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# Copyright 2009 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
# pylint: disable-msg=E0611,W0212
"""SQLBase implementation of IQuestionSubscription."""
__metaclass__ = type
__all__ = ['QuestionSubscription']
from sqlobject import ForeignKey
from zope.interface import implements
from canonical.database.sqlbase import SQLBase
from lp.answers.interfaces.questionsubscription import IQuestionSubscription
from lp.registry.interfaces.person import validate_public_person
from lp.registry.interfaces.role import IPersonRoles
class QuestionSubscription(SQLBase):
"""A subscription for person to a question."""
implements(IQuestionSubscription)
_table = 'QuestionSubscription'
question = ForeignKey(
dbName='question', foreignKey='Question', notNull=True)
person = ForeignKey(
dbName='person', foreignKey='Person',
storm_validator=validate_public_person, notNull=True)
def canBeUnsubscribedByUser(self, user):
"""See `IQuestionSubscription`."""
if user is None:
return False
# The people who can unsubscribe someone are:
# - lp admins
# - the person themselves
# - the question owner
# - people who can reject questions (eg target owner, answer contacts)
return (user.inTeam(self.question.owner) or
user.inTeam(self.person) or
IPersonRoles(user).in_admin or
self.question.canReject(user))
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