title: laravel belongsTo gives null
body: <p>belongsTo relation in laravel is returning null</p>
  
  <pre><code>public function games(){
      return $this-&gt;belongsTo('App\Models\Game');
    }
  </code></pre>
  
  <p>but when i provide key as argument it seems to work fine</p>
  
  <pre><code>  public function games(){
          return $this-&gt;belongsTo('App\Models\Game','game_id');
        }
  </code></pre>
  
  <p>but as per the <a href="https://laravel.com/docs/5.1/eloquent-relationships#one-to-many" rel="nofollow">docs</a> <code>game_id</code> is itself is a default argument. What is the small thing i am missing here.</p>
  
  <p>Thanks</p>