Django REST framework support only one lookup field at a time. To support more than one field we have to use MultipleFieldLookupMixin. But it has a limitation. It require all fields to be present in URL. I have different requirement. I can call view using two differnet identifier.

MultipleFieldLookupORMixin.py

class MultipleFieldLookupORMixin(object):
    """
    Actual code http://www.django-rest-framework.org/api-guide/generic-views/#creating-custom-mixins
    Apply this mixin to any view or viewset to get multiple field filtering
    based on a `lookup_fields` attribute, instead of the default single field filtering.
    """
    def get_object(self):
        queryset = self.get_queryset()             # Get the base queryset
        queryset = self.filter_queryset(queryset)  # Apply any filter backends
        filter = {}
        for field in self.lookup_fields:
            try:                                  # Get the result with one or more fields.
                filter[field] = self.kwargs[field]
            except Exception:
                pass
        return get_object_or_404(queryset, **filter)  # Lookup the object
        
  class RetrieveUserView(MultipleFieldLookupORMixin, generics.RetrieveAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer
    lookup_fields = ('account', 'username')
    

Very useful.