Loading relations based on condition in laravel

Hy all I am a beginner in laravel.I am having trouble with loading relation based on a condition.

There is three tables picture, videos, and order.

order table contains the following fields

1.type => 0 or 1 (photo or video)

2.type_id

Order table contains the following relations

public function pictures()
{
   return $this->hasMany('App\Pictures','id', 'type_id);
}
public function videos()
{
   return $this->hasMany('App\Videos', 'id', 'type_id');
}

I want to load picture relation with order only if type equals 0 and video if the type is 1. Please help

via Chebli Mohamed