#!/usr/bin/python2.5

#

# Copyright 2008 the Melange authors.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

# 

#   http://www.apache.org/licenses/LICENSE-2.0

# 

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""This module contains the Answer Model."""

__authors__ = [

  '"Todd Larsen" <tlarsen@google.com>',

  '"Sverre Rabbelier" <sverre@rabbelier.nl>',

]

from google.appengine.ext import db

from soc import models

import soc.models.question

import soc.models.review

class Answer(db.Model):

  """Model of a specific Answer to a Question in a specific Review."""

  #: A required many:1 relationship, where each of many Answers is

  #: a specific answer to a single Question.  An Answer must always

  #: be associated with a Question in order to be interpreted.

  #: It is currently unclear how useful this back-reference will be,

  #: since the same question could be used in multiple different

  #: Review "templates". Given this, 'answers' currently only exists

  #: for completeness. 

  question = db.ReferenceProperty(reference_class=models.question.Question,

                                  required=True, collection_name="answers")

  #: A required many:1 relationship, where each of many Answers to

  #: different Questions represents the answer set of a specific

  #: Review. The back-reference in the Review model is a Query named

  #: 'answers' which represents all of the specific answers to

  #: questions in that Review.

  review = db.ReferenceProperty(reference_class=models.review.Review,

                                required=True, collection_name="answers")

  #: db.StringProperty storing the "short" answer to the question;

  #: the interpretation of this value depends on the Question entity

  #: referred to by 'question'. Answers can be indexed, filtered, and

  #: sorted by their "short" answer. Depending on the Question type,

  #: some Answers will use only 'short', some only 'long', some both.

  short = db.StringProperty()

  #: db.TextProperty storing the "long" answer to the question;

  #: the interpretation of this value depends on the Question entity

  #: referred to by 'question'.

  long = db.TextProperty()

  #: db.ListProperty of short strings from the list of possible

  #: picks in the question.pick_choices list.

  picks = db.ListProperty(item_type=str)