Question

我正在为Laravel 4创建简单的信使，其功能与Facebook信使非常相似。我有问题使用Eloquent查询列出当前登录用户的线程的最新消息。

考虑我有以下用于Messenger的数据库表（还有用户表）：

+-----------+ +--------------+ +----------------+ +----------------+ +-----+ 
|threads    | |thread_users  | |messages        | |messages_status | |users|
+-----------+ +--------------+ +----------------+ +----------------+ +-----+
|id         | |id            | |id              | |id              | |id   |
|title      | |thread_id     | |thread_id       | |user_id         | |name |
|created_at | |user_id       | |sender_id (user)| |message_id      | +-----+
|deleted_at | |created_at    | |content         | |deleted_at      |
+-----------+ |deleted_at    | |created_at      | +----------------+
              +--------------+ +----------------+

数据库说明：

当用户写第一条消息时，他会创建线程。添加到线程的所有用户都列在thread_users表中。提交给线程的消息存储在消息表中，消息表链接到messages_status表，如果用户从线程中删除了特定消息，我将存储信息。

Laravel模型（我已删除SoftDeletingTrait以明确说明）：

class threads extends \Eloquent {
     protected $table = 'threads';

     public function participants() {
         return $this->hasMany('messengerThreadUsers', 'thread_id', 'id');
     }

     public function userParticipation() {
         return $this->hasOne('threadUsers', 'thread_id', 'id')->where('user_id', '=', Auth::user()->id);
     }

     public function messages() {
         return $this->hasMany('message', 'thread_id', 'id');
     }

     public function lastMessage() {
         return $this->hasOne('message', 'thread_id', 'id')->latest();
     }
}

class threadUsers extends \Eloquent {
     protected $table = 'thread_users';
}

class message extends \Eloquent {
     protected $table = 'messages';

     public function statuses() {
         return $this->hasMany('messageStatus', 'message_id', 'id');
     }

     public function thread() {
         return $this->hasOne('threads', 'id', 'thread_id');
     }
}

class messageStatus extends \Eloquent {
     protected $table = 'messages_status';

     public function message() {
         return $this->hasOne('message', 'id', 'message_id');
     }

     public function thread() {
         return $this->hasOne('threads', 'id', 'thread_id');
     }
}

现在我想查询返回5条最新消息（按消息创建日期排序）和线程，对于当前登录的用户，但message_status.deleted_at为NULL。

到目前为止，我已经得到了这个：

$this->threads->select(\DB::raw('threads.*'))
     ->with('lastMessage')
     ->has('userParticipation')
     ->join('messages', 'messages.thread_id', '=', 'threads.id')
     ->orderBy('messages.created_at', 'DESC')
     ->paginate(5);

但它不断回复我的重复线程。在DB中我有2个线程：

线程＃1中有2条消息
线程＃2中有1条消息

输出如下：

  0 => 
    array (size=5)
      'id' => int 10
      'title' => string 'THREAD 1' (length=8)
      'deleted_at' => null
      'created_at' => string '2015-07-06 14:20:03' (length=19)
      'last_message' => 
        array (size=7)
          'id' => int 11
          'sender_id' => int 12
          'thread_id' => int 10
          'content' => string 'MSG 1 in thread 1' (length=129)
          'created_at' => string '2015-07-07 19:36:52' (length=19)
  1 => 
    array (size=5)
      'id' => int 10
      'title' => string 'THREAD 1' (length=8)
      'deleted_at' => null
      'created_at' => string '2015-07-06 14:20:03' (length=19)
      'last_message' => 
        array (size=7)
          'id' => int 11
          'sender_id' => int 12
          'thread_id' => int 10
          'content' => string 'MSG 1 in thread 1' (length=129)
          'created_at' => string '2015-07-07 19:36:52' (length=19)
  2 => 
     array (size=5)
      'id' => int 10
      'title' => string 'THREAD 2' (length=8)
      'deleted_at' => null
      'created_at' => string '2015-07-06 14:25:13' (length=19)
      'last_message' => 
        array (size=7)
          'id' => int 11
          'sender_id' => int 12
          'thread_id' => int 10
          'content' => string 'MSG 1 in thread 2' (length=129)
          'created_at' => string '2015-07-07 19:56:22' (length=19)

Laravel：ORM检索按相关表排序的数据

0 个答案: