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−#!/usr/bin/python2.5
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−#
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−# Copyright 2008 the Melange authors.
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−#
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−# Licensed under the Apache License, Version 2.0 (the "License");
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−# you may not use this file except in compliance with the License.
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−# You may obtain a copy of the License at
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−#
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−#   http://www.apache.org/licenses/LICENSE-2.0
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−#
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−# Unless required by applicable law or agreed to in writing, software
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−# distributed under the License is distributed on an "AS IS" BASIS,
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−# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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−# See the License for the specific language governing permissions and
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−# limitations under the License.
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−
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−"""This module contains the Response Model."""
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−
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−__authors__ = [
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−  '"Todd Larsen" <tlarsen@google.com>',
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−]
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−
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−
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−import polymodel
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−
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−from google.appengine.ext import db
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−
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−import soc.models.quiz
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−import soc.models.user
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−
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−
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−class Response(polymodel.PolyModel):
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−  """Model of a Response to a Quiz.
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−
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−  A Response is the "collection point" for a set of specific Answers to the
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−  Questions that make up a Quiz.
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−
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−  In addition to the explicit ReferenceProperties in the Response Model, a
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−  Response entity participates in these relationships:
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−
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−    answers)  a 1:many relationship between Answer entities and this
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−      Response.  Each Answer points to the Response to which it is a part.
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−      The collection of Answers that make up a Response is implemented as
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−      the 'answers' back-reference Query of the Answer model 'response'
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−      reference.
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−
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−    proposal)  an optional 1:1 relationship where a Proposal placed its
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−      Answers to a Quiz associated with the Proposal.  This relation is
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−      implemented as the 'proposal' back-reference Query of the Proposal
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−      Model 'response' reference.
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−  """
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−
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−  #: a required many:1 relationship between Responses and a Quiz that
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−  #: defines what Questions for which each Response collects Answers
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−  #: (that is, there can be many Responses to the same Quiz)
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−  quiz = db.ReferenceProperty(reference_class=soc.models.quiz.Quiz,
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−                              required=True, collection_name="responses")
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−
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−  #: a required many:1 relationship with a User that indicates which User
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−  #: submitted the Response (answered the Questions in the Quiz)
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−  respondent = db.ReferenceProperty(
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−      reference_class=soc.models.user.User, required=True,
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−      collection_name="responses")
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−
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−  # TODO(tlarsen): should 'respondent' be a ReferenceProperty to some Role
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−  #   instead?