#!/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 Task Model."""

__authors__ = [

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

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

]

from google.appengine.ext import db

import soc.models.linkable

import soc.models.proposal

class Task(soc.models.linkable.Linkable):

  """Model of a Task, which is a Proposal to be completed by Contributors.

  A Task brings along a Proposal that was used to initiate the Task.  A Task

  may have a unique collection of Reviews, in addition to those attached to

  the original Proposal.

  A Task entity participates in the following relationships implemented

  as a db.ReferenceProperty elsewhere in another db.Model:

   contributors)  a required many:many relationship associating all of

     the Contributors to a Task to the specific Task.  See the

     TasksContributors model for details.

  """

  #: A required many:1 relationship with the Proposal on which the

  #: Task is based.  A Task may be based on only a single Proposal,

  #: but a Proposal can be the foundation for multiple Tasks. The

  #: back-reference in the Proposal model is a Query named 'tasks'.

  proposal = db.ReferenceProperty(reference_class=soc.models.proposal.Proposal,

                                  required=True,

                                  collection_name="tasks")