CakePHP:连接内部包含


CakePHP: joins inside contain

正如标题所说,我在查找查询中遇到了连接问题,错误出现如下:

  preg_match() expects parameter 2 to be string, array given [CORE/cake/libs/model/behaviors/containable.php, line 301]

我试过将joins添加到那边的数组中,但它没有改变任何东西。

这些是我传递给find方法的选项。

$options = array(
   'contain' => array(
      'Answer' => array(
         'conditions' => array('Answer.type' => 'answer'),
         'joins' => array(
            $this->votesJoin()
         ),
         'Comment' => array(
            'conditions' => array('Comment.type' => 'comment'),
            'joins' => array(
               $this->votesJoin()
            )
         )
      ),
      'Comment' => array(
         'conditions' => array('Comment.type' => 'comment'),
         'joins' => array(
            $this->votesJoin()
         )
      ),
      'User',
      'Tag' => array()
   ),
   'joins' => array(
      $this->votesJoin()
   ),
   'conditions' => array(
      'Question.id' => $id
   )
);
return $this->find('first', $options);

votesJoin()返回以下数组。

(
   [table] => (SELECT Vote.node_id, SUM(value) as total FROM votes AS `Vote`   WHERE 1 = 1  GROUP BY `Vote`.`node_id`  )
   [alias] => Vote
   [conditions] => Vote.node_id = Question.id
)

我要做的是:每个用户都可以对一个节点(问题/答案/评论)进行上/下投票。在join中,我试图将这些投票的总和相加。数据库http://github.com/navale/QA/wiki/img/datamodel.png

你应该使用"join "只用于那些不能用Cake模型关系和Containable完成的事情。我不知道你们数据库的细节,但是我认为查找操作可以简化。你为什么不把这些表的模式贴在这里呢?

试试这个:

$options = array(
'contain' => array(
  'Answer' => array(
     'conditions' => array('Answer.type' => 'answer'),
     'Vote' => array(
        'fields' => array('SUM(Vote.value)'),
        'group'  => array('Vote.parent_id')
     ),
     'Comment' => array(
        'conditions' => array('Comment.type' => 'comment'),
        'Vote' => array(
                        'fields' => array('SUM(Vote.value)'),
                        'group'  => array('Vote.parent_id')
                 )
     )
  ),
  'Comment' => array(
     'conditions' => array('Comment.type' => 'comment'),
     'Vote' => array(
        'fields' => array('SUM(Vote.value)'),
        'group'  => array('Vote.parent_id')
     )
  ),
  'User',
  'Tag' => array()

),'conditions' => array("的问题。Id ' => $ Id)

);

您将获得每个答案、评论和对答案的评论的投票总和值。(如果你还没有这样做,你可能需要在Node模型中添加'hasMany' Vote)

如果你想获得一个问题的总票数,那么我建议:获取问题的答案和评论列表:

$ lvl1 =找到("列表","字段"=>数组(id),"条件"=>数组(' Node.parent_id ' => id)美元)

然后得到答案的评论列表

$ lvl2 =找到("列表","字段"=>数组(id),"条件"=>数组(' Node.parent_id ' => lvl1)美元)

然后将两个数组合并然后对其求和