diff --git a/src/Database/Relations/AttachOneOrMany.php b/src/Database/Relations/AttachOneOrMany.php
index d3d80a883..6901ea613 100644
--- a/src/Database/Relations/AttachOneOrMany.php
+++ b/src/Database/Relations/AttachOneOrMany.php
@@ -404,6 +404,15 @@ public function makeValidationFile($value)
         return $value;
     }
 
+    /**
+     * getRelatedKeyName
+     * @return string
+     */
+    public function getRelatedKeyName()
+    {
+        return $this->related->getKeyName();
+    }
+
     /**
      * @deprecated use getForeignKeyName
      */