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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 User Model."""
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−
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−__authors__ = [
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−  '"Todd Larsen" <tlarsen@google.com>',
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−  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
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−  '"Pawel Solyga" <pawel.solyga@gmail.com>',
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−]
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−
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−from google.appengine.ext import db
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−from django.utils.translation import ugettext_lazy
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−
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−
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−class User(db.Model):
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−  """A user and associated login credentials, the fundamental identity entity.
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−
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−  User is a separate Model class from Person because the same login 
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−  ID may be used to, for example, serve as Contributor in one Program 
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−  and a Reviewer in another.
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−
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−  Also, this allows a Person to, in the future, re-associate that 
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−  Person entity with a different Google Account if necessary.
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−
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−  A User entity participates in the following relationships implemented 
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−  as a db.ReferenceProperty elsewhere in another db.Model:
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−
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−   persons)  a 1:many relationship of Person entities identified by the
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−     User.  This relation is implemented as the 'persons' back-reference
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−     Query of the Person model 'user' reference.
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−
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−  """
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−
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−  #: A Google Account, which also provides a "private" email address.
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−  #: This email address is only used in an automated fashion by 
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−  #: Melange web applications and is not made visible to other users 
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−  #: of any Melange application.
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−  id = db.UserProperty(required=True)
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−
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−  #: Required field storing a nickname; displayed publicly.
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−  #: Nicknames can be any valid UTF-8 text.
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−  nick_name = db.StringProperty(required=True,
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−      verbose_name=ugettext_lazy('Nick name'))
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−      
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−  #: Required field storing linkname used in URLs to identify user.
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−  #: Lower ASCII characters only.
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−  link_name = db.StringProperty(required=True,
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−      verbose_name=ugettext_lazy('Link name'))
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−  link_name.help_text = ugettext_lazy(
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−      'Field used in URLs to identify user. '
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−      'Lower ASCII characters only.')
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−
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−  @staticmethod
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−  def doesUserExist(id=None):
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−    """Returns if user already exists in the Datastore.
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−    
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−    Args:
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−      user: a Google Account object,
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−    """
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−    #: let's do a gql query and check if user exists in datastore
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−    data = self.getUserForId(id)
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−    if data:
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−      return True
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−    else:
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−      return False
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−
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−  @staticmethod
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−  def getUserForId(id=None):
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−    """Returns User entity from datastore, or None if not found.  
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−    
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−    Args:
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−      user: a Google Account object,
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−    """
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−    return User.gql('WHERE id = :1', id).get()
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−
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−  @staticmethod
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−  def getUserForLinkname(link_name=None):
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−    """Returns User entity for linkname or None if not found.
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−    
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−    Args:
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−      link_name: linkname used in URLs to identify user,
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−    """
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−    return User.gql('WHERE link_name = :1', link_name).get()
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−