  
  class UpdateModelMixin(object):
      """
      Update a model instance.
      Should be mixed in with `SingleObjectBaseView`.
      """
      def update(self, request, *args, **kwargs):
          partial = kwargs.pop('partial', False)
          self.object = None
          try:
 
</s> remove     Should be mixed in with any `BaseView`.
 </s> add     Should be mixed in with any `GenericAPIView`. </s> remove     Should be mixed in with `SingleObjectBaseView`.
 </s> add     Should be mixed in with `SingleObjectAPIView`. </s> remove     Should be mixed in with `SingleObjectBaseView`.
 </s> add     Should be mixed in with `SingleObjectAPIView`.
    Should be mixed in with `SingleObjectAPIView`.
  
  class UpdateModelMixin(object):
      """
      Update a model instance.
    Should be mixed in with `SingleObjectAPIView`.
      """
      def update(self, request, *args, **kwargs):
          partial = kwargs.pop('partial', False)
          self.object = None
          try:
keep keep keep keep replace keep keep keep keep keep
 Fix out of date docstrings. Closes #689. 
rest_framework/mixins.py