Ticket #9471: _relocate_children.diff

wp-includes/post.php

@@ -2555 +2555 @@
 
         clean_post_cache($post_ID);
 
+        if ( isset($post_parent) && $post_parent < 0 )
+                add_post_meta($post_ID, '_wp_attachment_temp_parent', $post_parent, true);
+
         if ( $update) {
                 do_action('edit_attachment', $post_ID);
         } else {

wp-admin/includes/post.php

@@ -759 +759 @@
         global $wpdb;
         $old_ID = (int) $old_ID;
         $new_ID = (int) $new_ID;
-        return $wpdb->update($wpdb->posts, array('post_parent' => $new_ID), array('post_parent' => $old_ID) );
+        
+        $children = $wpdb->get_col("
+                SELECT post_id
+                FROM $wpdb->postmeta
+                WHERE meta_key = '_wp_attachment_temp_parent'
+                AND meta_value = $old_ID
+        ");
+
+        foreach ( $children as $child_id ) {
+                $wpdb->update($wpdb->posts, array('post_parent' => $new_ID), array('ID' => $child_id) );
+                delete_post_meta($child_id, '_wp_attachment_temp_parent');
+        }
 }
 
 /**