willaengine/app/SpFrameType.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class SpFrameType extends Model{

    public $timestamps = false;

    public function dependent_page()
    {
    	return $this->belongsTo('App\\SpPageType',  'dependent_page_type_id');
    }

    public function getFrameInfoFormAttribute($value)
    {
        return json_decode($value, true);
    }

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