title: Django admin link to image via ImageField
body: <p>I've set up a Django model of an activity which contains following field:</p>
  
  <pre><code>class Activity(models.Model):
      ...
      thumbnail = models.ImageField(upload_to="thumbs/", blank=True, null=True)
  </code></pre>
  
  <p>Via the admin interface I can upload an image that is put correctly in the thumbs folder of the home directory. When I try to edit the activity I created, the interface says: <code>Currently: thumbs/image.png</code> which is a hyperlink that points to <code>http://localhost:8000/media/thumbs/image.png</code>. When I click this link, I get a 404 page not found error. How can I get the link to point correctly to the image I uploaded? And if possible, how can I display the image directly in the admin interface?</p>
  
  <p>EDIT:</p>
  
  <p>MEDIA_ROOT = <code>'/Users/.../mysite/media/'</code>;
  MEDIA_URL = <code>'http://localhost:8000/media/'</code>;</p>
  
  <p>Contents of urls.py:</p>
  
  <pre><code>from django.conf.urls import patterns, include, url
  from django.contrib import admin
  admin.autodiscover()
  
  urlpatterns = patterns('',
      url(r'^admin/', include(admin.site.urls)),
  )
  </code></pre>
  
  <p>Thank you!</p>