code: def is_compatible(cls, value):
          
          if not hasattr(cls, 'value_type'):
              raise NotImplementedError(
                  'You must define a `value_type` attribute or override the '
                  '`is_compatible()` method on `SettingValueModel` subclasses.')
          return isinstance(value, cls.value_type)
docs: Returns ``True`` if this model should be used to store ``value``.
  
          Checks if ``value`` is an instance of ``value_type``. Override this
          method if you need more advanced behaviour. For example, to distinguish
          between single and multi-line text.