diff --git a/tools/goctl/model/mongo/readme.md b/tools/goctl/model/mongo/readme.md
index e8ed8be8bb12..1c19cc933457 100644
--- a/tools/goctl/model/mongo/readme.md
+++ b/tools/goctl/model/mongo/readme.md
@@ -105,7 +105,7 @@ func (m *defaultUserModel) FindOne(ctx context.Context, id string) (*User, error
 	}
 
 	var data User
-	key := prefixUserCacheKey + data.ID.Hex()
+	key := prefixUserCacheKey + id
 	err = m.conn.FindOne(ctx, key, &data, bson.M{"_id": oid})
 	switch err {
 	case nil:
diff --git a/tools/goctl/model/mongo/template/model.tpl b/tools/goctl/model/mongo/template/model.tpl
index c07d78969245..9265d13fdf18 100644
--- a/tools/goctl/model/mongo/template/model.tpl
+++ b/tools/goctl/model/mongo/template/model.tpl
@@ -47,7 +47,7 @@ func (m *default{{.Type}}Model) FindOne(ctx context.Context, id string) (*{{.Typ
     }
 
     var data {{.Type}}
-    {{if .Cache}}key := prefix{{.Type}}CacheKey + data.ID.Hex(){{end}}
+    {{if .Cache}}key := prefix{{.Type}}CacheKey + id{{end}}
     err = m.conn.FindOne(ctx, {{if .Cache}}key, {{end}}&data, bson.M{"_id": oid})
     switch err {
     case nil: