code: def hexists(self, key):
          
          try:
              hashkey = self.key
          except DoesNotExist:
              """
              If the object doesn't exists anymore, its PK is deleted, so the
              "self.key" call will raise a DoesNotExist exception. We catch it
              to return False, as the field doesn't exists too.
              """
              return False
          else:
              return self.connection.hexists(hashkey, key)
docs: Call the hexists command to check if the redis hash key exists for the
          current field