title: How to set up morphTo() parameters
body: <p>Method signature of morphTo() is:</p>
  
  <pre><code>public function morphTo($name = null, $type = null, $id = null, $ownerKey = null)
  {
      ....
  </code></pre>
  
  <p>What does $name, $type, $id, $ownerKey mean in the laravel documentation example?</p>
  
  <blockquote>
    <p>posts
        id - integer
        name - string</p>
    
    <p>users
        id - integer
        name - string</p>
    
    <p>images
        id - integer
        url - string
        imageable_id - integer
        imageable_type - string</p>
  </blockquote>