【发布时间】：2015-10-16 00:17:32
【问题描述】：
我有三个表（instances、users、user_instance）。每个用户都可以分配给一个实例。一个实例可以有许多不同的用户。
我尝试使用 Laravel 5.1 Eloquent 和 belongsTo() 函数，通过调用 $this->user->instance->instance_id 从分配给特定用户的实例中获取 instance_id。
无论我尝试了什么，我的 AuthController.php 中总是得到 NULL 结果：
数据库架构：
mysql> show columns from instances;
+------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------+------------------+------+-----+---------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| name | varchar(150) | NO | | NULL | |
| key | varchar(150) | NO | | NULL | |
| created_at | int(11) | NO | | NULL | |
| updated_at | int(11) | NO | | NULL | |
+------------+------------------+------+-----+---------+----------------+
mysql> show columns from users;
+----------------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------+---------------------+------+-----+---------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| first_name | varchar(50) | YES | | NULL | |
| last_name | varchar(50) | YES | | NULL | |
| email | varchar(100) | NO | | NULL | |
| password | varchar(255) | NO | | NULL | |
| salt | varchar(255) | YES | | NULL | |
| remember_token | varchar(255) | YES | | NULL | |
| created_at | int(10) unsigned | NO | | NULL | |
| updated_at | int(10) | NO | | NULL | |
| last_login | int(10) unsigned | YES | | NULL | |
| ip_address | varchar(15) | NO | | NULL | |
| timezone | int(10) | YES | | NULL | |
| active | tinyint(1) unsigned | YES | | NULL | |
+----------------+---------------------+------+-----+---------+----------------+
mysql> show columns from user_instance;
+-------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+------------------+------+-----+---------+----------------+
| id | int(10) unsigned | YES | PRI | NULL | auto_increment |
| user_id | int(10) unsigned | NO | | NULL | |
| instance_id | int(10) unsigned | NO | | NULL | |
| created_at | int(11) | NO | | NULL | |
| updated_at | int(11) | NO | | NULL | |
+-------------+------------------+------+-----+---------+----------------+
App/Controllers/AuthController.php
<?php
use App\Models\User;
use App\Models\Instance;
use App\Models\User_Instance;
class AuthController extends Controller {
...
die($this->user->instance); // Returns: NULL
...
}
?>
App/Models/Instance.php
<?php namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Instance extends Model
{
/**
* Indicates if the model should be timestamped.
*
* @var bool
*/
public $timestamps = true;
/**
* The database table used by the model.
*
* @var string
*/
protected $table = 'instances';
/**
* The tables primary key.
*
* @var string
*/
protected $primaryKey = 'id';
/**
* The attributes that are mass assignable.
*
* @var array
*/
protected $fillable = ['name', 'key', 'created_at', 'updated_at'];
/**
* The attributes excluded from the model's JSON form.
*
* @var array
*/
protected $hidden = [];
}
?>
App/Models/User_Instance.php
<?php namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class User_Instance extends Model
{
/**
* Indicates if the model should be timestamped.
*
* @var bool
*/
public $timestamps = true;
/**
* The database table used by the model.
*
* @var string
*/
protected $table = 'user_instance';
/**
* The tables primary key.
*
* @var string
*/
protected $primaryKey = 'id';
/**
* The attributes that are mass assignable.
*
* @var array
*/
protected $fillable = ['user_id', 'instance_id', 'created_at', 'updated_at'];
/**
* The attributes excluded from the model's JSON form.
*
* @var array
*/
protected $hidden = [];
}
?>
App/Models/User.php
<?php namespace App\Models;
use Illuminate\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Auth\Passwords\CanResetPassword;
use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
use Illuminate\Contracts\Auth\CanResetPassword as CanResetPasswordContract;
use Zizaco\Entrust\Traits\EntrustUserTrait;
class User extends Model implements AuthenticatableContract, CanResetPasswordContract
{
use Authenticatable, CanResetPassword, EntrustUserTrait;
/**
* Indicates if the model should be timestamped.
*
* @var bool
*/
public $timestamps = true;
/**
* The database table used by the model.
*
* @var string
*/
protected $table = 'users';
/**
* The tables primary key.
*
* @var string
*/
protected $primaryKey = 'id';
/**
* The attributes that are mass assignable.
*
* @var array
*/
protected $fillable = [
'first_name',
'last_name',
'email',
'password',
'salt',
'remember_token',
'created_at',
'updated_at',
'last_login',
'ip_address',
'timezone',
'active'
];
/**
* The attributes excluded from the model's JSON form.
*
* @var array
*/
protected $hidden = ['password', 'remember_token'];
/**
* Map the instance with the user.
*
* @var int
*/
public function instance()
{
return $this->belongsTo('App\Models\User_Instance');
}
}
?>
【问题讨论】：
-
在用户模型中你有
instances()函数，而在AuthController 中你调用instance即没有's'。你能检查一下是错字还是什么..？ -
谢谢，我已经在描述中更新了。不幸的是，这并不能解决问题。
-
die($this->user->instance->instance_id);在此代码中$this->user将返回User的对象。然后你想让这个用户相关Instance。我的观点是您的User模型没有定义任何instance方法。 -
谢谢。我注意到 die(var_dump($this->user)) 不包含与“实例”相关的任何内容 - 这是正常行为吗？
-
你能告诉我什么 var_dump($this->user) 返回..？
标签： php mysql laravel laravel-5 eloquent