code: def update_or_create(self, model, **kwargs):
          '''Update or create a new instance of ``model``.
  
          This method can raise an exception if the ``kwargs`` dictionary
          contains field data that does not validate.
  
          :param model: a :class:`StdModel`
          :param kwargs: dictionary of parameters.
          :returns: A two elements tuple containing the instance and a boolean
              indicating if the instance was created or not.
          '''
          backend = self.model(model).backend
          return backend.execute(self._update_or_create(model, **kwargs)f update_or_create(self, model, **kwargs):
          '''Update or create a new instance of ``model``.
  
          This method can raise an exception if the ``kwargs`` dictionary
          contains field data that does not validate.
  
          :param model: a :class:`StdModel`
          :param kwargs: dictionary of parameters.
          :returns: A two elements tuple containing the instance and a boolean
              indicating if the instance was created or not.
          '''
          backend = self.model(model).backend
          return backend.execute(self._update_or_create(model, **kwargs))
docs: Update or create a new instance of ``model``.
  
          This method can raise an exception if the ``kwargs`` dictionary
          contains field data that does not validate.
  
          :param model: a :class:`StdModel`
          :param kwargs: dictionary of parameters.
          :returns: A two elements tuple containing the instance and a boolean
              indicating if the instance was created or not.