izyim-api/app/Decisionitem.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class DecisionItem extends Model
{
    protected $fillable = [
        'id',
        'decision_id',
        'warehouseitem_id',
        'num_of_item',
    ];

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