title: Return image url in Django Rest Framework
body: <p>I am using Django Rest Framework and have the following model:</p>
  
  <pre><code>class Picture(models.Model):
      some_field = models.ForeignKey(some_model)
      image = models.ImageField()
  </code></pre>
  
  <p>I would like to write a GET endpoint that returns the url of the image. This is what I've done so far</p>
  
  <pre><code>def get(self, request, aid):
      '''
      Get Image
      '''
      try:
          picture = Picture.objects.filter(some_field=aid)
      except Picture.DoesNotExist:
          raise Http404
  
      serialiser = PictureSerialiser(picture)
      return Response(serialiser.data)
  </code></pre>
  
  <p>and my Serialiser as follows:</p>
  
  <pre><code>class PictureSerialiser(serializers.ModelSerializer):
  
      class Meta:
          model = Picture
          fields = ('field', 'image')
  </code></pre>
  
  <p>How do I make sure that the response is <code>{field:'Value here', image:'url to image'}</code>?</p>