title: tastypie return empty resource_uri in get
body: <p>This is the resource</p>
  
  <pre><code>class TagResource(ModelResource):
      user = tastypie.fields.ForeignKey(UserResource,'user')
  
      class Meta:
          queryset = Tag.objects.all()
          resource_name = 'tag'
          authorization= Authorization()
          object_class = Tag
          filtering = { 
              'name' : ALL, 
          }
  </code></pre>
  
  <p>simple get request </p>
  
  <pre><code>http://localhost:8000/api/v1/tag/1/?format=json
  </code></pre>
  
  <p>returns with empty <code>resource_uri</code></p>
  
  <pre><code>{"created": "2014-03-26T15:14:11.928068", 
   "id": 1, "name": "test", 
   "resource_uri": "", "user": ""}
  </code></pre>
  
  <p>Why is that ? </p>
  
  <p>I tried </p>
  
  <pre><code>def hydrate_resource_uri(self, bundle): 
    return bundle.get_resource_uri()
  </code></pre>
  
  <p>It didn't work and i'm pretty sure it's not supposed to require special care. </p>
  
  <p>What am i missing ? </p>