diff --git a/storage/driver/boltdb.go b/storage/driver/boltdb.go
index 23e5dfa..1d1850f 100644
--- a/storage/driver/boltdb.go
+++ b/storage/driver/boltdb.go
@@ -8,6 +8,7 @@ import (
 	"local/dndex/storage/entity"
 	"os"
 	"regexp"
+	"strings"
 
 	"github.com/boltdb/bolt"
 	"go.mongodb.org/mongo-driver/bson"
@@ -262,6 +263,8 @@ func apply(doc bson.M, operator interface{}) (bson.M, error) {
 		switch k {
 		case "$set":
 			op = applySet
+		case "$unset":
+			op = applyUnset
 		default:
 			return nil, errors.New("cannot apply operation " + k)
 		}
@@ -273,6 +276,38 @@ func apply(doc bson.M, operator interface{}) (bson.M, error) {
 	return doc, nil
 }
 
+func applyUnset(doc, operator bson.M) (bson.M, error) {
+	for k := range operator {
+		if k == entity.Name {
+			return nil, errModifiedReserved
+		}
+		nesting := strings.Split(k, ".")
+		if len(nesting) > 1 {
+			mInterface, ok := doc[nesting[0]]
+			if !ok {
+				return nil, fmt.Errorf("path does not exist: %s (%s): %+v", k, nesting[0], doc)
+			}
+			m, ok := mInterface.(map[string]interface{})
+			if !ok {
+				pm, pmok := mInterface.(primitive.M)
+				m = map[string]interface{}(pm)
+				ok = pmok
+			}
+			if !ok {
+				return nil, fmt.Errorf("subpath cannot be followed for non object: %s (%s): %+v (%T)", k, nesting[0], mInterface, mInterface)
+			}
+			subdoc, err := applyUnset(bson.M(m), bson.M{strings.Join(nesting[1:], "."): ""})
+			if err != nil {
+				return nil, err
+			}
+			operator[k] = subdoc
+		} else {
+			delete(doc, k)
+		}
+	}
+	return doc, nil
+}
+
 func applySet(doc, operator bson.M) (bson.M, error) {
 	for k, v := range operator {
 		if k == entity.Name {
diff --git a/storage/driver/boltdb_test.go b/storage/driver/boltdb_test.go
index 1d58b6d..943b58b 100644
--- a/storage/driver/boltdb_test.go
+++ b/storage/driver/boltdb_test.go
@@ -179,6 +179,10 @@ func TestBoltDBUpdate(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	if err := bdb.Update(context.TODO(), testNS, ones[0].Query(), operator.Unset(entity.Type)); err != nil {
+		t.Fatal(err)
+	}
+
 	if n, err := bdb.count(context.TODO(), testNS, map[string]string{}); err != nil {
 		t.Fatal(err)
 	} else if n != testN {
@@ -202,6 +206,9 @@ func TestBoltDBUpdate(t *testing.T) {
 		if err := bson.Unmarshal(j, &o); err != nil {
 			t.Fatal(err)
 		}
+		if o.Type != "" {
+			t.Fatalf("doc still has Type even though $unset called: %+v", o)
+		}
 		if fmt.Sprint(ones[0]) == fmt.Sprint(o) {
 			t.Fatal(ones[0], o)
 		}
@@ -210,6 +217,11 @@ func TestBoltDBUpdate(t *testing.T) {
 		if fmt.Sprint(ones[0]) == fmt.Sprint(o) {
 			t.Fatal(ones[0], o)
 		}
+		ones[0].Type = ""
+		o.Type = ""
+		if fmt.Sprint(ones[0]) == fmt.Sprint(o) {
+			t.Fatal(ones[0], o)
+		}
 		ones[0].Modified = 0
 		o.Modified = 0
 		if fmt.Sprint(ones[0]) != fmt.Sprint(o) {
diff --git a/storage/graph.go b/storage/graph.go
index 2a6d940..a4eebfd 100644
--- a/storage/graph.go
+++ b/storage/graph.go
@@ -3,9 +3,11 @@ package storage
 import (
 	"context"
 	"fmt"
+	"local/dndex/config"
 	"local/dndex/storage/driver"
 	"local/dndex/storage/entity"
 	"local/dndex/storage/operator"
+	"strings"
 
 	"go.mongodb.org/mongo-driver/bson"
 )
@@ -15,9 +17,15 @@ type Graph struct {
 }
 
 func NewGraph() Graph {
-	mongo := driver.NewMongo()
+	var d driver.Driver
+	switch strings.ToLower(config.New().DriverType) {
+	case "mongo":
+		d = driver.NewMongo()
+	case "boltdb":
+		d = driver.NewBoltDB()
+	}
 	return Graph{
-		driver: mongo,
+		driver: d,
 	}
 }