Fix comments

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.

go.mod

@@ -1,14 +1,11 @@
 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/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.1
+	github.com/stretchr/testify v1.6.1
+	github.com/valyala/bytebufferpool v1.0.0
+	go.mongodb.org/mongo-driver v1.4.3
+)

go.sum

@@ -1,7 +1,10 @@
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/aws/aws-sdk-go v1.34.28 h1:sscPpn/Ns3i0F4HPEWAVcwdIRaZZCuL7llJ2/60yPIk=
+github.com/aws/aws-sdk-go v1.34.28/go.mod h1:H7NKnBqNVzoTJpGfLrQkkD+ytBA93eiDYi/+8rV9s48=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gobuffalo/attrs v0.0.0-20190224210810-a9411de4debd/go.mod h1:4duuawTqi2wkkpB4ePgWMaai6/Kc6WEz83bhFwpHzj0=
@@ -30,29 +33,34 @@ github.com/gobuffalo/packr/v2 v2.2.0/go.mod h1:CaAwI0GPIAv+5wKLtv8Afwl+Cm78K/I/V
 github.com/gobuffalo/syncx v0.0.0-20190224160051-33c29581e754/go.mod h1:HhnNqWY95UYwwW3uSASeV7vtgYkT2t16hJgV3AEPUpw=
 github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
-github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
-github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
+github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
+github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
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 github.com/montanaflynn/stats v0.0.0-20171201202039-1bf9dbcd8cbe/go.mod h1:wL8QJuTMNUDYhXwkmfOly8iTdp5TEcJFWZD2D7SIkUc=
-github.com/pelletier/go-toml v1.4.0/go.mod h1:PN7xzY2wHTK0K9p34ErDQMlFxa51Fk0OUruD3k1mMwo=
+github.com/pelletier/go-toml v1.7.0/go.mod h1:vwGMzjaWMwyfHwgIBhI2YUM4fB6nL6lVAvS1LBMMhTE=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
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@@ -69,30 +77,30 @@ github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnIn
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
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 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
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 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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 golang.org/x/crypto v0.0.0-20190530122614-20be4c3c3ed5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d h1:1ZiEyfaQIg3Qh0EoqpwAakHVhecoE5wlSg5GjnafJGw=
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 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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@@ -104,16 +112,20 @@ golang.org/x/sys v0.0.0-20190419153524-e8e3143a4f4a/go.mod h1:h1NjWce9XRLGQEsW7w
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+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

mongox-testing/database/ephemeral.go

@@ -30,6 +30,6 @@ func NewEphemeral(URI string) (db *EphemeralDatabase, err error) {
 }
 
 // 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/getid.go

@@ -3,10 +3,10 @@ package base
 import (
 	"fmt"
 
+	"github.com/modern-go/reflect2"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 
 	"github.com/mainnika/mongox-go-driver/v2/mongox"
-	"github.com/mainnika/mongox-go-driver/v2/mongox/utils"
 )
 
 // GetID returns source document id
@@ -63,7 +63,7 @@ func getObjectOrPanic(source mongox.JSONBased) (id primitive.D) {
 func getInterfaceOrPanic(source mongox.InterfaceBased) (id interface{}) {
 
 	id = source.GetID()
-	if !utils.IsNil(id) {
+	if !reflect2.IsNil(id) {
 		return id
 	}
 

mongox/base/getprotection.go

@@ -7,11 +7,11 @@ import (
 )
 
 // GetProtection function finds protection field in the source document otherwise returns nil
-func GetProtection(source interface{}) *protection.Key {
+func GetProtection(source interface{}) (key *protection.Key) {
 
 	v := reflect.ValueOf(source)
 	if v.Kind() != reflect.Ptr || v.IsNil() {
-		return nil
+		return
 	}
 
 	el := v.Elem()
@@ -25,14 +25,16 @@ func GetProtection(source interface{}) *protection.Key {
 
 		switch field.Interface().(type) {
 		case *protection.Key:
-			return field.Interface().(*protection.Key)
+			key = field.Interface().(*protection.Key)
 		case protection.Key:
 			ptr := field.Addr()
-			return ptr.Interface().(*protection.Key)
+			key = ptr.Interface().(*protection.Key)
 		default:
 			continue
 		}
+
+		return
 	}
 
-	return nil
+	return
 }

mongox/base/jsonbased/id.go

@@ -14,7 +14,7 @@ type Primary struct {
 }
 
 // GetID returns an _id
-func (p *Primary) GetID() primitive.D {
+func (p *Primary) GetID() (id primitive.D) {
 	return p.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
 }
 

mongox/base/protection/key.go

@@ -1,6 +1,9 @@
 package protection
 
 import (
+	"time"
+
+	"github.com/modern-go/reflect2"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 )
 
@@ -9,3 +12,25 @@ type Key struct {
 	X primitive.ObjectID `bson:"_x" json:"_x" index:",hashed"`
 	V int64              `bson:"_v" json:"_v"`
 }
+
+// PutToDocument extends the doc with protection key values
+func (k *Key) PutToDocument(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()
+}

mongox/base/reset.go

@@ -1,11 +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 +15,18 @@ 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
 }
 

mongox/database/count.go

@@ -1,32 +1,30 @@
 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
+	}
 
 	collection := d.GetCollectionOf(target)
-	opts := options.Count()
-	composed := query.Compose(filters...)
+	ctx := query.WithContext(d.Context(), composed)
 
+	opts := options.Count()
 	opts.Limit = composed.Limiter()
 	opts.Skip = composed.Skipper()
 
-	result, err := collection.CountDocuments(d.Context(), composed.M(), opts)
-	if err == mongox.ErrNoDocuments {
-		return 0, err
-	}
-	if err != nil {
-		return 0, fmt.Errorf("can't decode desult: %w", err)
-	}
+	result, err = collection.CountDocuments(ctx, composed.M(), opts)
 
-	return result, nil
+	_ = composed.OnClose().Invoke(ctx, target)
+
+	return
 }

mongox/database/database.go

@@ -22,17 +22,18 @@ type Database struct {
 }
 
 // NewDatabase function creates new database instance with mongo client and empty context
-func NewDatabase(client *mongox.Client, dbname string) mongox.Database {
+func NewDatabase(client *mongox.Client, dbname string) (db mongox.Database) {
 
-	db := &Database{}
-	db.client = client
-	db.dbname = dbname
+	db = &Database{
+		client: client,
+		dbname: dbname,
+	}
 
-	return db
+	return
 }
 
 // Client function returns a mongo client
-func (d *Database) Client() *mongox.Client {
+func (d *Database) Client() (client *mongox.Client) {
 	return d.client
 }
 
@@ -48,22 +49,24 @@ func (d *Database) Context() (ctx context.Context) {
 }
 
 // Name function returns a database name
-func (d *Database) Name() string {
+func (d *Database) Name() (name string) {
 	return d.dbname
 }
 
 // New function creates new database context with same client
-func (d *Database) New(ctx context.Context) mongox.Database {
+func (d *Database) New(ctx context.Context) (db mongox.Database) {
 
 	if ctx == nil {
 		ctx = context.Background()
 	}
 
-	return &Database{
+	db = &Database{
 		client: d.client,
 		dbname: d.dbname,
 		ctx:    ctx,
 	}
+
+	return
 }
 
 // GetCollectionOf returns the collection object by the «collection» tag of the given document;
@@ -72,7 +75,7 @@ func (d *Database) New(ctx context.Context) mongox.Database {
 //     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) {
 
 	el := reflect.TypeOf(document).Elem()
 	numField := el.NumField()
@@ -111,7 +114,7 @@ func (d *Database) createAggregateLoad(target interface{}, composed *query.Query
 	pipeline := primitive.A{}
 
 	if !composed.Empty() {
-		pipeline = append(pipeline, primitive.M{"$match": primitive.M{"$expr": composed.M()}})
+		pipeline = append(pipeline, primitive.M{"$match": composed.M()})
 	}
 	if composed.Sorter() != nil {
 		pipeline = append(pipeline, primitive.M{"$sort": composed.Sorter()})
@@ -126,7 +129,7 @@ func (d *Database) createAggregateLoad(target interface{}, composed *query.Query
 	el := reflect.ValueOf(target).Elem()
 	elType := el.Type()
 	numField := elType.NumField()
-	_, preloads := composed.Preloader()
+	preloads, _ := composed.Preloader()
 
 	for i := 0; i < numField; i++ {
 
@@ -137,9 +140,9 @@ func (d *Database) createAggregateLoad(target interface{}, composed *query.Query
 		if !ok {
 			continue
 		}
-		jsonTag, ok := tag.Lookup("json")
+		jsonTag, _ := tag.Lookup("json")
 		if jsonTag == "-" {
-			return nil, fmt.Errorf("preload private field is impossible")
+			panic(fmt.Errorf("preload private field is impossible"))
 		}
 
 		jsonData := strings.SplitN(jsonTag, ",", 2)
@@ -153,7 +156,7 @@ func (d *Database) createAggregateLoad(target interface{}, composed *query.Query
 			continue
 		}
 		if len(preloadData) == 1 {
-			panic("there is no foreign field")
+			panic(fmt.Errorf("there is no foreign field"))
 		}
 
 		localField := strings.TrimSpace(preloadData[0])
@@ -163,7 +166,7 @@ func (d *Database) createAggregateLoad(target interface{}, composed *query.Query
 
 		foreignField := strings.TrimSpace(preloadData[1])
 		if len(foreignField) == 0 {
-			panic("there is no foreign field")
+			panic(fmt.Errorf("there is no foreign field"))
 		}
 
 		preloadLimiter := 100
@@ -195,7 +198,7 @@ func (d *Database) createAggregateLoad(target interface{}, composed *query.Query
 				typ = typ.Elem()
 			}
 			if typ.Kind() != reflect.Ptr {
-				panic("preload field should have ptr type")
+				panic(fmt.Errorf("preload field should have ptr type"))
 			}
 
 			lookupCollection := d.GetCollectionOf(reflect.Zero(typ).Interface())

mongox/database/deletearray.go

@@ -8,10 +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()
@@ -34,26 +35,43 @@ func (d *Database) DeleteArray(target interface{}) error {
 
 	zeroElem := reflect.Zero(targetSliceElemT)
 	targetLen := targetSliceV.Len()
+
+	composed, err := query.Compose(filters...)
+	if err != nil {
+		return
+	}
+
 	collection := d.GetCollectionOf(zeroElem.Interface())
-	opts := options.Delete()
 	ids := primitive.A{}
+	ctx := query.WithContext(d.Context(), composed)
 
 	for i := 0; i < targetLen; i++ {
 		elem := targetSliceV.Index(i)
 		ids = append(ids, base.GetID(elem.Interface()))
 	}
 
+	defer func() {
+		invokerr := composed.OnClose().Invoke(ctx, target)
+		if err == nil {
+			err = invokerr
+		}
+
+		return
+	}()
+
 	if len(ids) == 0 {
 		return fmt.Errorf("can't delete zero elements")
 	}
 
-	result, err := collection.DeleteMany(d.Context(), primitive.M{"_id": primitive.M{"$in": ids}}, opts)
+	composed.And(primitive.M{"_id": primitive.M{"$in": ids}})
+
+	result, err := collection.DeleteMany(ctx, composed.M(), options.Delete())
 	if err != nil {
-		return fmt.Errorf("can't create find and delete result: %w", err)
+		return
 	}
 	if result.DeletedCount != int64(targetLen) {
-		return fmt.Errorf("can't verify delete result: removed count mismatch %d != %d", result.DeletedCount, targetLen)
+		err = fmt.Errorf("can't verify delete result: removed count mismatch %d != %d", result.DeletedCount, targetLen)
 	}
 
-	return nil
+	return
 }

mongox/database/deleteone.go

@@ -2,49 +2,62 @@ package database
 
 import (
 	"fmt"
-	"time"
 
+	"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
+	}
 
 	collection := d.GetCollectionOf(target)
-	opts := &options.FindOneAndDeleteOptions{}
-	composed := query.Compose(filters...)
 	protected := base.GetProtection(target)
+	ctx := query.WithContext(d.Context(), composed)
 
+	opts := options.FindOneAndDelete()
 	opts.Sort = composed.Sorter()
 
-	if !utils.IsNil(target) {
+	if !reflect2.IsNil(target) {
 		composed.And(primitive.M{"_id": base.GetID(target)})
 	}
 
 	if protected != nil {
 		query.Push(composed, protected)
-		protected.X = primitive.NewObjectID()
-		protected.V = time.Now().Unix()
+		protected.Restate()
 	}
 
-	result := collection.FindOneAndDelete(d.Context(), composed.M(), opts)
+	defer func() {
+		invokerr := composed.OnClose().Invoke(ctx, target)
+		if err == nil {
+			err = invokerr
+		}
+
+		return
+	}()
+
+	result := collection.FindOneAndDelete(ctx, 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)
-	if err == mongox.ErrNoDocuments {
-		return err
-	}
+	err = result.Decode(target)
 	if err != nil {
-		return fmt.Errorf("can't decode result: %w", err)
+		return
 	}
 
-	return nil
+	err = composed.OnDecode().Invoke(ctx, target)
+	if err != nil {
+		return
+	}
+
+	return
 }

mongox/database/index.go

@@ -21,7 +21,7 @@ import (
 //   `index:"-,+foo,+-bar,unique,allowNull"` -- https://docs.mongodb.com/manual/core/index-partial
 //   `index:"-,unique,allowNull,expireAfter=86400"` -- https://docs.mongodb.com/manual/core/index-ttl
 //   `index:"-,unique,allowNull,expireAfter={{.Expire}}"` -- evaluate index as a golang template with `cfg` arguments
-func (d *Database) IndexEnsure(cfg interface{}, document interface{}) error {
+func (d *Database) IndexEnsure(cfg interface{}, document interface{}) (err error) {
 
 	el := reflect.ValueOf(document).Elem().Type()
 	numField := el.NumField()
@@ -41,14 +41,16 @@ 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{}
-		tpl, err := template.New("").Parse(indexTag)
+		var tmpBuffer = &bytes.Buffer{}
+		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 +66,15 @@ 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 +116,9 @@ 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:
@@ -126,9 +128,9 @@ func (d *Database) IndexEnsure(cfg interface{}, document interface{}) error {
 
 		_, err = documents.Indexes().CreateOne(d.Context(), mongo.IndexModel{Keys: index, Options: opts})
 		if err != nil {
-			return err
+			return
 		}
 	}
 
-	return nil
+	return
 }

mongox/database/loadarray.go

@@ -10,7 +10,7 @@ import (
 )
 
 // 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()
@@ -31,12 +31,34 @@ func (d *Database) LoadArray(target interface{}, filters ...interface{}) error {
 		panic(fmt.Errorf("target slice should contain ptrs"))
 	}
 
-	composed := query.Compose(filters...)
+	composed, err := query.Compose(filters...)
+	if err != nil {
+		return
+	}
+
 	zeroElem := reflect.Zero(targetSliceElemT)
-	hasPreloader, _ := composed.Preloader()
+	_, hasPreloader := composed.Preloader()
+	ctx := query.WithContext(d.Context(), composed)
 
 	var result *mongox.Cursor
-	var err error
+	var i int
+
+	defer func() {
+
+		if result != nil {
+			closerr := result.Close(ctx)
+			if err == nil {
+				err = closerr
+			}
+		}
+
+		invokerr := composed.OnClose().Invoke(ctx, target)
+		if err == nil {
+			err = invokerr
+		}
+
+		return
+	}()
 
 	if hasPreloader {
 		result, err = d.createAggregateLoad(zeroElem.Interface(), composed)
@@ -44,32 +66,53 @@ func (d *Database) LoadArray(target interface{}, filters ...interface{}) error {
 		result, err = d.createSimpleLoad(zeroElem.Interface(), composed)
 	}
 	if err != nil {
-		return fmt.Errorf("can't create find result: %w", err)
+		err = fmt.Errorf("can't create find result: %w", err)
+		return
 	}
 
-	var i int
+	for i = 0; result.Next(ctx); i++ {
 
-	for i = 0; result.Next(d.Context()); {
-		if targetSliceV.Len() == i {
-			elem := reflect.New(targetSliceElemT.Elem())
-			if err = result.Decode(elem.Interface()); err == nil {
-				targetSliceV = reflect.Append(targetSliceV, elem)
-			} else {
-				continue
+		var elem interface{}
+
+		if i == targetSliceV.Len() {
+			value := reflect.New(targetSliceElemT.Elem())
+			elem = value.Interface()
+
+			err = composed.OnCreate().Invoke(ctx, elem)
+			if err != nil {
+				return
 			}
+
+			err = result.Decode(elem)
+			if err != nil {
+				return
+			}
+
+			targetSliceV = reflect.Append(targetSliceV, value)
 		} else {
-			elem := targetSliceV.Index(i).Interface()
-			base.Reset(elem)
-			if err = result.Decode(elem); err != nil {
-				continue
+			elem = targetSliceV.Index(i).Interface()
+
+			if created := base.Reset(elem); created {
+				err = composed.OnCreate().Invoke(ctx, elem)
+			}
+			if err != nil {
+				return
+			}
+
+			err = result.Decode(elem)
+			if err != nil {
+				return
 			}
 		}
 
-		i++
+		err = composed.OnDecode().Invoke(ctx, elem)
+		if err != nil {
+			return
+		}
 	}
 
 	targetSliceV = targetSliceV.Slice(0, i)
 	targetV.Elem().Set(targetSliceV)
 
-	return result.Close(d.Context())
+	return
 }

mongox/database/loadone.go

@@ -9,13 +9,34 @@ import (
 )
 
 // 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 := query.Compose(append(filters, query.Limit(1))...)
-	hasPreloader, _ := composed.Preloader()
+	composed, err := query.Compose(append(filters, query.Limit(1))...)
+	if err != nil {
+		return
+	}
+
+	_, hasPreloader := composed.Preloader()
+	ctx := query.WithContext(d.Context(), composed)
 
 	var result *mongox.Cursor
-	var err error
+
+	defer func() {
+
+		if result != nil {
+			closerr := result.Close(ctx)
+			if err == nil {
+				err = closerr
+			}
+		}
+
+		invokerr := composed.OnClose().Invoke(ctx, target)
+		if err == nil {
+			err = invokerr
+		}
+
+		return
+	}()
 
 	if hasPreloader {
 		result, err = d.createAggregateLoad(target, composed)
@@ -26,15 +47,31 @@ func (d *Database) LoadOne(target interface{}, filters ...interface{}) error {
 		return fmt.Errorf("can't create find result: %w", err)
 	}
 
-	hasNext := result.Next(d.Context())
+	hasNext := result.Next(ctx)
 	if result.Err() != nil {
-		return err
+		err = result.Err()
+		return
 	}
 	if !hasNext {
 		return mongox.ErrNoDocuments
 	}
 
-	base.Reset(target)
+	if created := base.Reset(target); created {
+		err = composed.OnCreate().Invoke(ctx, target)
+	}
+	if err != nil {
+		return
+	}
 
-	return result.Decode(target)
+	err = result.Decode(target)
+	if err != nil {
+		return
+	}
+
+	err = composed.OnDecode().Invoke(ctx, target)
+	if err != nil {
+		return
+	}
+
+	return
 }

mongox/database/loadstream.go

@@ -8,13 +8,17 @@ import (
 )
 
 // 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...)
+	if err != nil {
+		return
+	}
+
+	_, hasPreloader := composed.Preloader()
+	ctx := query.WithContext(d.Context(), composed)
 
 	var cursor *mongox.Cursor
-	var err error
-
-	composed := query.Compose(filters...)
-	hasPreloader, _ := composed.Preloader()
 
 	if hasPreloader {
 		cursor, err = d.createAggregateLoad(target, composed)
@@ -22,10 +26,11 @@ func (d *Database) LoadStream(target interface{}, filters ...interface{}) (mongo
 		cursor, err = d.createSimpleLoad(target, composed)
 	}
 	if err != nil {
-		return nil, fmt.Errorf("can't create find result: %w", err)
+		err = fmt.Errorf("can't create find result: %w", err)
+		return
 	}
 
-	l := &StreamLoader{cur: cursor, ctx: d.Context(), target: target}
+	loader = &StreamLoader{cur: cursor, ctx: ctx, ref: target, query: composed}
 
-	return l, nil
+	return
 }

mongox/database/saveone.go

@@ -1,9 +1,6 @@
 package database
 
 import (
-	"time"
-
-	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 	"go.mongodb.org/mongo-driver/mongo/options"
 
@@ -12,27 +9,52 @@ 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) {
+
+	composed, err := query.Compose(filters...)
+	if err != nil {
+		return
+	}
 
 	collection := d.GetCollectionOf(source)
-	opts := options.FindOneAndReplace()
 	id := base.GetID(source)
 	protected := base.GetProtection(source)
-	composed := query.Compose(bson.M{"_id": id})
+	ctx := query.WithContext(d.Context(), composed)
 
+	composed.And(primitive.M{"_id": id})
+
+	opts := options.FindOneAndReplace()
 	opts.SetUpsert(true)
 	opts.SetReturnDocument(options.After)
 
 	if protected != nil {
 		query.Push(composed, protected)
-		protected.X = primitive.NewObjectID()
-		protected.V = time.Now().Unix()
+		protected.Restate()
 	}
 
-	result := collection.FindOneAndReplace(d.Context(), composed.M(), source, opts)
+	defer func() {
+		invokerr := composed.OnClose().Invoke(ctx, source)
+		if err == nil {
+			err = invokerr
+		}
+
+		return
+	}()
+
+	result := collection.FindOneAndReplace(ctx, composed.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

@@ -2,78 +2,100 @@ 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
-	ctx    context.Context
-	target interface{}
+	cur   *mongox.Cursor
+	query *query.Query
+	ctx   context.Context
+	ref   interface{}
 }
 
-// DecodeNext loads next documents to a target or returns an error
-func (l *StreamLoader) DecodeNext() error {
+// DecodeNextMsg decodes the next document to an interface or returns an error
+func (l *StreamLoader) DecodeNextMsg(i interface{}) (err error) {
 
-	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)
+	err = l.Next()
 	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
-func (l *StreamLoader) Decode() error {
+// DecodeMsg decodes the current cursor document into an interface
+func (l *StreamLoader) DecodeMsg(i interface{}) (err error) {
 
-	base.Reset(l.target)
-
-	err := l.cur.Decode(l.target)
+	if created := base.Reset(i); created {
+		err = l.query.OnDecode().Invoke(l.ctx, i)
+	}
 	if err != nil {
-		return fmt.Errorf("can't decode desult: %w", err)
+		return
 	}
 
-	return nil
+	err = l.cur.Decode(i)
+	if err != nil {
+		return
+	}
+
+	err = l.query.OnDecode().Invoke(l.ctx, i)
+	if err != nil {
+		return
+	}
+
+	return
 }
 
 // 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 {
-		return l.cur.Err()
+	if err != nil {
+		return
 	}
 	if !hasNext {
-		return mongox.ErrNoDocuments
+		err = mongox.ErrNoDocuments
 	}
 
-	return nil
+	return
 }
 
-func (l *StreamLoader) Cursor() *mongox.Cursor {
+// Cursor returns the underlying cursor
+func (l *StreamLoader) Cursor() (cursor *mongox.Cursor) {
 	return l.cur
 }
 
-// Close cursor
-func (l *StreamLoader) Close() error {
-	return l.cur.Close(l.ctx)
+// Close stream loader and the underlying cursor
+func (l *StreamLoader) Close() (err error) {
+
+	closerr := l.cur.Close(l.ctx)
+	invokerr := l.query.OnClose().Invoke(l.ctx, l.ref)
+
+	if closerr != nil {
+		err = closerr
+		return
+	}
+
+	if invokerr != nil {
+		err = invokerr
+		return
+	}
+
+	return
 }
 
-func (l *StreamLoader) Err() error {
+// Err returns the last error
+func (l *StreamLoader) Err() (err error) {
 	return l.cur.Err()
 }

mongox/database/updateone.go

@@ -0,0 +1,72 @@
+package database
+
+import (
+	"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/base"
+	"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
+	}
+
+	updaterDoc, err := composed.Updater()
+	if err != nil {
+		return
+	}
+
+	collection := d.GetCollectionOf(target)
+	protected := base.GetProtection(target)
+	ctx := query.WithContext(d.Context(), composed)
+
+	opts := options.FindOneAndUpdate()
+	opts.SetReturnDocument(options.After)
+
+	if protected != nil {
+		if !protected.X.IsZero() {
+			query.Push(composed, protected)
+		}
+
+		protected.Restate()
+
+		setCmd, _ := updaterDoc["$set"].(primitive.M)
+		if reflect2.IsNil(setCmd) {
+			setCmd = primitive.M{}
+		}
+		protected.PutToDocument(setCmd)
+		updaterDoc["$set"] = setCmd
+	}
+
+	defer func() {
+		invokerr := composed.OnClose().Invoke(ctx, target)
+		if err == nil {
+			err = invokerr
+		}
+
+		return
+	}()
+
+	result := collection.FindOneAndUpdate(ctx, composed.M(), updaterDoc, opts)
+	if result.Err() != nil {
+		return result.Err()
+	}
+
+	err = result.Decode(target)
+	if err != nil {
+		return
+	}
+
+	err = composed.OnDecode().Invoke(ctx, target)
+	if err != nil {
+		return
+	}
+
+	return
+}

mongox/mongox.go

@@ -16,51 +16,52 @@ type (
 
 // Database is the mongox database interface
 type Database interface {
-	Client() *Client
-	Context() context.Context
-	Name() string
-	New(ctx context.Context) Database
-	GetCollectionOf(document interface{}) *Collection
-	Count(target interface{}, filters ...interface{}) (int64, error)
-	DeleteArray(target interface{}) error
-	DeleteOne(target interface{}, filters ...interface{}) error
-	LoadArray(target interface{}, filters ...interface{}) error
-	LoadOne(target interface{}, filters ...interface{}) error
-	LoadStream(target interface{}, filters ...interface{}) (StreamLoader, error)
-	SaveOne(source interface{}) error
-	IndexEnsure(cfg interface{}, document interface{}) error
+	Client() (client *Client)
+	Context() (context context.Context)
+	Name() (name string)
+	New(ctx context.Context) (db Database)
+	GetCollectionOf(document interface{}) (collection *Collection)
+	Count(target interface{}, filters ...interface{}) (count int64, err error)
+	DeleteArray(target interface{}, filters ...interface{}) (err error)
+	DeleteOne(target interface{}, filters ...interface{}) (err error)
+	LoadArray(target interface{}, filters ...interface{}) (err error)
+	LoadOne(target interface{}, filters ...interface{}) (err error)
+	LoadStream(target interface{}, filters ...interface{}) (loader StreamLoader, err error)
+	SaveOne(source interface{}, filters ...interface{}) (err error)
+	UpdateOne(target interface{}, filters ...interface{}) (err error)
+	IndexEnsure(cfg interface{}, document interface{}) (err error)
 }
 
 // StreamLoader is a interface to control database cursor
 type StreamLoader interface {
-	Cursor() *Cursor
-	DecodeNext() error
-	Decode() error
-	Next() error
-	Close() error
-	Err() error
+	Cursor() (cursor *Cursor)
+	DecodeNextMsg(i interface{}) (err error)
+	DecodeMsg(i interface{}) (err error)
+	Next() (err error)
+	Close() (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
 type JSONBased 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
+		}
+	}
+
+	return
+}

mongox/query/compose.go

@@ -3,50 +3,69 @@ 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) {
 
-	q := &Query{}
+	query = &Query{}
 
-	for _, f := range filters {
-		if !Push(q, f) {
-			panic(fmt.Errorf("unknown filter %v", f))
+	for _, filter := range filters {
+		ok, err := Push(query, filter)
+		if err != nil {
+			return nil, fmt.Errorf("invalid filter %v, %w", filter, err)
+		}
+		if !ok {
+			panic(fmt.Errorf("unknown filter %v", filter))
 		}
 	}
 
-	return q
+	return
 }
 
 // Push applies single filter to a query
-func Push(q *Query, f interface{}) bool {
+func Push(query *Query, filter interface{}) (ok bool, err error) {
 
-	if utils.IsNil(f) {
-		return true
+	ok = reflect2.IsNil(filter)
+	if ok {
+		return
 	}
 
-	ok := false
-	ok = ok || applyBson(q, f)
-	ok = ok || applyLimit(q, f)
-	ok = ok || applySort(q, f)
-	ok = ok || applySkip(q, f)
-	ok = ok || applyProtection(q, f)
-	ok = ok || applyPreloader(q, f)
+	validator, hasValidator := filter.(Validator)
+	if hasValidator {
+		err = validator.Validate()
+	}
+	if err != nil {
+		return
+	}
 
-	return ok
+	for _, applier := range []applyFilterFunc{
+		applyBson,
+		applyLimit,
+		applySort,
+		applySkip,
+		applyProtection,
+		applyPreloader,
+		applyUpdater,
+		applyCallbacks,
+	} {
+		ok = applier(query, filter) || ok
+	}
+
+	return
 }
 
-// applyBson is a fallback for a custom bson.M
-func applyBson(q *Query, f interface{}) bool {
+// applyBson is a fallback for a custom primitive.M
+func applyBson(query *Query, filter interface{}) (ok bool) {
 
-	if f, ok := f.(bson.M); ok {
-		q.And(f)
+	if filter, ok := filter.(primitive.M); ok {
+		query.And(filter)
 		return true
 	}
 
@@ -54,10 +73,10 @@ 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 f, ok := f.(Limiter); ok {
-		q.limiter = f
+	if filter, ok := filter.(Limiter); ok {
+		query.limiter = filter
 		return true
 	}
 
@@ -65,10 +84,10 @@ 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 f, ok := f.(Sorter); ok {
-		q.sorter = f
+	if filter, ok := filter.(Sorter); ok {
+		query.sorter = filter
 		return true
 	}
 
@@ -76,50 +95,65 @@ 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 f, ok := f.(Skipper); ok {
-		q.skipper = f
+	if filter, ok := filter.(Skipper); ok {
+		query.skipper = filter
 		return true
 	}
 
 	return false
 }
 
-func applyProtection(q *Query, f interface{}) bool {
+func applyProtection(query *Query, filter interface{}) (ok bool) {
 
-	var x *primitive.ObjectID
-	var v *int64
+	var keyDoc = primitive.M{}
 
-	switch f := f.(type) {
+	switch filter := filter.(type) {
 	case protection.Key:
-		x = &f.X
-		v = &f.V
+		filter.PutToDocument(keyDoc)
 	case *protection.Key:
-		x = &f.X
-		v = &f.V
+		filter.PutToDocument(keyDoc)
 
 	default:
 		return false
 	}
 
-	if x.IsZero() {
-		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})
-	}
+	query.And(keyDoc)
 
 	return true
 }
 
-func applyPreloader(q *Query, f interface{}) bool {
+func applyPreloader(query *Query, filter interface{}) (ok bool) {
 
-	if f, ok := f.(Preloader); ok {
-		q.preloader = f
+	if filter, ok := filter.(Preloader); ok {
+		query.preloader = filter
 		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/context.go

@@ -0,0 +1,19 @@
+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)
+	return
+}
+
+// WithContext function creates the new context with request data
+func WithContext(ctx context.Context, q *Query) (withQuery context.Context) {
+	withQuery = context.WithValue(ctx, ctxQueryKey{}, q)
+	return
+}

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 +11,14 @@ type Limit int64
 var _ Limiter = Limit(0)
 
 // Limit returns a limit
-func (l Limit) Limit() *int64 {
+func (l Limit) Limit() (limit *int64) {
 
-	lim := int64(l)
-	if lim <= 0 {
-		return nil
+	if l <= 0 {
+		return
 	}
 
-	return &lim
+	limit = new(int64)
+	*limit = int64(l)
+
+	return
 }

mongox/query/preload.go

@@ -2,7 +2,7 @@ package query
 
 // Preloader is a filter to skip the result
 type Preloader interface {
-	Preload() []string
+	Preload() (preloads []string)
 }
 
 // Preload is a simple implementation of the Skipper filter
@@ -11,6 +11,6 @@ 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

@@ -1,31 +1,36 @@
 package query
 
 import (
+	"github.com/modern-go/reflect2"
+	"github.com/valyala/bytebufferpool"
 	"go.mongodb.org/mongo-driver/bson"
-
-	"reflect"
+	"go.mongodb.org/mongo-driver/bson/primitive"
 )
 
-// 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
 	}
 
@@ -35,61 +40,101 @@ func (q *Query) And(elem bson.M) *Query {
 }
 
 // Limiter returns limiter value or nil
-func (q *Query) Limiter() *int64 {
+func (q *Query) Limiter() (limit *int64) {
 
 	if q.limiter == nil {
-		return nil
+		return
 	}
 
 	return q.limiter.Limit()
 }
 
 // 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
+		return
 	}
 
 	return q.sorter.Sort()
 }
 
 // Skipper is a skipper for a query
-func (q *Query) Skipper() *int64 {
+func (q *Query) Skipper() (skip *int64) {
 
 	if q.skipper == nil {
-		return nil
+		return
 	}
 
 	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 {
+		update = primitive.M{}
+		return
+	}
+
+	update = q.updater.Update()
+
+	if reflect2.IsNil(update) {
+		update = primitive.M{}
+		return
+	}
+
+	buffer := bytebufferpool.Get()
+	defer bytebufferpool.Put(buffer)
+
+	// convert update document to bson map values
+	bsonBytes, err := bson.MarshalAppend(buffer.B, update)
+	if err != nil {
+		return
+	}
+	update = primitive.M{}
+	err = bson.Unmarshal(bsonBytes, update)
+	if err != nil {
+		return
+	}
+
+	return
+}
+
 // 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()
+	ok = len(preloads) > 0
 
-	if len(preloader) == 0 {
-		return false, nil
-	}
+	return
+}
 
-	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 {
-
-	qv := reflect.ValueOf(q.m)
-	keys := qv.MapKeys()
-
-	return len(keys) == 0
+func (q *Query) Empty() (isEmpty bool) {
+	return len(q.m) == 0
 }
 
 // M returns underlying query map
-func (q *Query) M() bson.M {
+func (q *Query) M() (m primitive.M) {
 	return q.m
 }

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 +11,14 @@ type Skip int64
 var _ Skipper = Skip(0)
 
 // Skip returns a skip number
-func (l Skip) Skip() *int64 {
+func (l Skip) Skip() (skip *int64) {
 
-	lim := int64(l)
-	if lim <= 0 {
-		return nil
+	if l <= 0 {
+		return
 	}
 
-	return &lim
+	skip = new(int64)
+	*skip = int64(l)
+
+	return
 }

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 {
-	return bson.M(f)
+func (f Sort) Sort() (sort primitive.M) {
+	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))
-	}
-}