title: how to implement sub model in Laravel
body: <p>my base class is post
  and many submodel such as : video post , image post 
  all class have specific attribute &amp; inherit parent attrib
  &amp; all class need specific behaviors</p>
  
  <p><strong>Problem</strong></p>
  
  <p>when find on post model elequent give super model(post) instance, its wrong 
  i need instance of submodel</p>