Laravel 中利用『模型事件』来实现删除数据时的连带删除

class WheelActivity extends Model
{
    public function awards() {
        return $this->hasMany('App\Model\WheelAward', 'wheel_activity_id', 'id');
    }

    protected static function boot()
    {
        parent::boot();

        static::deleting(function($wheelactivity){
            $wheelactivity->awards()->delete();
        });
    }

    **注：** 在控制器中删除时必须使用first()查询，否则无效。
    example：WheelActivity::where('id', $id)->first()->delete()；
}Copy

    $user = User::find($id);
    $user->photos()->delete();   //  删除关联表的数据
    $user->delete();             //  删除主表数据Copy

    public function boot()
    {
        WheelActivity::deleting(function($wheelactivity){
            $wheelactivity->awards()->delete();
        });
    }Copy