Laravel 5.1属于许多无法正常工作

Question

我有下表。

用户数

ID

名称

大事记

ID

名称

牌

ID

名称

转账

ID

event_id

card_id

我在Card.php和Event.php中添加了归属关系

class Card extends Model
{
 public function user()
    {
        return $this->belongsTo(User::class);
    }

     public function events()
    {
        return $this->belongsToMany(Event::class,'transfers');
    }


}

class Event extends Model
{
        use SoftDeletes;

        protected $dates = ['deleted_at'];


    public function user()
    {
        return $this->belongsTo(User::class);
    }
    public function cards()
    {
        return $this->belongsToMany(Card::class,'transfers');
    }





}

我试图在控制器中使用以下语句，它们均返回错误

> echo count($user->events->cards->where([['id', '=',
> '57']])->find());die; //$cards is not defined.


> echo count($user->events->cards()->where([['id', '=',
> '57']])->find());die; // method cards() is not defined.I tried this after reading a tutorial

感谢您对解决此问题的任何帮助。

提前致谢。

Answer 1

通过使用hadManyThrough关系，可以使您的生活更加轻松：

class User extends Model {
     public function cards() {
          return $this->hasManyThrough(Card::class, Event::class);
     }    
} 

然后原则上您可以执行以下操作：

$user->cards()->where(['id', '=', '57']);