laravel 1对多，主键不是整型的坑

 1    namespace App\Http\Model;
 2 
 3 
 4     class Order extends BaseModel
 5     {
 6         protected $primaryKey="order_id";
 7         public $incrementing = false;
 8         protected $keyType="string";
 9         //
10         public function orderItem(){
11             return  $this->hasMany(‘App\Http\Model\OrderItems‘);
12         }
13     }

1 $list=Order::find("A2018113017461822785")->orderItem;