izyim-api/app/So.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class So extends Model
{
     protected $fillable = [
        'ff_id',
        'supplier_company_name',
        'supplier_contact_person',
        'supplier_contact_person_no',
        'delivery_id',
        'warehouse_id',
    ];

    public function Soitem()
    {
        return $this->hasMany(Soitem::class);
    }

}