Binary single loader

mongox/common/loadbinary.go

@@ -0,0 +1,35 @@
+package common
+
+import (
+	"github.com/mainnika/mongox-go-driver/mongox"
+	"github.com/mainnika/mongox-go-driver/mongox/errors"
+	"github.com/mainnika/mongox-go-driver/mongox/query"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+// LoadBinary function loads a first single target document by a query
+func LoadBinary(db *mongox.Database, target interface{}, filters ...interface{}) (bson.Raw, error) {
+
+	collection := db.GetCollectionOf(target)
+	opts := options.FindOne()
+	composed := query.Compose(filters...)
+
+	opts.Sort = composed.Sorter()
+
+	result := collection.FindOne(db.Context(), composed.M(), opts)
+	if result.Err() != nil {
+		return nil, errors.InternalErrorf("can't create find one result: %s", result.Err())
+	}
+
+	bytes, err := result.DecodeBytes()
+	if err == mongo.ErrNoDocuments {
+		return nil, errors.NotFoundErrorf("%s", err)
+	}
+	if err != nil {
+		return nil, errors.InternalErrorf("can't decode desult: %s", err)
+	}
+
+	return bytes, nil
+}