code: def post(self, request, *args, **kwargs):
          
  
          versions = self._get_versions()
          url = self.get_done_url()
          msg = None
  
          try:
              vid = int(request.POST.get('version', ''))
              version = versions.get(vid=vid)
              if request.POST.get('revert'):
                  object_url = self.get_object_url()
                  msg = self.revert(version, object_url)
              elif request.POST.get('delete'):
                  msg = self.delete(version)
                  # Delete should redirect back to itself
                  url = self.request.build_absolute_uri()
  
          # If the give version isn't valid we'll just silently redirect
          except (ValueError, versions.model.DoesNotExist):
              pass
  
          return self.render(request, redirect_url=url,
                     message=msg,
                     obj=self.object,
                     collect_render_data=False)
docs: Method for handling POST requests.
          Expects the 'vid' of the version to act on
          to be passed as in the POST variable 'version'.
  
          If a POST variable 'revert' is present this will
          call the revert method and then return a 'render
          redirect' to the result of the `get_done_url` method.
  
          If a POST variable 'delete' is present this will
          call the delete method and return a 'render redirect'
          to the result of the `get_done_url` method.
  
          If this method receives unexpected input, it will
          silently redirect to the result of the `get_done_url`
          method.