如何使用CakePHP 3连接多个表？

Question

我正在使用CakePHP 3.x.

我想要的是能够调用$ this-> Categories-> find()然后加入Topics.cat_id = Categories.id上的主题,然后加入Posts.topic_id = Topics.id上的帖子.

我没有得到任何错误,但我收到的唯一数据是类别数据,我尝试过LEFT和INNER加入但没有成功.任何帮助将不胜感激.

表关系是:

CategoriesTable

$this->hasMany('Topics');

TopicsTable

$this->belongsTo('Categories');
$this->hasMany('Posts');

PostsTable

$this->belongsTo('Topics');

还有我的查询:

$query = $this->Categories->find('all')
        ->order(['Categories.name' => 'ASC'])
        ->join([
            'topics' => [
                'table' => 'Topics',
                'type' => 'LEFT',
                'conditions' => 'topics.Cat_id = Categories.id'
            ],
            'posts' => [
                'table' => 'Posts',
                'type' => 'LEFT',
                'conditions' => 'posts.topic_id = topics.id'
            ]
        ]);

尝试使用可包含的行为但现在我使用此查询得到错误"类别与帖子无关":

$query = $this->Categories->find('all')
        ->order(['Categories.name' => 'ASC'])
        ->contain(['Topics', 'Posts' => function($q){
            return $q->where(['Posts.topic_id' => 'Topics.id']);
        }]);

Answer 1

根据@ndm给出的建议,我能够得到我想要的结果.我一定忽略了文档中的部分,所以其他人都有这个问题,这里是如何做到的.

$query = $this->Categories->find('all')
        ->order(['Categories.name' => 'ASC'])
        ->contain([
            'Topics.Posts.Users'
        ]);