cssd-back/app/Input.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Input extends Model
{
    public $fillable = ['name','type','size','test_type_id','parent_id'];
    public function test_type()
    {
        return $this->belongsTo('App\TestType');
    }
    public function parent()
    {
        return $this->belongsTo('App\Input', 'parent_id');
    }
    public function children()
    {
        return $this->hasMany('App\Input', 'parent_id');
    }
    public function options()
    {
        return $this->hasMany('App\Option');
    }
}