diff --git a/convert.go b/convert.go
new file mode 100644
index 0000000..187b35f
--- /dev/null
+++ b/convert.go
@@ -0,0 +1,42 @@
+package mongodb
+
+import (
+	"github.com/thoas/go-funk"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"sort"
+)
+
+// ConvertObjectIDsToStrings ...
+func ConvertObjectIDsToStrings(ids []primitive.ObjectID) []string {
+	return funk.Map(ids, func(item primitive.ObjectID) string {
+		return item.Hex()
+	}).([]string)
+}
+
+// UniqObjectIds ...
+func UniqObjectIds(ids []primitive.ObjectID) []primitive.ObjectID {
+	idStr := ConvertObjectIDsToStrings(ids)
+	idStr = funk.UniqString(idStr)
+	return ConvertStringsToObjectIDs(idStr)
+}
+
+// ConvertStringsToObjectIDs ...
+func ConvertStringsToObjectIDs(strValues []string) []primitive.ObjectID {
+	return funk.Map(strValues, func(item string) primitive.ObjectID {
+		return ConvertStringToObjectID(item)
+	}).([]primitive.ObjectID)
+}
+
+// ConvertStringToObjectID ...
+func ConvertStringToObjectID(id string) primitive.ObjectID {
+	objID, _ := primitive.ObjectIDFromHex(id)
+	return objID
+}
+
+// SortObjectId ...
+func SortObjectId(ids []primitive.ObjectID) []primitive.ObjectID {
+	sort.Slice(ids, func(i, j int) bool {
+		return ids[i].Timestamp().Before(ids[j].Timestamp())
+	})
+	return ids
+}
diff --git a/go.mod b/go.mod
index 921bc3b..bca3452 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,7 @@ go 1.16
 
 require (
 	github.com/logrusorgru/aurora v2.0.3+incompatible
+	github.com/thoas/go-funk v0.9.2 // indirect
 	go.mongodb.org/mongo-driver v1.7.1
 	golang.org/x/text v0.3.7
 )
diff --git a/go.sum b/go.sum
index 037826c..e7e1888 100644
--- a/go.sum
+++ b/go.sum
@@ -67,8 +67,11 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 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=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/thoas/go-funk v0.9.2 h1:oKlNYv0AY5nyf9g+/GhMgS/UO2ces0QRdPKwkhY3VCk=
+github.com/thoas/go-funk v0.9.2/go.mod h1:+IWnUfUmFO1+WVYQWQtIJHeRRdaIyyYglZN7xzUPe4Q=
 github.com/tidwall/pretty v1.0.0 h1:HsD+QiTn7sK6flMKIvNmpqz1qrpP3Ps6jOKIKMooyg4=
 github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
 github.com/xdg-go/pbkdf2 v1.0.0 h1:Su7DPu48wXMwC3bs7MCNG+z4FhcyEuz5dlvchbq0B0c=
@@ -114,6 +117,7 @@ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8T
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 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.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 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=