User Variables

class VariableGroup(EndpointsModel):
  _message_fields_schema = ('name', 'id', 'tags', 'identifier')
  acl = ndb.StructuredProperty(AclRule)
  tag_keys = ndb.KeyProperty(kind='Tag', repeated=True)
  group_id = ndb.StringProperty()
  name = ndb.StringProperty()

  @property
  def identifier(self):
    if self.group_id is None:
      self.group_id = int(random.random() * 10000)
    return "vgroup_{}".format(self.group_id)

  @EndpointsAliasProperty(repeated=True, property_type=Tag.ProtoModel())
  def tags(self):
    if self.tag_keys:
      return ndb.get_multi(self.tag_keys)


class Variable(EndpointsModel):
  _message_fields_schema = ('value', 'id', 'groupid')
  acl = ndb.StructuredProperty(AclRule)
  group_key = ndb.KeyProperty(kind='VariableGroup')
  value = ndb.GenericProperty()

  @EndpointsAliasProperty(repeated=True, property_type=Tag.ProtoModel())
  def groupid(self):
    return self.group_key.id()