<?php namespace App; use Illuminate\Database\Eloquent\Model; class RoleModuleAssociation extends Model { protected $fillable = ['module_id', 'sub_module_id', 'display_order']; // Add display_order to fillable public function module(){ return $this->belongsTo('\App\Module'); } public function sub_module(){ return $this->belongsTo('\App\SubModule'); } }