Treinamento

Model Course

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Course extends Model
{

    public $table = 'courses';

    public function user()
    {
        return $this->belongsToMany('App\User');
    }

    public function order()
    {
        return $this->belongsToMany(Order::class);
    }
}

Model Order

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Order extends Model
{
    public function user()
    {
        return $this->belongsTo('App\User');
    }

    public function course()
    {
        return $this->belongsToMany(Course::class);
    }
}