Laravel 混合获取 Eloquent 急切加载嵌套多个模型

Posted 2023-03-22

【中文标题】Laravel 混合获取 Eloquent 急切加载嵌套多个模型

【英文标题】：Laravel mixed get Eloquent eager loading nested with multiple models

【发布时间】：2019-05-19 19:41:39

【问题描述】：

场景是：我有一个用户模型、一个角色模型和一个具有多对多和一对多关系的权限模型。

用户模型（可以看到角色一对多关系，权限多对多关系）：

<?php

namespace App\Models;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable

    // ------------------------------------------------------------------------------
    // Model Traits
    // ------------------------------------------------------------------------------
    use Notifiable;

    // ------------------------------------------------------------------------------
    // Model configuration (extended from parent)
    // ------------------------------------------------------------------------------
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password',
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token'
    ];

    /**
     * The attributes that should be eager loaded.
     *
     * @var array
     */
    protected $with = ['role', 'permissions'];

    // ------------------------------------------------------------------------------
    // Model Relationships
    // ------------------------------------------------------------------------------
    public function role() 
        return $this->belongsTo('App\Models\Role');
    

    public function permissions() 
        return $this->belongsToMany('App\Models\Permission');
    

榜样：

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use GeneaLabs\LaravelModelCaching\Traits\Cachable;

class Role extends Model

    use Cachable;

    protected $with = ['permissions'];

    // ------------------------------------------------------------------------------
    // Model Relationships
    // ------------------------------------------------------------------------------
    public function users() 
        return $this->hasMany('App\Models\User');
    

    public function permissions() 
        return $this->belongsToMany('App\Models\Permission');
    

权限模型：

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use GeneaLabs\LaravelModelCaching\Traits\Cachable;

class Permission extends Model

    use Cachable;
    // ------------------------------------------------------------------------------
    // Model configuration (extended from parent)
    // ------------------------------------------------------------------------------
    /**
     * Campos autorellenables para la generación automática de modelos
     */
    protected $fillable = ['name'];

    // ------------------------------------------------------------------------------
    // Model Relationships
    // ------------------------------------------------------------------------------
    public function users() 
        return $this->belongsToMany('App\Models\User');
    

    public function roles() 
        return $this->belongsToMany('App\Models\Permission');
    

如果我调用User::with(['role', 'permissions'])->get() 甚至User::with(['role.permissions', 'permissions'])->get()，我会得到用户数据、角色数据和权限数据。一切都很好，除了永远不会加载角色权限。因此，如果不为此用户角色权限添加另一个查询，我将无法与他们合作。

我知道该角色具有权限，因为当我执行Role::where('id', 3)->with('permissions')->get();时，该关系有效并且具有权限数据。

我做错了什么？

我的数据库表是：users、permissions、roles、permission_role 和 permission_user。

编辑 - 这是我从语句中得到的结果：

[
  
    "id": 1,
    "role_id": 3,
    "name": "UserName",
    "email": "[e-mail]",
    "email_verified_at": null,
    "created_at": "2018-12-10 13:04:00",
    "updated_at": "2018-12-10 13:04:00",
    "role": 
      "id": 3,
      "name": "Editor",
      "created_at": "2018-12-10 13:03:31",
      "updated_at": "2018-12-10 13:03:31",
      "permissions": []
    ,
    "permissions": [
      
        "id": 3,
        "name": "Delete post",
        "created_at": "2017-10-23 11:07:43",
        "updated_at": "2017-10-23 11:07:43",
        "pivot": 
          "user_id": 1,
          "permission_id": 3
        
      
    ]
  
]

如您所见，该角色的权限为空。

【问题讨论】：

您是否需要一个“hasManyThrough”关系？一个用户通过一个角色有很多权限？

【参考方案1】：

我自己解决了。这是缓存模型的问题。刷新缓存php artisan cache:clear解决了。