,
+					"path":                       "$" + jsonName,
+				},
+			})
+		}
+	}
+
+	ctx := d.Context()
+	opts := options.Aggregate()
+
+	return collection.Aggregate(ctx, pipeline, opts)
+}

mongox/database/database.go

@@ -2,238 +2,70 @@ package database
 
 import (
 	"context"
-	"fmt"
 	"reflect"
-	"strconv"
-	"strings"
-
-	"go.mongodb.org/mongo-driver/bson/primitive"
-	"go.mongodb.org/mongo-driver/mongo/options"
 
 	"github.com/mainnika/mongox-go-driver/v2/mongox"
-	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
 )
 
 // Database handler
 type Database struct {
 	client *mongox.Client
-	dbname string
+	name   string
 	ctx    context.Context
 }
 
 // NewDatabase function creates new database instance with mongo client and empty context
-func NewDatabase(client *mongox.Client, dbname string) mongox.Database {
+func NewDatabase(ctx context.Context, client *mongox.Client, name string) (db mongox.Database) {
-
+	db = &Database{
-	db := &Database{}
+		client: client,
-	db.client = client
+		name:   name,
-	db.dbname = dbname
+		ctx:    ctx,
+	}
 
 	return db
 }
 
 // Client function returns a mongo client
-func (d *Database) Client() *mongox.Client {
+func (d *Database) Client() (client *mongox.Client) {
 	return d.client
 }
 
+// Name function returns a database name
+func (d *Database) Name() (name string) {
+	return d.name
+}
+
 // Context function returns a context
 func (d *Database) Context() (ctx context.Context) {
-
 	ctx = d.ctx
 	if ctx == nil {
 		ctx = context.Background()
 	}
 
-	return
+	return ctx
-}
-
-// Name function returns a database name
-func (d *Database) Name() string {
-	return d.dbname
-}
-
-// New function creates new database context with same client
-func (d *Database) New(ctx context.Context) mongox.Database {
-
-	if ctx == nil {
-		ctx = context.Background()
-	}
-
-	return &Database{
-		client: d.client,
-		dbname: d.dbname,
-		ctx:    ctx,
-	}
 }
 
 // GetCollectionOf returns the collection object by the «collection» tag of the given document;
-// the «collection» tag should exists, e.g.:
+//
-// type Foobar struct {
+//	 example:
-//     base.ObjectID `bson:",inline" json:",inline" collection:"foobars"`
+//		type Foobar struct {
-// 	   ...
+//		    base.ObjectID `bson:",inline" json:",inline" collection:"foobars"`
-// Will panic if there is no «collection» tag
+//			   ...
-func (d *Database) GetCollectionOf(document interface{}) *mongox.Collection {
+func (d *Database) GetCollectionOf(document interface{}) (collection *mongox.Collection, err error) {
-
 	el := reflect.TypeOf(document).Elem()
 	numField := el.NumField()
+	databaseName := d.name
 
 	for i := 0; i < numField; i++ {
 		field := el.Field(i)
 		tag := field.Tag
-		found, ok := tag.Lookup("collection")
+		collectionName, found := tag.Lookup("collection")
-		if !ok {
+		if !found {
 			continue
 		}
 
-		return d.client.Database(d.dbname).Collection(found)
+		return d.client.Database(databaseName).Collection(collectionName), nil
 	}
 
-	panic(fmt.Errorf("document %v does not have a collection tag", document))
+	return nil, mongox.ErrNoCollection
-}
-
-func (d *Database) createSimpleLoad(target interface{}, composed *query.Query) (cursor *mongox.Cursor, err error) {
-
-	collection := d.GetCollectionOf(target)
-	opts := options.Find()
-
-	opts.Sort = composed.Sorter()
-	opts.Limit = composed.Limiter()
-	opts.Skip = composed.Skipper()
-
-	return collection.Find(d.Context(), composed.M(), opts)
-}
-
-func (d *Database) createAggregateLoad(target interface{}, composed *query.Query) (cursor *mongox.Cursor, err error) {
-
-	collection := d.GetCollectionOf(target)
-	opts := options.Aggregate()
-
-	pipeline := primitive.A{}
-
-	if !composed.Empty() {
-		pipeline = append(pipeline, primitive.M{"$match": primitive.M{"$expr": composed.M()}})
-	}
-	if composed.Sorter() != nil {
-		pipeline = append(pipeline, primitive.M{"$sort": composed.Sorter()})
-	}
-	if composed.Skipper() != nil {
-		pipeline = append(pipeline, primitive.M{"$skip": *composed.Skipper()})
-	}
-	if composed.Limiter() != nil {
-		pipeline = append(pipeline, primitive.M{"$limit": *composed.Limiter()})
-	}
-
-	el := reflect.ValueOf(target).Elem()
-	elType := el.Type()
-	numField := elType.NumField()
-	_, preloads := composed.Preloader()
-
-	for i := 0; i < numField; i++ {
-
-		field := elType.Field(i)
-		tag := field.Tag
-
-		preloadTag, ok := tag.Lookup("preload")
-		if !ok {
-			continue
-		}
-		jsonTag, ok := tag.Lookup("json")
-		if jsonTag == "-" {
-			return nil, fmt.Errorf("preload private field is impossible")
-		}
-
-		jsonData := strings.SplitN(jsonTag, ",", 2)
-		jsonName := field.Name
-		if len(jsonData) > 0 {
-			jsonName = strings.TrimSpace(jsonData[0])
-		}
-
-		preloadData := strings.Split(preloadTag, ",")
-		if len(preloadData) == 0 {
-			continue
-		}
-		if len(preloadData) == 1 {
-			panic("there is no foreign field")
-		}
-
-		localField := strings.TrimSpace(preloadData[0])
-		if len(localField) == 0 {
-			localField = "_id"
-		}
-
-		foreignField := strings.TrimSpace(preloadData[1])
-		if len(foreignField) == 0 {
-			panic("there is no foreign field")
-		}
-
-		preloadLimiter := 100
-		preloadReversed := false
-		if len(preloadData) > 2 {
-			stringLimit := strings.TrimSpace(preloadData[2])
-			intLimit := preloadLimiter
-
-			preloadReversed = strings.HasPrefix(stringLimit, "-")
-			if preloadReversed {
-				stringLimit = stringLimit[1:]
-			}
-
-			intLimit, err = strconv.Atoi(stringLimit)
-			if err == nil {
-				preloadLimiter = intLimit
-			}
-		}
-
-		for _, preload := range preloads {
-			if preload != jsonName {
-				continue
-			}
-
-			isSlice := el.Field(i).Kind() == reflect.Slice
-
-			typ := el.Field(i).Type()
-			if typ.Kind() == reflect.Slice {
-				typ = typ.Elem()
-			}
-			if typ.Kind() != reflect.Ptr {
-				panic("preload field should have ptr type")
-			}
-
-			lookupCollection := d.GetCollectionOf(reflect.Zero(typ).Interface())
-			lookupVars := primitive.M{"selector": "$" + localField}
-			lookupPipeline := primitive.A{
-				primitive.M{"$match": primitive.M{"$expr": primitive.M{"$eq": primitive.A{"$" + foreignField, "$$selector"}}}},
-			}
-
-			if preloadReversed {
-				lookupPipeline = append(lookupPipeline, primitive.M{"$sort": primitive.M{"_id": -1}})
-			}
-			if isSlice && preloadLimiter > 0 {
-				lookupPipeline = append(lookupPipeline, primitive.M{"$limit": preloadLimiter})
-			} else if !isSlice {
-				lookupPipeline = append(lookupPipeline, primitive.M{"$limit": 1})
-			}
-
-			pipeline = append(pipeline, primitive.M{
-				"$lookup": primitive.M{
-					"from":     lookupCollection.Name(),
-					"let":      lookupVars,
-					"pipeline": lookupPipeline,
-					"as":       jsonName,
-				},
-			})
-
-			if isSlice {
-				continue
-			}
-
-			pipeline = append(pipeline, primitive.M{
-				"$unwind": primitive.M{
-					"preserveNullAndEmptyArrays": true,
-					"path":                       "$" + jsonName,
-				},
-			})
-		}
-	}
-
-	return collection.Aggregate(d.Context(), pipeline, opts)
 }

mongox/database/deletearray.go

@@ -8,11 +8,11 @@ import (
 	"go.mongodb.org/mongo-driver/mongo/options"
 
 	"github.com/mainnika/mongox-go-driver/v2/mongox/base"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
 )
 
 // DeleteArray removes documents list from a database by their ids
-func (d *Database) DeleteArray(target interface{}) error {
+func (d *Database) DeleteArray(target interface{}, filters ...interface{}) (err error) {
-
 	targetV := reflect.ValueOf(target)
 	targetT := targetV.Type()
 
@@ -34,25 +34,43 @@ func (d *Database) DeleteArray(target interface{}) error {
 
 	zeroElem := reflect.Zero(targetSliceElemT)
 	targetLen := targetSliceV.Len()
-	collection := d.GetCollectionOf(zeroElem.Interface())
-	opts := options.Delete()
-	ids := primitive.A{}
 
-	for i := 0; i < targetLen; i++ {
+	collection, err := d.GetCollectionOf(zeroElem.Interface())
-		elem := targetSliceV.Index(i)
-		ids = append(ids, base.GetID(elem.Interface()))
-	}
-
-	if len(ids) == 0 {
-		return fmt.Errorf("can't delete zero elements")
-	}
-
-	result, err := collection.DeleteMany(d.Context(), primitive.M{"_id": primitive.M{"$in": ids}}, opts)
 	if err != nil {
-		return fmt.Errorf("can't create find and delete result: %w", err)
+		return err
+	}
+
+	composed, err := query.Compose(filters...)
+	if err != nil {
+		return err
+	}
+
+	if targetLen > 0 {
+		var ids primitive.A
+		for i := 0; i < targetLen; i++ {
+			elem := targetSliceV.Index(i)
+			elemID, err := base.GetID(elem.Interface())
+			if err != nil {
+				return err
+			}
+
+			ids = append(ids, elemID)
+		}
+		composed.And(primitive.M{"_id": primitive.M{"$in": ids}})
+	}
+
+	ctx := query.WithContext(d.Context(), composed)
+	m := composed.M()
+	opts := options.Delete()
+
+	defer func() { _ = composed.OnClose().Invoke(ctx, target) }()
+
+	result, err := collection.DeleteMany(ctx, m, opts)
+	if err != nil {
+		return fmt.Errorf("while deleting array: %w", err)
 	}
 	if result.DeletedCount != int64(targetLen) {
-		return fmt.Errorf("can't verify delete result: removed count mismatch %d != %d", result.DeletedCount, targetLen)
+		return fmt.Errorf("deleted count mismatch %d != %d", result.DeletedCount, targetLen)
 	}
 
 	return nil

mongox/database/deleteone.go

@@ -2,49 +2,65 @@ package database
 
 import (
 	"fmt"
-	"time"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/protection"
 
+	"github.com/modern-go/reflect2"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 	"go.mongodb.org/mongo-driver/mongo/options"
 
-	"github.com/mainnika/mongox-go-driver/v2/mongox"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/base"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
-	"github.com/mainnika/mongox-go-driver/v2/mongox/utils"
 )
 
 // DeleteOne removes a document from a database and then returns it into target
-func (d *Database) DeleteOne(target interface{}, filters ...interface{}) error {
+func (d *Database) DeleteOne(target interface{}, filters ...interface{}) (err error) {
+	composed, err := query.Compose(filters...)
+	if err != nil {
+		return err
+	}
 
-	collection := d.GetCollectionOf(target)
+	collection, err := d.GetCollectionOf(target)
-	opts := &options.FindOneAndDeleteOptions{}
+	if err != nil {
-	composed := query.Compose(filters...)
+		return err
-	protected := base.GetProtection(target)
+	}
 
+	if !reflect2.IsNil(target) {
+		targetID, err := base.GetID(target)
+		if err != nil {
+			return err
+		}
+
+		composed.And(primitive.M{"_id": targetID})
+	}
+
+	protected := protection.Get(target)
+	if protected != nil {
+		_, err := query.Push(composed, protected)
+		if err != nil {
+			return err
+		}
+
+		protected.Restate()
+	}
+
+	ctx := query.WithContext(d.Context(), composed)
+	m := composed.M()
+	opts := options.FindOneAndDelete()
 	opts.Sort = composed.Sorter()
 
-	if !utils.IsNil(target) {
+	defer func() { _ = composed.OnClose().Invoke(ctx, target) }()
-		composed.And(primitive.M{"_id": base.GetID(target)})
-	}
 
-	if protected != nil {
+	result := collection.FindOneAndDelete(ctx, m, opts)
-		query.Push(composed, protected)
-		protected.X = primitive.NewObjectID()
-		protected.V = time.Now().Unix()
-	}
-
-	result := collection.FindOneAndDelete(d.Context(), composed.M(), opts)
 	if result.Err() != nil {
 		return fmt.Errorf("can't create find one and delete result: %w", result.Err())
 	}
 
-	err := result.Decode(target)
+	err = result.Decode(target)
-	if err == mongox.ErrNoDocuments {
-		return err
-	}
 	if err != nil {
-		return fmt.Errorf("can't decode result: %w", err)
+		return fmt.Errorf("can't decode find one and delete result: %w", err)
 	}
 
+	_ = composed.OnDecode().Invoke(ctx, target)
+
 	return nil
 }

mongox/database/index.go

@@ -14,18 +14,21 @@ import (
 )
 
 // IndexEnsure function ensures index in mongo collection of document
-//   `index:""` -- https://docs.mongodb.com/manual/indexes/#create-an-index
+//
-//   `index:"-"` -- (descending)
+//	`index:""` -- https://docs.mongodb.com/manual/indexes/#create-an-index
-//   `index:"-,+foo,+-bar"` -- https://docs.mongodb.com/manual/core/index-compound
+//	`index:"-"` -- (descending)
-//   `index:"-,+foo,+-bar,unique"` -- https://docs.mongodb.com/manual/core/index-unique
+//	`index:"-,+foo,+-bar"` -- https://docs.mongodb.com/manual/core/index-compound
-//   `index:"-,+foo,+-bar,unique,allowNull"` -- https://docs.mongodb.com/manual/core/index-partial
+//	`index:"-,+foo,+-bar,unique"` -- https://docs.mongodb.com/manual/core/index-unique
-//   `index:"-,unique,allowNull,expireAfter=86400"` -- https://docs.mongodb.com/manual/core/index-ttl
+//	`index:"-,+foo,+-bar,unique,allowNull"` -- https://docs.mongodb.com/manual/core/index-partial
-//   `index:"-,unique,allowNull,expireAfter={{.Expire}}"` -- evaluate index as a golang template with `cfg` arguments
+//	`index:"-,unique,allowNull,expireAfter=86400"` -- https://docs.mongodb.com/manual/core/index-ttl
-func (d *Database) IndexEnsure(cfg interface{}, document interface{}) error {
+//	`index:"-,unique,allowNull,expireAfter={{.Expire}}"` -- evaluate index as a golang template with `cfg` arguments
-
+func (d *Database) IndexEnsure(cfg interface{}, document interface{}) (err error) {
 	el := reflect.ValueOf(document).Elem().Type()
 	numField := el.NumField()
-	documents := d.GetCollectionOf(document)
+	collection, err := d.GetCollectionOf(document)
+	if err != nil {
+		return err
+	}
 
 	for i := 0; i < numField; i++ {
 
@@ -41,14 +44,16 @@ func (d *Database) IndexEnsure(cfg interface{}, document interface{}) error {
 			return fmt.Errorf("bson tag is not defined for field:%v document:%v", field, document)
 		}
 
-		tmpBuffer := &bytes.Buffer{}
+		var tmpBuffer = &bytes.Buffer{}
-		tpl, err := template.New("").Parse(indexTag)
+		var tpl *template.Template
+
+		tpl, err = template.New("").Parse(indexTag)
 		if err != nil {
-			panic(fmt.Errorf("invalid prop template, %v", indexTag))
+			panic(fmt.Errorf("invalid prop template %v, err:%w", indexTag, err))
 		}
 		err = tpl.Execute(tmpBuffer, cfg)
 		if err != nil {
-			panic(fmt.Errorf("failed to evaluate prop template, %v", indexTag))
+			panic(fmt.Errorf("failed to evaluate prop template %v, err:%w", indexTag, err))
 		}
 
 		indexString := tmpBuffer.String()
@@ -64,15 +69,15 @@ func (d *Database) IndexEnsure(cfg interface{}, document interface{}) error {
 			panic(fmt.Errorf("cannot evaluate index key"))
 		}
 
-		index := primitive.M{key: 1}
 		opts := &options.IndexOptions{
 			Background: &f,
 			Unique:     &f,
 			Name:       &name,
 		}
 
+		index := primitive.D{{Key: key, Value: 1}}
 		if indexValues[0] == "-" {
-			index[key] = -1
+			index = primitive.D{{Key: key, Value: -1}}
 		}
 
 		for _, prop := range indexValues[1:] {
@@ -114,9 +119,9 @@ func (d *Database) IndexEnsure(cfg interface{}, document interface{}) error {
 				}
 
 				if compoundValue[0] == '-' {
-					index[compoundValue[1:]] = -1
+					index = append(index, primitive.E{compoundValue[1:], -1})
 				} else {
-					index[compoundValue] = 1
+					index = append(index, primitive.E{compoundValue, 1})
 				}
 
 			default:
@@ -124,11 +129,11 @@ func (d *Database) IndexEnsure(cfg interface{}, document interface{}) error {
 			}
 		}
 
-		_, err = documents.Indexes().CreateOne(d.Context(), mongo.IndexModel{Keys: index, Options: opts})
+		_, err = collection.Indexes().CreateOne(d.Context(), mongo.IndexModel{Keys: index, Options: opts})
 		if err != nil {
-			return err
+			return
 		}
 	}
 
-	return nil
+	return
 }

mongox/database/index_test.go

@@ -1,6 +1,7 @@
 package database_test
 
 import (
+	"github.com/stretchr/testify/require"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -11,7 +12,7 @@ import (
 
 func TestDatabase_Ensure(t *testing.T) {
 
-	db, err := database.NewEphemeral("mongodb://localhost")
+	db, err := database.NewEphemeral("")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -142,7 +143,10 @@ func TestDatabase_Ensure(t *testing.T) {
 		err = db.IndexEnsure(tt.settings, tt.doc)
 		assert.NoError(t, err)
 
-		indexes, _ := db.GetCollectionOf(tt.doc).Indexes().List(db.Context())
+		collection, err := db.GetCollectionOf(tt.doc)
+		require.NoError(t, err)
+
+		indexes, _ := collection.Indexes().List(db.Context())
 		index := new(map[string]interface{})
 
 		indexes.Next(db.Context()) // skip _id_

mongox/database/loadarray.go

@@ -4,14 +4,12 @@ import (
 	"fmt"
 	"reflect"
 
-	"github.com/mainnika/mongox-go-driver/v2/mongox"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/base"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
 )
 
 // LoadArray loads an array of documents from the database by query
-func (d *Database) LoadArray(target interface{}, filters ...interface{}) error {
+func (d *Database) LoadArray(target interface{}, filters ...interface{}) (err error) {
-
 	targetV := reflect.ValueOf(target)
 	targetT := targetV.Type()
 
@@ -31,45 +29,61 @@ func (d *Database) LoadArray(target interface{}, filters ...interface{}) error {
 		panic(fmt.Errorf("target slice should contain ptrs"))
 	}
 
-	composed := query.Compose(filters...)
 	zeroElem := reflect.Zero(targetSliceElemT)
-	hasPreloader, _ := composed.Preloader()
 
-	var result *mongox.Cursor
+	composed, err := query.Compose(filters...)
-	var err error
+	if err != nil {
-
+		return err
-	if hasPreloader {
-		result, err = d.createAggregateLoad(zeroElem.Interface(), composed)
-	} else {
-		result, err = d.createSimpleLoad(zeroElem.Interface(), composed)
 	}
+
+	ctx := query.WithContext(d.Context(), composed)
+
+	defer func() { _ = composed.OnClose().Invoke(ctx, target) }()
+
+	cur, err := d.createCursor(zeroElem.Interface(), composed)
 	if err != nil {
 		return fmt.Errorf("can't create find result: %w", err)
 	}
 
-	var i int
+	defer func() { _ = cur.Close(ctx) }()
 
-	for i = 0; result.Next(d.Context()); {
+	var i int
-		if targetSliceV.Len() == i {
+	for i = 0; cur.Next(ctx); i++ {
-			elem := reflect.New(targetSliceElemT.Elem())
+		var elem interface{}
-			if err = result.Decode(elem.Interface()); err == nil {
+		if i == targetSliceV.Len() {
-				targetSliceV = reflect.Append(targetSliceV, elem)
+			value := reflect.New(targetSliceElemT.Elem())
-			} else {
+			elem = value.Interface()
-				continue
+
+			_ = composed.OnCreate().Invoke(ctx, elem)
+
+			err = cur.Decode(elem)
+			if err != nil {
+				return err
 			}
+
+			targetSliceV = reflect.Append(targetSliceV, value)
 		} else {
-			elem := targetSliceV.Index(i).Interface()
+			elem = targetSliceV.Index(i).Interface()
-			base.Reset(elem)
+
-			if err = result.Decode(elem); err != nil {
+			if created := base.Reset(elem); created {
-				continue
+				_ = composed.OnCreate().Invoke(ctx, elem)
+			}
+
+			err = cur.Decode(elem)
+			if err != nil {
+				return err
 			}
 		}
 
-		i++
+		_ = composed.OnDecode().Invoke(ctx, elem)
+	}
+	err = cur.Err()
+	if err != nil {
+		return err
 	}
 
 	targetSliceV = targetSliceV.Slice(0, i)
 	targetV.Elem().Set(targetSliceV)
 
-	return result.Close(d.Context())
+	return nil
 }

mongox/database/loadone.go

@@ -1,40 +1,46 @@
 package database
 
 import (
-	"fmt"
-
 	"github.com/mainnika/mongox-go-driver/v2/mongox"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/base"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
 )
 
 // LoadOne function loads a first single target document by a query
-func (d *Database) LoadOne(target interface{}, filters ...interface{}) error {
+func (d *Database) LoadOne(target interface{}, filters ...interface{}) (err error) {
-
+	composed, err := query.Compose(append(filters, query.Limit(1))...)
-	composed := query.Compose(append(filters, query.Limit(1))...)
-	hasPreloader, _ := composed.Preloader()
-
-	var result *mongox.Cursor
-	var err error
-
-	if hasPreloader {
-		result, err = d.createAggregateLoad(target, composed)
-	} else {
-		result, err = d.createSimpleLoad(target, composed)
-	}
 	if err != nil {
-		return fmt.Errorf("can't create find result: %w", err)
+		return err
 	}
 
-	hasNext := result.Next(d.Context())
+	ctx := query.WithContext(d.Context(), composed)
-	if result.Err() != nil {
+
+	defer func() { _ = composed.OnClose().Invoke(ctx, target) }()
+
+	cur, err := d.createCursor(target, composed)
+	if err != nil {
 		return err
 	}
+	defer func() { _ = cur.Close(ctx) }()
+
+	hasNext := cur.Next(ctx)
+	if cur.Err() != nil {
+		return cur.Err()
+	}
 	if !hasNext {
 		return mongox.ErrNoDocuments
 	}
 
-	base.Reset(target)
+	if created := base.Reset(target); created {
+		_ = composed.OnCreate().Invoke(ctx, target)
+	}
 
-	return result.Decode(target)
+	err = cur.Decode(target)
+	if err != nil {
+		return err
+	}
+
+	_ = composed.OnDecode().Invoke(ctx, target)
+
+	return nil
 }

mongox/database/loadstream.go

@@ -1,31 +1,25 @@
 package database
 
 import (
-	"fmt"
-
 	"github.com/mainnika/mongox-go-driver/v2/mongox"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
 )
 
 // LoadStream function loads documents one by one into a target channel
-func (d *Database) LoadStream(target interface{}, filters ...interface{}) (mongox.StreamLoader, error) {
+func (d *Database) LoadStream(target interface{}, filters ...interface{}) (loader mongox.StreamLoader, err error) {
-
+	composed, err := query.Compose(filters...)
-	var cursor *mongox.Cursor
-	var err error
-
-	composed := query.Compose(filters...)
-	hasPreloader, _ := composed.Preloader()
-
-	if hasPreloader {
-		cursor, err = d.createAggregateLoad(target, composed)
-	} else {
-		cursor, err = d.createSimpleLoad(target, composed)
-	}
 	if err != nil {
-		return nil, fmt.Errorf("can't create find result: %w", err)
+		return
 	}
 
-	l := &StreamLoader{cur: cursor, ctx: d.Context(), target: target}
+	ctx := query.WithContext(d.Context(), composed)
 
-	return l, nil
+	cur, err := d.createCursor(target, composed)
+	if err != nil {
+		return nil, err
+	}
+
+	loader = &StreamLoader{cur: cur, ctx: ctx, query: composed}
+
+	return loader, nil
 }

mongox/database/saveone.go

@@ -1,9 +1,7 @@
 package database
 
 import (
-	"time"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/protection"
-
-	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 	"go.mongodb.org/mongo-driver/mongo/options"
 
@@ -12,27 +10,51 @@ import (
 )
 
 // SaveOne saves a single source document to the database
-func (d *Database) SaveOne(source interface{}) error {
+func (d *Database) SaveOne(source interface{}, filters ...interface{}) (err error) {
+	collection, err := d.GetCollectionOf(source)
+	if err != nil {
+		return err
+	}
 
-	collection := d.GetCollectionOf(source)
+	composed, err := query.Compose(filters...)
+	if err != nil {
+		return err
+	}
+
+	id, err := base.GetID(source)
+	if err != nil {
+		return err
+	}
+	composed.And(primitive.M{"_id": id})
+
+	protected := protection.Get(source)
+	if protected != nil {
+		query.Push(composed, protected)
+		protected.Restate()
+	}
+
+	ctx := query.WithContext(d.Context(), composed)
+	m := composed.M()
 	opts := options.FindOneAndReplace()
-	id := base.GetID(source)
-	protected := base.GetProtection(source)
-	composed := query.Compose(bson.M{"_id": id})
-
 	opts.SetUpsert(true)
 	opts.SetReturnDocument(options.After)
 
-	if protected != nil {
+	defer func() { _ = composed.OnClose().Invoke(ctx, source) }()
-		query.Push(composed, protected)
-		protected.X = primitive.NewObjectID()
-		protected.V = time.Now().Unix()
-	}
 
-	result := collection.FindOneAndReplace(d.Context(), composed.M(), source, opts)
+	result := collection.FindOneAndReplace(ctx, m, source, opts)
 	if result.Err() != nil {
 		return result.Err()
 	}
 
-	return result.Decode(source)
+	err = result.Decode(source)
+	if err != nil {
+		return
+	}
+
+	err = composed.OnDecode().Invoke(ctx, source)
+	if err != nil {
+		return
+	}
+
+	return
 }

mongox/database/streamloader.go

@@ -2,61 +2,59 @@ package database
 
 import (
 	"context"
-	"fmt"
 
 	"github.com/mainnika/mongox-go-driver/v2/mongox"
 	"github.com/mainnika/mongox-go-driver/v2/mongox/base"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
 )
 
 // StreamLoader is a controller for a database cursor
 type StreamLoader struct {
-	cur    *mongox.Cursor
+	cur   *mongox.Cursor
-	ctx    context.Context
+	query *query.Query
-	target interface{}
+	ctx   context.Context
 }
 
-// DecodeNext loads next documents to a target or returns an error
+// DecodeNextMsg decodes the next document to an interface or returns an error
-func (l *StreamLoader) DecodeNext() error {
+func (l *StreamLoader) DecodeNextMsg(i interface{}) (err error) {
-
+	err = l.Next()
-	hasNext := l.cur.Next(l.ctx)
-
-	if l.cur.Err() != nil {
-		return l.cur.Err()
-	}
-	if !hasNext {
-		return mongox.ErrNoDocuments
-	}
-
-	base.Reset(l.target)
-
-	err := l.cur.Decode(l.target)
 	if err != nil {
-		return fmt.Errorf("can't decode desult: %w", err)
+		return
 	}
 
-	return nil
+	err = l.DecodeMsg(i)
+	if err != nil {
+		return
+	}
+
+	return
 }
 
-// Decode function decodes the current cursor document into the target
+// DecodeMsg decodes the current cursor document into an interface
-func (l *StreamLoader) Decode() error {
+func (l *StreamLoader) DecodeMsg(i interface{}) (err error) {
-
+	if created := base.Reset(i); created {
-	base.Reset(l.target)
+		_ = l.query.OnDecode().Invoke(l.ctx, i)
-
-	err := l.cur.Decode(l.target)
-	if err != nil {
-		return fmt.Errorf("can't decode desult: %w", err)
 	}
+	if err != nil {
+		return err
+	}
+
+	err = l.cur.Decode(i)
+	if err != nil {
+		return err
+	}
+
+	_ = l.query.OnDecode().Invoke(l.ctx, i)
 
 	return nil
 }
 
 // Next loads next documents but doesn't perform decoding
-func (l *StreamLoader) Next() error {
+func (l *StreamLoader) Next() (err error) {
-
 	hasNext := l.cur.Next(l.ctx)
-
+	err = l.cur.Err()
-	if l.cur.Err() != nil {
+	if err != nil {
-		return l.cur.Err()
+		return err
 	}
 	if !hasNext {
 		return mongox.ErrNoDocuments
@@ -65,15 +63,28 @@ func (l *StreamLoader) Next() error {
 	return nil
 }
 
-func (l *StreamLoader) Cursor() *mongox.Cursor {
+// Cursor returns the underlying cursor
+func (l *StreamLoader) Cursor() (cursor *mongox.Cursor) {
 	return l.cur
 }
 
-// Close cursor
+// Close stream loader and the underlying cursor
-func (l *StreamLoader) Close() error {
+func (l *StreamLoader) Close() (err error) {
-	return l.cur.Close(l.ctx)
+	defer func() { _ = l.query.OnClose().Invoke(l.ctx, nil) }()
+
+	err = l.cur.Close(l.ctx)
+	if err != nil {
+		return err
+	}
+
+	return nil
 }
 
-func (l *StreamLoader) Err() error {
+// Err returns the last error
+func (l *StreamLoader) Err() (err error) {
 	return l.cur.Err()
 }
+
+func (l *StreamLoader) Context() (ctx context.Context) {
+	return l.ctx
+}

mongox/database/updateone.go

@@ -0,0 +1,64 @@
+package database
+
+import (
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/protection"
+	"github.com/modern-go/reflect2"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo/options"
+
+	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
+)
+
+// UpdateOne updates a single document in the database and loads it into target
+func (d *Database) UpdateOne(target interface{}, filters ...interface{}) (err error) {
+	composed, err := query.Compose(filters...)
+	if err != nil {
+		return err
+	}
+
+	update, err := composed.Updater()
+	if err != nil {
+		return err
+	}
+
+	protected := protection.Get(target)
+	if protected != nil {
+		if !protected.X.IsZero() {
+			query.Push(composed, protected)
+		}
+		protected.Restate()
+
+		setCmd, _ := update["$set"].(primitive.M)
+		if reflect2.IsNil(setCmd) {
+			setCmd = primitive.M{}
+		}
+		protected.Inject(setCmd)
+		update["$set"] = setCmd
+	}
+
+	collection, err := d.GetCollectionOf(target)
+	if err != nil {
+		return err
+	}
+
+	ctx := query.WithContext(d.Context(), composed)
+	m := composed.M()
+	opts := options.FindOneAndUpdate()
+	opts.SetReturnDocument(options.After)
+
+	defer func() { _ = composed.OnClose().Invoke(ctx, target) }()
+
+	result := collection.FindOneAndUpdate(ctx, m, update, opts)
+	if result.Err() != nil {
+		return result.Err()
+	}
+
+	err = result.Decode(target)
+	if err != nil {
+		return err
+	}
+
+	_ = composed.OnDecode().Invoke(ctx, target)
+
+	return nil
+}

mongox/errors.go

@@ -1,6 +1,8 @@
 package mongox
 
 import (
+	"errors"
+
 	"go.mongodb.org/mongo-driver/mongo"
 )
 
@@ -18,3 +20,9 @@ var (
 	ErrWrongClient         = mongo.ErrWrongClient
 	ErrNoDocuments         = mongo.ErrNoDocuments
 )
+
+var (
+	ErrMalformedBase     = errors.New("source contains malformed document base")
+	ErrUninitializedBase = errors.New("uninitialized document")
+	ErrNoCollection      = errors.New("no collection found")
+)

mongox/mongox.go

@@ -16,51 +16,51 @@ type (
 
 // Database is the mongox database interface
 type Database interface {
-	Client() *Client
+	Client() (client *Client)
-	Context() context.Context
+	Context() (context context.Context)
-	Name() string
+	Name() (name string)
-	New(ctx context.Context) Database
+	GetCollectionOf(document interface{}) (collection *Collection, err error)
-	GetCollectionOf(document interface{}) *Collection
+	Count(target interface{}, filters ...interface{}) (count int64, err error)
-	Count(target interface{}, filters ...interface{}) (int64, error)
+	DeleteArray(target interface{}, filters ...interface{}) (err error)
-	DeleteArray(target interface{}) error
+	DeleteOne(target interface{}, filters ...interface{}) (err error)
-	DeleteOne(target interface{}, filters ...interface{}) error
+	LoadArray(target interface{}, filters ...interface{}) (err error)
-	LoadArray(target interface{}, filters ...interface{}) error
+	LoadOne(target interface{}, filters ...interface{}) (err error)
-	LoadOne(target interface{}, filters ...interface{}) error
+	LoadStream(target interface{}, filters ...interface{}) (loader StreamLoader, err error)
-	LoadStream(target interface{}, filters ...interface{}) (StreamLoader, error)
+	SaveOne(source interface{}, filters ...interface{}) (err error)
-	SaveOne(source interface{}) error
+	UpdateOne(target interface{}, filters ...interface{}) (err error)
-	IndexEnsure(cfg interface{}, document interface{}) error
+	IndexEnsure(cfg interface{}, document interface{}) (err error)
 }
 
 // StreamLoader is a interface to control database cursor
 type StreamLoader interface {
-	Cursor() *Cursor
+	Cursor() (cursor *Cursor)
-	DecodeNext() error
+	DecodeNextMsg(i interface{}) (err error)
-	Decode() error
+	DecodeMsg(i interface{}) (err error)
-	Next() error
+	Next() (err error)
-	Close() error
+	Close() (err error)
-	Err() error
+	Err() (err error)
 }
 
 // OIDBased is an interface for documents that have objectId type for the _id field
 type OIDBased interface {
-	GetID() primitive.ObjectID
+	GetID() (id primitive.ObjectID)
 	SetID(id primitive.ObjectID)
 }
 
 // StringBased is an interface for documents that have string type for the _id field
 type StringBased interface {
-	GetID() string
+	GetID() (id string)
 	SetID(id string)
 }
 
-// JSONBased is an interface for documents that have object type for the _id field
+// DocBased is an interface for documents that have object type for the _id field
-type JSONBased interface {
+type DocBased interface {
-	GetID() primitive.D
+	GetID() (id primitive.D)
 	SetID(id primitive.D)
 }
 
 // InterfaceBased is an interface for documents that have custom declated type for the _id field
 type InterfaceBased interface {
-	GetID() interface{}
+	GetID() (id interface{})
 	SetID(id interface{})
 }

mongox/query/callbacks.go

@@ -0,0 +1,26 @@
+package query
+
+import (
+	"context"
+)
+
+type Callback func(ctx context.Context, iter interface{}) (err error)
+type Callbacks []Callback
+
+type (
+	OnDecode Callback
+	OnClose  Callback
+)
+
+// Invoke callbacks sequence
+func (c Callbacks) Invoke(ctx context.Context, iter interface{}) (err error) {
+
+	for _, cb := range c {
+		err = cb(ctx, iter)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

mongox/query/callbacks_test.go

@@ -0,0 +1,58 @@
+package query_test
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
+
+	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
+)
+
+func TestCallbacks_InvokeOk(t *testing.T) {
+
+	mocked := mock.Mock{}
+
+	var callbacks = query.Callbacks{
+		func(ctx context.Context, iter interface{}) (err error) {
+			return mocked.Called(ctx, iter).Error(0)
+		},
+		func(ctx context.Context, iter interface{}) (err error) {
+			return mocked.Called(ctx, iter).Error(0)
+		},
+	}
+
+	ctx := context.Background()
+	iter := int64(42)
+
+	mocked.On("func1", ctx, iter).Return(nil).Once()
+	mocked.On("func2", ctx, iter).Return(nil).Once()
+
+	assert.NoError(t, callbacks.Invoke(ctx, iter))
+	assert.True(t, mocked.AssertExpectations(t))
+}
+
+func TestCallbacks_InvokeStopIfError(t *testing.T) {
+
+	mocked := mock.Mock{}
+
+	var callbacks = query.Callbacks{
+		func(ctx context.Context, iter interface{}) (err error) {
+			return mocked.Called(ctx, iter).Error(0)
+		},
+		func(ctx context.Context, iter interface{}) (err error) {
+			t.FailNow()
+			return
+		},
+	}
+
+	ctx := context.Background()
+	iter := int(42)
+
+	mocked.On("func1", ctx, iter).Return(fmt.Errorf("wat"))
+
+	assert.EqualError(t, callbacks.Invoke(ctx, iter), "wat")
+	assert.True(t, mocked.AssertExpectations(t))
+}

mongox/query/compose.go

@@ -3,50 +3,66 @@ package query
 import (
 	"fmt"
 
-	"go.mongodb.org/mongo-driver/bson"
+	"github.com/modern-go/reflect2"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 
 	"github.com/mainnika/mongox-go-driver/v2/mongox/base/protection"
-	"github.com/mainnika/mongox-go-driver/v2/mongox/utils"
 )
 
+type applyFilterFunc func(query *Query, filter interface{}) (ok bool)
+
 // Compose is a function to compose filters into a single query
-func Compose(filters ...interface{}) *Query {
+func Compose(filters ...interface{}) (query *Query, err error) {
-
+	query = &Query{}
-	q := &Query{}
+	for _, filter := range filters {
-
+		ok, err := Push(query, filter)
-	for _, f := range filters {
+		if err != nil {
-		if !Push(q, f) {
+			return nil, fmt.Errorf("invalid filter %v, %w", filter, err)
-			panic(fmt.Errorf("unknown filter %v", f))
+		}
+		if !ok {
+			panic(fmt.Errorf("unknown filter %v", filter))
 		}
 	}
 
-	return q
+	return query, nil
 }
 
 // Push applies single filter to a query
-func Push(q *Query, f interface{}) bool {
+func Push(query *Query, filter interface{}) (ok bool, err error) {
-
+	emptyFilter := reflect2.IsNil(filter)
-	if utils.IsNil(f) {
+	if emptyFilter {
-		return true
+		return true, nil
 	}
 
-	ok := false
+	validator, hasValidator := filter.(Validator)
-	ok = ok || applyBson(q, f)
+	if hasValidator {
-	ok = ok || applyLimit(q, f)
+		err := validator.Validate()
-	ok = ok || applySort(q, f)
+		if err != nil {
-	ok = ok || applySkip(q, f)
+			return false, fmt.Errorf("while validating filter %v, %w", filter, err)
-	ok = ok || applyProtection(q, f)
+		}
-	ok = ok || applyPreloader(q, f)
+	}
 
-	return ok
+	ok = false // true if at least one filter was applied
+	for _, applier := range []applyFilterFunc{
+		applyBson,
+		applyLimit,
+		applySort,
+		applySkip,
+		applyProtection,
+		applyPreloader,
+		applyUpdater,
+		applyCallbacks,
+	} {
+		ok = applier(query, filter) || ok
+	}
+
+	return ok, nil
 }
 
-// applyBson is a fallback for a custom bson.M
+// applyBson is a fallback for a custom primitive.M
-func applyBson(q *Query, f interface{}) bool {
+func applyBson(query *Query, filter interface{}) (ok bool) {
-
+	if filter, ok := filter.(primitive.M); ok {
-	if f, ok := f.(bson.M); ok {
+		query.And(filter)
-		q.And(f)
 		return true
 	}
 
@@ -54,10 +70,9 @@ func applyBson(q *Query, f interface{}) bool {
 }
 
 // applyLimits extends query with a limiter
-func applyLimit(q *Query, f interface{}) bool {
+func applyLimit(query *Query, filter interface{}) (ok bool) {
-
+	if filter, ok := filter.(Limiter); ok {
-	if f, ok := f.(Limiter); ok {
+		query.limiter = filter
-		q.limiter = f
 		return true
 	}
 
@@ -65,10 +80,9 @@ func applyLimit(q *Query, f interface{}) bool {
 }
 
 // applySort extends query with a sort rule
-func applySort(q *Query, f interface{}) bool {
+func applySort(query *Query, filter interface{}) (ok bool) {
-
+	if filter, ok := filter.(Sorter); ok {
-	if f, ok := f.(Sorter); ok {
+		query.sorter = filter
-		q.sorter = f
 		return true
 	}
 
@@ -76,50 +90,58 @@ func applySort(q *Query, f interface{}) bool {
 }
 
 // applySkip extends query with a skip number
-func applySkip(q *Query, f interface{}) bool {
+func applySkip(query *Query, filter interface{}) (ok bool) {
-
+	if filter, ok := filter.(Skipper); ok {
-	if f, ok := f.(Skipper); ok {
+		query.skipper = filter
-		q.skipper = f
 		return true
 	}
 
 	return false
 }
 
-func applyProtection(q *Query, f interface{}) bool {
+func applyProtection(query *Query, filter interface{}) (ok bool) {
-
+	keyDoc := primitive.M{}
-	var x *primitive.ObjectID
+	switch filter := filter.(type) {
-	var v *int64
-
-	switch f := f.(type) {
 	case protection.Key:
-		x = &f.X
+		filter.Inject(keyDoc)
-		v = &f.V
 	case *protection.Key:
-		x = &f.X
+		filter.Inject(keyDoc)
-		v = &f.V
-
 	default:
 		return false
 	}
 
-	if x.IsZero() {
+	query.And(keyDoc)
-		q.And(primitive.M{"_x": primitive.M{"$exists": false}})
-		q.And(primitive.M{"_v": primitive.M{"$exists": false}})
-	} else {
-		q.And(primitive.M{"_x": *x})
-		q.And(primitive.M{"_v": *v})
-	}
 
 	return true
 }
 
-func applyPreloader(q *Query, f interface{}) bool {
+func applyPreloader(query *Query, filter interface{}) (ok bool) {
-
+	if filter, ok := filter.(Preloader); ok {
-	if f, ok := f.(Preloader); ok {
+		query.preloader = filter
-		q.preloader = f
 		return true
 	}
 
 	return false
 }
+
+func applyUpdater(query *Query, filter interface{}) (ok bool) {
+	if filter, ok := filter.(Updater); ok {
+		query.updater = filter
+		return true
+	}
+
+	return false
+}
+
+func applyCallbacks(query *Query, filter interface{}) (ok bool) {
+	switch callback := filter.(type) {
+	case OnDecode:
+		query.onDecode = append(query.onDecode, Callback(callback))
+	case OnClose:
+		query.onClose = append(query.onClose, Callback(callback))
+	default:
+		return false
+	}
+
+	return true
+}

mongox/query/compose_test.go

@@ -0,0 +1,128 @@
+package query_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+
+	"github.com/mainnika/mongox-go-driver/v2/mongox/base/protection"
+	"github.com/mainnika/mongox-go-driver/v2/mongox/query"
+)
+
+func TestPushBSON(t *testing.T) {
+
+	q := &query.Query{}
+
+	ok, err := query.Push(q, primitive.M{"foo": "bar"})
+
+	assert.True(t, ok)
+	assert.NoError(t, err)
+	assert.NotEmpty(t, q.M())
+	assert.Len(t, q.M()["$and"], 1)
+	assert.Contains(t, q.M()["$and"], primitive.M{"foo": "bar"})
+
+	ok, err = query.Push(q, primitive.M{"bar": "foo"})
+
+	assert.True(t, ok)
+	assert.NoError(t, err)
+	assert.NotEmpty(t, q.M())
+	assert.Len(t, q.M()["$and"], 2)
+	assert.Contains(t, q.M()["$and"], primitive.M{"foo": "bar"})
+	assert.Contains(t, q.M()["$and"], primitive.M{"bar": "foo"})
+}
+
+func TestPushLimiter(t *testing.T) {
+
+	q := &query.Query{}
+	lim := query.Limit(2)
+
+	ok, err := query.Push(q, lim)
+
+	assert.True(t, ok)
+	assert.NoError(t, err)
+	assert.NotNil(t, q.Limiter())
+	assert.EqualValues(t, q.Limiter(), query.Limit(2).Limit())
+}
+
+func TestPushSorter(t *testing.T) {
+
+	q := &query.Query{}
+	sort := query.Sort{"foo": 1}
+
+	ok, err := query.Push(q, sort)
+
+	assert.True(t, ok)
+	assert.NoError(t, err)
+	assert.NotNil(t, q.Sorter())
+	assert.EqualValues(t, q.Sorter(), primitive.M{"foo": 1})
+}
+
+func TestPushSkipper(t *testing.T) {
+
+	q := &query.Query{}
+	skip := query.Skip(66)
+
+	ok, err := query.Push(q, skip)
+
+	assert.True(t, ok)
+	assert.NoError(t, err)
+	assert.NotNil(t, q.Skipper())
+	assert.EqualValues(t, q.Skipper(), query.Skip(66).Skip())
+}
+
+func TestPushProtection(t *testing.T) {
+
+	t.Run("push protection key pointer", func(t *testing.T) {
+		q := &query.Query{}
+		protected := &protection.Key{V: 1, X: primitive.ObjectID{2}}
+
+		ok, err := query.Push(q, protected)
+
+		assert.True(t, ok)
+		assert.NoError(t, err)
+		assert.NotEmpty(t, q.M()["$and"])
+		assert.Contains(t, q.M()["$and"], primitive.M{"_x": primitive.ObjectID{2}, "_v": int64(1)})
+	})
+
+	t.Run("push protection key struct", func(t *testing.T) {
+		q := &query.Query{}
+		protected := protection.Key{V: 1, X: primitive.ObjectID{2}}
+
+		ok, err := query.Push(q, protected)
+
+		assert.True(t, ok)
+		assert.NoError(t, err)
+		assert.NotEmpty(t, q.M()["$and"])
+		assert.Contains(t, q.M()["$and"], primitive.M{"_x": primitive.ObjectID{2}, "_v": int64(1)})
+	})
+
+	t.Run("protection key is empty", func(t *testing.T) {
+		q := &query.Query{}
+		protected := &protection.Key{}
+
+		ok, err := query.Push(q, protected)
+
+		assert.True(t, ok)
+		assert.NoError(t, err)
+		assert.NotEmpty(t, q.M()["$and"])
+		assert.Contains(t, q.M()["$and"], primitive.M{"_x": primitive.M{"$exists": false}, "_v": primitive.M{"$exists": false}})
+	})
+}
+
+func TestPushPreloader(t *testing.T) {
+
+	q := &query.Query{}
+	preloader := query.Preload{"a", "b"}
+
+	ok, err := query.Push(q, preloader)
+
+	assert.True(t, ok)
+	assert.NoError(t, err)
+
+	p, hasPreloader := q.Preloader()
+
+	assert.NotNil(t, p)
+	assert.True(t, hasPreloader)
+	assert.EqualValues(t, p, query.Preload{"a", "b"})
+}

mongox/query/context.go

@@ -0,0 +1,22 @@
+package query
+
+import (
+	"context"
+)
+
+type ctxQueryKey struct{}
+
+// GetFromContext function extracts the request data from context
+func GetFromContext(ctx context.Context) (q *Query, ok bool) {
+	q, ok = ctx.Value(ctxQueryKey{}).(*Query)
+	if !ok {
+		return nil, false
+	}
+
+	return q, true
+}
+
+// WithContext function creates the new context with request data
+func WithContext(ctx context.Context, q *Query) (withQuery context.Context) {
+	return context.WithValue(ctx, ctxQueryKey{}, q)
+}

mongox/query/limit.go

@@ -2,7 +2,7 @@ package query
 
 // Limiter is a filter to limit the result
 type Limiter interface {
-	Limit() *int64
+	Limit() (limit *int64)
 }
 
 // Limit is a simple implementation of the Limiter filter
@@ -11,12 +11,13 @@ type Limit int64
 var _ Limiter = Limit(0)
 
 // Limit returns a limit
-func (l Limit) Limit() *int64 {
+func (l Limit) Limit() (limit *int64) {
-
+	if l <= 0 {
-	lim := int64(l)
-	if lim <= 0 {
 		return nil
 	}
 
-	return &lim
+	limit = new(int64)
+	*limit = int64(l)
+
+	return limit
 }

mongox/query/preload.go

@@ -1,16 +1,16 @@
 package query
 
-// Preloader is a filter to skip the result
+// Preloader is a filter to preload the result
 type Preloader interface {
-	Preload() []string
+	Preload() (preloads []string)
 }
 
-// Preload is a simple implementation of the Skipper filter
+// Preload is a simple implementation of the Preloader filter
 type Preload []string
 
 var _ Preloader = Preload{}
 
 // Preload returns a preload list
-func (l Preload) Preload() []string {
+func (l Preload) Preload() (preloads []string) {
 	return l
 }

mongox/query/query.go

@@ -1,42 +1,43 @@
 package query
 
 import (
+	"github.com/modern-go/reflect2"
+	"github.com/valyala/bytebufferpool"
 	"go.mongodb.org/mongo-driver/bson"
-
+	"go.mongodb.org/mongo-driver/bson/primitive"
-	"reflect"
 )
 
-// Query is an enchanched bson.M map
+// Query is an enchanched primitive.M map
 type Query struct {
-	m         bson.M
+	m         primitive.M
 	limiter   Limiter
 	sorter    Sorter
 	skipper   Skipper
 	preloader Preloader
+	updater   Updater
+	onDecode  Callbacks
+	onClose   Callbacks
+	onCreate  Callbacks
 }
 
 // And function pushes the elem query to the $and array of the query
-func (q *Query) And(elem bson.M) *Query {
+func (q *Query) And(elem primitive.M) (query *Query) {
-
 	if q.m == nil {
-		q.m = bson.M{}
+		q.m = primitive.M{}
 	}
 
-	queries, exists := q.m["$and"].(bson.A)
+	queries, exists := q.m["$and"].(primitive.A)
-
 	if !exists {
-		q.m["$and"] = bson.A{elem}
+		q.m["$and"] = primitive.A{elem}
 		return q
 	}
 
 	q.m["$and"] = append(queries, elem)
-
 	return q
 }
 
 // Limiter returns limiter value or nil
-func (q *Query) Limiter() *int64 {
+func (q *Query) Limiter() (limit *int64) {
-
 	if q.limiter == nil {
 		return nil
 	}
@@ -45,8 +46,7 @@ func (q *Query) Limiter() *int64 {
 }
 
 // Sorter is a sort rule for a query
-func (q *Query) Sorter() interface{} {
+func (q *Query) Sorter() (sort interface{}) {
-
 	if q.sorter == nil {
 		return nil
 	}
@@ -55,8 +55,7 @@ func (q *Query) Sorter() interface{} {
 }
 
 // Skipper is a skipper for a query
-func (q *Query) Skipper() *int64 {
+func (q *Query) Skipper() (skip *int64) {
-
 	if q.skipper == nil {
 		return nil
 	}
@@ -64,32 +63,72 @@ func (q *Query) Skipper() *int64 {
 	return q.skipper.Skip()
 }
 
+// Updater is an update command for a query
+func (q *Query) Updater() (update primitive.M, err error) {
+	if q.updater == nil {
+		return primitive.M{}, nil
+	}
+
+	update = q.updater.Update()
+	if reflect2.IsNil(update) {
+		return primitive.M{}, nil
+	}
+
+	buffer := bytebufferpool.Get()
+	defer bytebufferpool.Put(buffer)
+
+	// convert update document to bson map values
+	buffer.Reset()
+	bsonBytes, err := bson.MarshalAppend(buffer.B, update)
+	if err != nil {
+		return primitive.M{}, err
+	}
+	update = primitive.M{} // reset update map and unmarshal bson bytes to it again
+	err = bson.Unmarshal(bsonBytes, update)
+	if err != nil {
+		return primitive.M{}, err
+	}
+
+	return update, nil
+}
+
 // Preloader is a preloader list for a query
-func (q *Query) Preloader() (empty bool, preloader []string) {
+func (q *Query) Preloader() (preloads []string, ok bool) {
-
 	if q.preloader == nil {
-		return false, nil
+		return nil, false
 	}
 
-	preloader = q.preloader.Preload()
+	preloads = q.preloader.Preload()
 
-	if len(preloader) == 0 {
+	return preloads, len(preloads) > 0
-		return false, nil
+}
-	}
 
-	return true, preloader
+// OnDecode callback is called after the mongo decode function
+func (q *Query) OnDecode() (callbacks Callbacks) {
+	return q.onDecode
+}
+
+// OnClose callback is called after the mongox ends a loading procedure
+func (q *Query) OnClose() (callbacks Callbacks) {
+	return q.onClose
+}
+
+// OnCreate callback is called if the mongox creates a new document instance during loading
+func (q *Query) OnCreate() (callbacks Callbacks) {
+	return q.onClose
 }
 
 // Empty checks the query for any content
-func (q *Query) Empty() bool {
+func (q *Query) Empty() (isEmpty bool) {
-
+	return len(q.m) == 0
-	qv := reflect.ValueOf(q.m)
-	keys := qv.MapKeys()
-
-	return len(keys) == 0
 }
 
 // M returns underlying query map
-func (q *Query) M() bson.M {
+func (q *Query) M() (m primitive.M) {
 	return q.m
 }
+
+// New creates a new query
+func New() (query *Query) {
+	return &Query{}
+}

mongox/query/skip.go

@@ -2,7 +2,7 @@ package query
 
 // Skipper is a filter to skip the result
 type Skipper interface {
-	Skip() *int64
+	Skip() (skip *int64)
 }
 
 // Skip is a simple implementation of the Skipper filter
@@ -11,12 +11,13 @@ type Skip int64
 var _ Skipper = Skip(0)
 
 // Skip returns a skip number
-func (l Skip) Skip() *int64 {
+func (l Skip) Skip() (skip *int64) {
-
+	if l <= 0 {
-	lim := int64(l)
-	if lim <= 0 {
 		return nil
 	}
 
-	return &lim
+	skip = new(int64)
+	*skip = int64(l)
+
+	return skip
 }

mongox/query/sort.go

@@ -1,20 +1,20 @@
 package query
 
 import (
-	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
 )
 
 // Sorter is a filter to sort the data before query
 type Sorter interface {
-	Sort() bson.M
+	Sort() (sort primitive.M)
 }
 
 // Sort is a simple implementations of the Sorter filter
-type Sort bson.M
+type Sort primitive.M
 
 var _ Sorter = &Sort{}
 
 // Sort returns a slice of fields which have to be sorted
-func (f Sort) Sort() bson.M {
+func (f Sort) Sort() (sort primitive.M) {
-	return bson.M(f)
+	return primitive.M(f)
 }

mongox/query/update.go

@@ -0,0 +1,20 @@
+package query
+
+import (
+	"go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+// Updater is a filter to update the data
+type Updater interface {
+	Update() (update primitive.M)
+}
+
+// Update is a simple implementations of the Updater filter
+type Update primitive.M
+
+var _ Updater = &Update{}
+
+// Update returns an update command
+func (u Update) Update() (update primitive.M) {
+	return primitive.M(u)
+}

mongox/query/validate.go

@@ -0,0 +1,6 @@
+package query
+
+// Validator is a filter to validate the filter
+type Validator interface {
+	Validate() (err error)
+}

mongox/utils/isnil.go

@@ -1,21 +0,0 @@
-package utils
-
-import (
-	"unsafe"
-)
-
-// IsNil function evaluates the interface value to nil
-func IsNil(i interface{}) bool {
-
-	type iface struct {
-		_   *interface{}
-		ptr unsafe.Pointer
-	}
-
-	unpacked := (*iface)(unsafe.Pointer(&i))
-	if unpacked.ptr == nil {
-		return true
-	}
-
-	return *(*unsafe.Pointer)(unpacked.ptr) == nil
-}

mongox/utils/isnil_test.go

@@ -1,32 +0,0 @@
-package utils
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestIsNil(t *testing.T) {
-
-	testvalues := []struct {
-		i     interface{}
-		isnil bool
-	}{
-		{nil, true},
-		{(*string)(nil), true},
-		{([]string)(nil), true},
-		{(map[string]string)(nil), true},
-		{(func() bool)(nil), true},
-		{(chan func() bool)(nil), true},
-		{"", true},
-		{0, true},
-		{append(([]string)(nil), ""), false},
-		{[]string{}, false},
-		{1, false},
-		{"1", false},
-	}
-
-	for _, tt := range testvalues {
-		assert.Equal(t, tt.isnil, IsNil(tt.i))
-	}
-}

testing.Dockerfile

@@ -0,0 +1,33 @@
+# syntax = docker/dockerfile:1.3-labs
+FROM registry.access.redhat.com/ubi8/ubi
+
+RUN <<EOF cat >> /etc/yum.repos.d/mongo.repo
+[mongodb-org]
+name=MongoDB Repository
+baseurl=https://repo.mongodb.org/yum/redhat/8/mongodb-org/4.4/x86_64/
+gpgcheck=1
+enabled=1
+gpgkey=https://www.mongodb.org/static/pgp/server-4.4.asc
+EOF
+
+RUN set -eux \
+    && dnf makecache \
+	&& dnf install -yq mongodb-org-server golang \
+    && dnf clean all
+
+WORKDIR /root/mongox
+
+ENV GOPATH=/root/go
+
+COPY go.mod .
+COPY go.sum .
+
+RUN set -eux \
+    && go mod download
+
+COPY mongox-testing mongox-testing
+COPY mongox mongox
+
+CMD set -eux \
+    && nohup mongod --dbpath $(mktemp -d) \
+    & go test -timeout 30s -v ./...