Drupal 7的孤儿节点引用时删除节点

Question

我有2个节点：

• 项目
• 错误

一期工程已到错误

当我删除错误的节点引用，那些节点引用仍然是孤立的。什么是最好的清理方法？

UPDATE（这里是我做的）

function dc_project_management_node_delete($node) 
{ 
    if ($node->type == 'bug_request') 
    { 
     $bug_request_nid = $node->nid; 
     $milestone_ids = db_query('SELECT entity_id FROM {field_data_field_bugs_requests} WHERE field_bugs_requests_nid = :bug_request_nid', array(':bug_request_nid' => $bug_request_nid))->fetchCol(); 
     $milestones = entity_load('field_collection_item', $milestone_ids); 

     foreach($milestones as $milestone) 
     { 
      for($k=0;$k<count($milestone->field_bugs_requests['und']);$k++) 
      { 
       if ($milestone->field_bugs_requests['und'][$k]['nid'] == $bug_request_nid) 
       { 
        unset($milestone->field_bugs_requests['und'][$k]); 
       } 
      } 

      entity_save('field_collection_item', $milestone); 
     } 
    } 
} 

Answer 1

如果你想排序（当一个项目被删除，即相关的错误都将被删除），你可能只是这样做的引用完整性：

function mymodule_node_delete($node) { 
    if ($node->type == 'project') { 
    $bug_nids = array(); 
    foreach ($node->field_bugs[LANGUAGE_NONE] as $bug) { 
     $bug_nids[] = $bug['nid']; 
    } 

    node_delete_multiple($bug_nids); 
    } 
}