added removeChild func to Migration class

README.md

@@ -220,7 +220,8 @@ To be able create the migrations, you need to add the following code to your con
 8. `updateRule()`: updating a rule
 9. `removeRule()`: removing a rule
 10. `addChild()`: creating a child
-11. `assign()`: assign a role to a user
+12. `removeChild()`: removing a child
+13. `assign()`: assign a role to a user
 
 
 ###Creating Migrations

migrations/Migration.php

@@ -257,6 +257,26 @@ protected function addChild($parent, $child)
         echo ' done (time: ' . sprintf('%.3f', microtime(true) - $time) . "s)\n";
     }
 
+    /**
+     * Removes child.
+     *
+     * @param Item|string $parent Either name or Item instance which is parent
+     * @param Item|string $child Either name or Item instance which is child
+     */
+    protected function removeChild($parent, $child)
+    {
+        if (is_string($parent)) {
+            $parent = $this->findItem($parent);
+        }
+        if (is_string($child)) {
+            $child = $this->findItem($child);
+        }
+        echo "    > removing $child->name from $parent->name ...";
+        $time = microtime(true);
+        $this->authManager->removeChild($parent, $child);
+        echo ' done (time: ' . sprintf('%.3f', microtime(true) - $time) . "s)\n";
+    }
+
     /**
      * Assigns a role to a user.
      *