code: def validate_state(self, model, context=None):
          
          result = Result()
          for state_validator in self.state:
              error = state_validator.run(
                  value=model,
                  model=model,
                  context=context
              )
              if error:
                  result.add_state_errors(error)
  
          return result
docs: Validate model state
          Run state validators and return and result object.
          :param model:  object or dict
          :param context: object, dict or None
          :return: shiftschema.result.Result