def get_value_for_datastore(self, model_instance):
    value = self.validate_list_contents(
        super(ListProperty, self).get_value_for_datastore(model_instance))
    if self.validator:
      self.validator(value)
    return value
Get value from property to send to datastore.
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/ext/db/__init__.py/ListProperty.get_value_for_datastore