c-cms-legacy/app/OCOM.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class OCOM extends Model
{
    public function courses()
    {
        $courses_id = explode(',',$this->course_id);
        $courses = collect();
        foreach ($courses_id as $course_id)
        {
            $courses->push(\App\Course::find($course_id));
        }
        return $courses;
    }

    public function saveCourses($courses)
    {
        $courses_id = [];
        foreach ($courses as $cours)
        {
            if ($cours != null){
                array_push($courses_id,$cours->id);
            }
        }
        $this->course_id = implode(',',$courses_id);
        $this->save();
    }
}