Cakephp 如何根据条件删除子记录？

Question

我在模型中通过 hasMany

链接了 2 tables "Topic" 和 "Post"

我想删除 ID = 3 的 Post 条目，因为它没有消息。

在 table "Post" 的模型中，我有这个 "beforeSave" :

public function beforeSave($options = array()) {

  if ($this->data['Post']['message'] == '') {
    CODE TO DELETE HERE
  }
}

这是我的 $this->request->data :

Array
(
[Topic] => Array
(
    [id] => 1
    [topic_title] => This is my topic
)

[Post] => Array
(
    [1] => Array
        (
            [id] => 1
            [title] => Blah
            [message] => My message
        )

    [2] => Array
        (
            [id] => 2
            [title] => Second Blah
            [message] => Second My message
        )
    [3] => Array
        (
            [id] => 3
            [title] => Second Blah
            [message] => 
        )
    )
)

我不知道如何在模型中删除或者这是错误的方法吗？

我现在也在 saveAssociated 之前在控制器中尝试过这个：

$this->loadmodel('Post');

foreach ($this->request->data['Post'] as $i => $post) {

 if ($post['message'] == '') {
     unset($this->request->data['Post'][$i]);

     $options = array( 'conditions' => array( 'Post.id' => $i) );
     $this->Post->find('first', $options);

     if ($this->Post->delete()) {
      echo "Post id : " . $i . ' - Deleted';
    } else {
      echo "Post id : " . $i . ' - Not deleted';
    }
 }

}

这给了我 "Post id xxx Deleted" 但是 Post 记录没有被删除。

Answer 1

如果消息为空，您可以取消设置 beforeSave 中的数据，如下所示：

public function beforeSave($options = array()) {

    foreach ($this->data['Post'] as $i => $post) {
        if ($post['message'] == '') {
            unset($this-data['Post'][$i]);
        }
    }
}

Answer 2

由于我正在使用 "saveAssociated" 我还必须 "unset" "$this->request->data" 中的 post 否则它会被再次保存。

$this->loadmodel('Post');

foreach ($this->request->data['Post'] as $i => $post) {

 if ($post['message'] == '') {
   unset($this->request->data['Post'][$i]);

 if ($this->Post->delete($post['id'], false)) {
  echo "Post id : " . $i . ' - Deleted';
 } else {
  echo "Post id : " . $i . ' - Not deleted';
 }
}