Move find_by_permalink to class method
Move autoset permalink to Permalinkable
Add scoping to permalinks
Show user posts

Template for forum/topic

    <h1>{{topic.name}}</h1>
    <table>
    {% for message in topic.messages %}
    <tr>
      <td>{{message.user.name}}</td>
      <td>{{message.body}}</td>
    </tr>
    {% endfor %}