willaengine/app/OrderItem.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class OrderItem extends Model
{

    protected $fillable = ['order_id', 'shipping_method_id','quantity','payable_id','payable_type', 'price', 'details', 'auction_id', 'gift_id'];

    public function auction()
    {
        return $this->belongsTo('App\Auction');
    }

    public function business_item_variation()
    {
        return $this->belongsTo('App\BusinessItemVariation');
    }

    public function order()
    {
        return $this->belongsTo('App\Order');
    }

    public function getCreatedAtAttribute($date)
    {
        return \Morilog\Jalali\jDate::forge($date)->format('datetime');
    }

    public function setDetailsAttribute($value)
    {
        $this->attributes['details'] = json_encode($value, JSON_UNESCAPED_UNICODE);
    }

    public function getDetailsAttribute()
    {
        return json_decode($this->attributes['details']);
    }

    public function getAllPriceAttribute()
    {
        return $this->attributes['price'] * $this->attributes['quantity'];
    }

    public function payable()
    {
        return $this->morphTo();
    }
}