map default namespace try

leveldb.go

@@ -68,8 +68,13 @@ func (ldb *LevelDB) Get(key string, ns ...string) ([]byte, error) {
 
 func (ldb *LevelDB) Set(key string, value []byte, ns ...string) error {
 	namespace := resolveNamespace(ns)
+	key = path.Join(namespace, key)
 	batch := &leveldb.Batch{}
-	batch.Put([]byte(path.Join(namespace, key)), value)
+	if value != nil {
+		batch.Put([]byte(key), value)
+	} else {
+		batch.Delete([]byte(key))
+	}
 	return ldb.db.Write(batch, nil)
 }