显示使用CakePHP连接到另一个表的记录列表

我有一个存储帖子和主题的应用程序,并使用Topic_Posts表连接它们.

申请的协会如下：

Post.PHP
class Post extends AppModel
{
    public $name = 'Post';

    public $belongsTo = 'User';

    public $hasMany = array('Answer');

    // Has many topics that belong to topic post join table... jazz
    public $hasAndBelongsToMany = array(
        'Topic' => array('with' => 'TopicPost')
    );
}

Topic.PHP
class Topic extends AppModel
{
    public $hasMany = array(
        'TopicPost'
    );
}

TopicPost.PHP
class TopicPost extends AppModel {
    public $belongsTo = array(
        'Topic','Post'
    );
}

当用户查看主题时,例如/ topics / view / topicname我想显示包含该主题的所有帖子.

到目前为止,我在我的TopicsController中为视图提供了以下方法：

public function view ( $slug )
{
    $topic = $this->Topic->find('first',array('conditions'=>array('Topic.slug'=>$slug)));
    $this->set('topic',$topic);
    $this->set('title_for_layout',$topic['Topic']['title'] . ' – Topics');

    $this->paginate = array
    (
        'Post' => array
        (
            'limit'=>15,'conditions'=>array
            (
                'Post.status'=>array(1,2),'TopicPost.topic_id' => $topic['Topic']['id'],),'order'=>array('Post.datetime'=>'desc'),'contain'=>array('User'=>'Profile','TopicPost')
        )
    );

    $posts = $this->paginate('Post'); // this one

    $this->set('posts',$posts);

}

所以我可以使用Posts和TopicPosts添加：public $uses = array(‘Topic’,’TopicPost’,’Post’);到控制器的顶部,使所有模型都可以包含.

所以基本上我需要找到在数据库模型TopicPosts中匹配的帖子,用于我正在查看的主题的id.

解决方法

我无法让它以“正确”的方式工作.我不确定这是不是蛋糕或其他东西的错误,但分页功能只是拒绝让步..正确的方法可能是在你的Post模型中编写自己的paginate函数,有一些信息如何在食谱中做到这一点.

同时,我为您提供以下解决方法.它不是最优的(至少不是没有缓存)但它有效.如果遇到性能问题,可以以正确的方式执行此操作,但在此之前,下面的代码应该执行此操作.

public function view ( $slug )
{
    $topic = $this->Topic->find('first',$topic['Topic']['title'] . ' – Topics');

    // step 1: get post IDs related to your topic
    $postIDs = $this->Topic->TopicPost->find
        (
            'list',array
            (
                'fields'        => array('TopicPost.post_id'),'conditions'    => array('TopicPost.topic_id' => $topic['Topic']['id'])
            )
        );

    $this->paginate = array
    (
        'Post' => array
        (
            'limit'=>15,'conditions'=>array
            (
                'Post.status' => array(1,// step 2: include them in your paginate conditions
                'Post.id' => $postIDs,'order' => array('Post.datetime'=>'desc'),)
    );

    $posts = $this->paginate('Post');

    $this->set('posts',$posts);
}

(请注意我在我的测试中删除了一些东西,因为我的应用程序中没有一些东西,所以不要忘记把它放回去)