如何在laravel中获得具有角色的用户？

我有一个用户模型，它与角色模型有“多对多”的关系。 用户模型：

class User extends Model
{
    ...
    public function roles()
    {
        return $this->belongsToMany(Config::get('entrust.role'), Config::get('entrust.role_user_table'), 'user_id', 'role_id');
    }
}

我有一个用户控制器，它有一个获取JSON格式的用户数据的方法：

class UserController extends Controller {
    ...

    // GET /user/3
    public function show(User $user)
    {
        // $user is a single user
        // return single user's data without roles
        // I want to get user WITH roles
        return $user;
    }

    // GET /users
    public function index(User $user)
    {
        // returns list of users with roles.
        $user->with('roles')->get();
    }
}

方法

show（）

以JSON格式返回没有角色的用户数据。如何使用角色数据获取用户数据

对于用户列表（

index（）方法

），我可以使用

with（）

方法返回具有角色的用户，但我不知道如何在show（）方法中执行此操作

在
show（）中返回dd（$user）
方法输出：

User {#192 ▼
  #fillable: array:7 [▼
    0 => "name"
    1 => "email"
    2 => "password"
    3 => "username"
    4 => "first_name"
    5 => "last_name"
    6 => "is_guest"
  ]
  #hidden: array:2 [▼
    0 => "password"
    1 => "remember_token"
  ]
  #totalCount: null
  #connection: null
  #table: null
  #primaryKey: "id"
  #keyType: "int"
  #perPage: 15
  +incrementing: true
  +timestamps: true
  #attributes: array:11 [▼
    "id" => 11
    "username" => "some_username6"
    "email" => "email@example.com6"
    "password" => "$2y$10$h8mN6r8rWdiXv9VJG5z7NucaOrD9kEtfBSXnL6BdJGzV1671EkdaG"
    "name" => "some name6"
    "first_name" => "some_first_name6"
    "last_name" => "some_last_name6"
    "remember_token" => null
    "created_at" => "2016-09-02 19:14:46"
    "updated_at" => "2016-09-02 19:14:46"
    "is_guest" => 1
  ]
  #original: array:11 [▼
    "id" => 11
    "username" => "some_username6"
    "email" => "email@example.com6"
    "password" => "$2y$10$h8mN6r8rWdiXv9VJG5z7NucaOrD9kEtfBSXnL6BdJGzV1671EkdaG"
    "name" => "some name6"
    "first_name" => "some_first_name6"
    "last_name" => "some_last_name6"
    "remember_token" => null
    "created_at" => "2016-09-02 19:14:46"
    "updated_at" => "2016-09-02 19:14:46"
    "is_guest" => 1
  ]
  #relations: []
  #visible: []
  #appends: []
  #guarded: array:1 [▼
    0 => "*"
  ]
  #dates: []
  #dateFormat: null
  #casts: []
  #touches: []
  #observables: []
  #with: []
  #morphClass: null
  +exists: true
  +wasRecentlyCreated: false
}

可以对现有模型对象使用
load
函数来加载关系的数据

$user->load('roles')
return $user;

在显示方法中使用加载功能：

class UserController extends Controller 
{
    public function show(User $user)
    {
        return $user->load('roles');
    }

    public function index(User $user)
    {
        return $user->with('roles')->get();
    }
}

你可以简单地做

User::with('role')->get();

您是否在show（）方法中尝试了dd（$user）？那么它显示了什么呢？