title: Carrierwave remove picture and set back to default
body: <p>I'm using Rails 3 with carrierwave gem.</p>
  
  <p>I managed to removed the avatar image from my user model like this:</p>
  
  <pre><code>@user.remove_photo!
  </code></pre>
  
  <p>and it works perfectly. However, I want to set the picture url for that user back to the default_url (which is the image that every user has until they upload one).</p>
  
  <p>Any ideas how?</p>
  
  <p>--</p>
  
  <p>Image display code:</p>
  
  <pre><code>&lt;%= image_tag(@user.photo.send(:layout).url, :alt =&gt; @user.full_name, :class =&gt; 'photo large') %&gt;
  </code></pre>
  
  <p>default_url code:</p>
  
  <pre><code>def default_url
      "default_photo.jpg"
    end
  </code></pre>