/home/optimumoperation/moderncms.optimumoperations.top/core/app/ArticleCategory.php
<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class ArticleCategory extends Model
{
  public function articles() {
    return $this->hasMany('App\Article');
  }
}
Path: home/optimumoperation/moderncms.optimumoperations.top/core/app