title: Model and Permissions
body: <p>I'm currently learning python/django
  As a Tutorial for myself I have done that: </p>
  
  <ul>
  <li>create user --> ok</li>
  <li>login user created --> ok</li>
  <li>create a new model called 'Article' with title and content as a properties --> ok</li>
  <li>create several 'Article' instances --> ok</li>
  <li>I display all the articles at the root of the webapp --> </li>
  <li>Last step is: in order to manipulate permission, only display some article depending on which user is logged with permissions. like if user A: then display only the article with odd ids (that doesn't make any sence but it's for learning) </li>
  </ul>
  
  <p>It seems to be very complicated to do 'permission by instance' by hand right ?</p>
  
  <p>Cheers</p>