如何訪問數據透視表列

Question

我有bican角色插件，我需要通過數據透視表訪問。這是在我的控制器代碼

$users = User::where('role_id','=',2)->get(); 

運動中的作用

Schema::create('roles', function (Blueprint $table) { 
     $table->increments('id')->unsigned(); 
     $table->string('name'); 
     $table->string('slug')->unique(); 
     $table->string('description')->nullable(); 
     $table->integer('level')->default(1); 
     $table->timestamps(); 
    }); 

遷移用戶

Schema::create('users', function (Blueprint $table) { 
     $table->increments('id'); 
     $table->string('name')->unique(); 
     $table->string('email')->unique(); 
     $table->rememberToken(); 
     $table->timestamps(); 
    }); 

樞遷移

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

Answer 1

如果用戶和角色之間的關係是多對一那麼它就是很多看起來你正在查詢User不正確。正確的查詢會像：

$users = User::whereHas('roles', function($q) { 
        $q->where('role_id', 2); 
       }) 
       ->get(); 

然後你就可以得到用戶的角色爲：

foreach($users as $user) { 
    $user->roles; // returns collection of roles 
}