docs: def setup_managers(self):
          """
          Allows to access manager by model name - it is convenient, because HasOffers returns model names in responses.
          """
          self._managers = {}
          for manager_class in MODEL_MANAGERS:
              instance = manager_class(self)
              if not instance.forbid_registration \
                      and not isinstance(instance, ApplicationManager) or instance.__class__ is ApplicationManager:
                  # Descendants of ``ApplicationManager`` shouldn't be present in API instance.  They are controlled by
                  # Application controller. The manager itself, on the other hand, should.
                  setattr(self, instance.name, instance)
              if instance.model:
                  self._managers[instance.model.__name__] = instance
              if instance.model_aliases:
                  for alias in instance.model_aliases:
                      self._managers[alias] = instance