title: Struggling to get django_comments to work with Django REST Framework
body: <p>I'm using Django REST Framework for the first time on a project and I'm struggling with one particular part. The project is an issue tracker-type applicaton and it uses <code>django_comments</code> to allow for comments on issues. I'm now building an API on top of it to allow for creating a mobile app.</p>
  
  <p>I've created the following serializers:</p>
  
  <pre><code>from django.contrib.auth.models import User
  from todolist.models import Project, Issue
  from rest_framework import serializers
  from django_comments.models import Comment
  
  class UserSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = User
          fields = ('id', 'email', 'first_name', 'last_name')
  
  
  class ProjectSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Project
          fields = ('name', 'description', 'owner')
  
  
  class CommentSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Comment
  
  
  class IssueSerializer(serializers.HyperlinkedModelSerializer):
      comments = CommentSerializer(many=True)
  
      class Meta:
          model = Issue
  </code></pre>
  
  <p>And here's my project-wide <code>urls.py</code>, where I define the routes:</p>
  
  <pre><code>from django.conf.urls import patterns, include, url 
  from todolist.views import HomeTemplateView, UserViewSet, ProjectViewSet, IssueViewSet, CommentViewSet
  from rest_framework import routers
  from rest_framework.authtoken.views import obtain_auth_token
  
  # Uncomment the next two lines to enable the admin:
  from django.contrib import admin
  admin.autodiscover()
  
  router = routers.DefaultRouter()
  router.register(r'users', UserViewSet)
  router.register(r'projects', ProjectViewSet)
  router.register(r'issues', IssueViewSet)
  router.register(r'comments', CommentViewSet)
  
  urlpatterns = patterns('',
      # Examples:
      # url(r'^$', 'projectile.views.home', name='home'),
      # url(r'^projectile/', include('projectile.foo.urls')),
  
      # Uncomment the admin/doc line below to enable admin documentation:
      # url(r'^admin/doc/', include('django.contrib.admindocs.urls')),
  
      # Uncomment the next line to enable the admin:
      url(r'^admin/', include(admin.site.urls)),
  
      # Comments
      (r'^comments/', include('django_comments.urls')),
  
      # Login
      url(r'^accounts/login/$', 'django.contrib.auth.views.login'),
  
      # Logout
      url(r'^accounts/logout/$', 'django.contrib.auth.views.logout_then_login', {'login_url': '/accounts/login/'}),
  
      # To-do list
      url(r'^projects/', include('todolist.urls')),
  
      # Home page
      url(r'^$', HomeTemplateView.as_view(
          template_name="todolist/home.html",
          )), 
  
      # Router URLs
      url(r'^api/', include(router.urls)),
  
      # REST framework auth URLs
      url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
      url(r'^api-token-auth/', obtain_auth_token),
  
      # API docs
      url(r'^docs/', include('rest_framework_swagger.urls'))
  )
  </code></pre>
  
  <p>I'm seeing the following error when I run a test which tries to get all the comments:</p>
  
  <pre><code>ImproperlyConfigured: Could not resolve URL for hyperlinked relationship using view name "contenttype-detail". You may have failed to include the related model in your API, or incorrectly configured the `lookup_field` attribute on this field.
  </code></pre>
  
  <p>Also, when I fetch an issue, it doesn't include the comments.</p>
  
  <p>Now, this error appears to me to be that when fetching a comment, it's unable to match up the comment to its parent. I've <a href="https://stackoverflow.com/questions/24453709/accessing-comments-on-an-object-via-reverse-relationship-with-tastypie">experienced similar problems when using Tastypie in the past</a>, and I'm unsure how to resolve it with DRF.</p>