title: laravel relation owner model
body: <p>I have Table like</p>
  
  <pre><code>TABLE USERS
    id
    username
    email
    password
    created_at
    updated_at
    created_by
    updated_by
  </code></pre>
  
  <p>i want to select <code>users</code> and join with this user to get the username by foreign key with created_by</p>
  
  <p>Model Users</p>
  
  <pre><code>class users extends Model
  {
    protected $table = 'users';
  
    public function user()
    {
       return $this-&gt;belongTo('App\Users','created_by');
    }
  }
  </code></pre>
  
  <p>I want to know the user who created this user. I store users id on column created_by.</p>
  
  <p>How to do this ?</p>