Laravel 4.2多对多关系:无法从数据透视表中读取

Question

我试图将Jeffrey Way的多对多关系教程应用到我的私人消息应用程序中,但我被卡住了.我正在尝试进行2次对话,haha并且hehe与用户相关联.但是,Laravel给了我错误:

Column not found: 1054 Unknown column 'Conversations.user_id' in 'where clause' (SQL: select * from `Conversations` where `Conversations`.`user_id` = 1)

我在对话表中有这些数据:

+---------+----------+
| conv_id | name     |
+---------+----------+
|       1 |     haha |
|       2 |     hehe |
+---------+----------+

在我的user_conversations表中:

+----+-------------+--------+
| id | conv_id     | user_id|
+----+-------------+--------+
|  1 |           1 |      1 |
|  2 |           2 |      1 |
+----+-------------+--------+

我试过:在控制器中:

用户:return $this->belongsToMany('User','id');

对话:return $this->hasMany('Conversations','conv_id');

但我得到的结果是:haha而不是haha和hehe

我也尝试过:

用户:return $this->belongsToMany('User','user_conversations');

对话:return $this->hasMany('Conversations','user_conversations');

但laravel给我发了以下错误:

Column not found: 1054 Unknown column 'Conversations.user_conversations' in 'where clause' (SQL: select * from `Conversations` where `Conversations`.`user_conversations` = 1)

我在Laravel还是比较新的,所以我可能会犯一些愚蠢的错误.

---

这是我的代码:

模型

对话

class Conversations extends Eloquent  {

    protected $table = 'Conversations';

    protected $fillable = array('name');

    public function users(){
        return $this->belongsToMany('User');
    }

}

用户

<?php

use Illuminate\Auth\UserInterface;
use Illuminate\Auth\Reminders\RemindableInterface;

class User extends Eloquent implements UserInterface, RemindableInterface {

    ....

    public function conversations(){
        return $this->hasMany('Conversations');
    }
}

CONTROLLERS

对话控制器

public function create()
    {
        $loginuser = User::find(Auth::user()->id);
        $conversations = $loginuser->conversations;
        return View::make('msgsystem.Conversations.Conversations',array('conversations'=>$conversations));
    }

移民(在功能上升())

用户

Schema::create('users',function($table)
        {
            $table->increments('id');
            $table->string('email')->unique();
            $table->string('password',100);
            $table->string('name',150);
            $table->string('usertype',50);
            $table->boolean('block');
            $table->string('remember_token',100);
            $table->timestamp('lastlogin_at');
            $table->timestamps();
            $table->softDeletes();
        });

对话

Schema::create('Conversations', function(Blueprint $table)
        {
            $table->increments('conv_id')->index();
            $table->string('name',100);
            $table->timestamps();
        });

user_conversations

Schema::create('user_conversations', function(Blueprint $table)
        {
            $table->increments('id')->unsigned();
            $table->integer('conversation_id')->unsigned()->index();
            $table->foreign('conversation_id')->references('conv_id')->on('conversations')->onDelete('cascade');
            $table->integer('user_id')->unsigned()->index();
            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
            $table->timestamps();
        });

---

改善代码的奖励点.非常感谢你!

Answer 1

在您的多对多关系的示例中,用户可以进行多次对话,其中对话也可以由许多用户共享.

在这种情况下,我们需要将该belongsToMany()方法用于用户模型上的关系和对话模型上的逆.

class User 
{
    public function conversations()
    {
        return $this->belongsToMany('Conversations');
    }
}



class Conversations 
{
    public function users()
    {
        return $this->belongsToMany('User');
    }
}

如果需要为数据透视表使用不同的名称,或覆盖关联的键,则可以将它们作为可选参数传递.

return $this->belongsToMany(
   'Conversations',          // related_table
   'user_conversations',     // pivot_table
   'user_id',                // key_1
   'conversations_id'        // key_2
);