diff --git a/src/Engines/MySQLEngine.php b/src/Engines/MySQLEngine.php
index 54044f1..3906943 100644
--- a/src/Engines/MySQLEngine.php
+++ b/src/Engines/MySQLEngine.php
@@ -27,6 +27,10 @@ public function delete($models)
     {
     }
 
+    public function mapIds($results)
+    {
+    }
+
     /**
      * Perform the given search on the engine.
      *