title: HyperlinkedIdentityField + @detail_route
body: <p>In Django Rest Framework, how can I point my <code>HyperlinkedIdentityfield</code> at a <code>@detail_route</code> defined in a <code>ViewSet</code>?</p>
  
  <p>For example, maybe I have <code>api/groups/members/</code> and members is defined as a <code>@detail_route</code> on the <code>GroupsViewSet</code> which returns currently active members. How would I expose <code>members: "api/groups/members/"</code> in my response using <code>HyperlinkedIdentityField</code>?</p>