.filter(ChangesetStatus.user_id == user_id)\

            .order_by(ChangesetStatus.version)\

            .first()

        return str(status.status) if status else ''

    @classmethod

    def make_nice_id(cls, pull_request_id):

        '''Return pull request id nicely formatted for displaying'''

        return '#%s' % pull_request_id

    def nice_id(self):

        '''Return the id of this pull request, nicely formatted for displaying'''

        return self.make_nice_id(self.pull_request_id)

    def __json__(self):

        return dict(

            revisions=self.revisions

        )

    def url(self, **kwargs):

        canonical = kwargs.pop('canonical', None)

        import kallithea.lib.helpers as h

        b = self.org_ref_parts[1]

        if b != self.other_ref_parts[1]:

            s = '/_/' + b

        else:

            s = '/_/' + self.title

        kwargs['extra'] = urlreadable(s)

        if canonical:

            return h.canonical_url('pullrequest_show', repo_name=self.other_repo.repo_name,

                                   pull_request_id=self.pull_request_id, **kwargs)

        return h.url('pullrequest_show', repo_name=self.other_repo.repo_name,

                     pull_request_id=self.pull_request_id, **kwargs)

class PullRequestReviewers(Base, BaseModel):

    __tablename__ = 'pull_request_reviewers'

    __table_args__ = (

        {'extend_existing': True, 'mysql_engine': 'InnoDB',

         'mysql_charset': 'utf8', 'sqlite_autoincrement': True},

    )

    def __init__(self, user=None, pull_request=None):

        self.user = user

        self.pull_request = pull_request

    pull_requests_reviewers_id = Column(Integer(), nullable=False, unique=True, primary_key=True)

    pull_request_id = Column(Integer(), ForeignKey('pull_requests.pull_request_id'), nullable=False)

    user_id = Column(Integer(), ForeignKey('users.user_id'), nullable=True)

    user = relationship('User')

    pull_request = relationship('PullRequest')

class Notification(Base, BaseModel):

    __tablename__ = 'notifications'

    __table_args__ = (

        Index('notification_type_idx', 'type'),

        {'extend_existing': True, 'mysql_engine': 'InnoDB',

         'mysql_charset': 'utf8', 'sqlite_autoincrement': True},

    )

    TYPE_CHANGESET_COMMENT = u'cs_comment'

    TYPE_MESSAGE = u'message'

    TYPE_MENTION = u'mention'

    TYPE_REGISTRATION = u'registration'

    TYPE_PULL_REQUEST = u'pull_request'

    TYPE_PULL_REQUEST_COMMENT = u'pull_request_comment'

    notification_id = Column(Integer(), nullable=False, unique=True, primary_key=True)

    subject = Column(Unicode(512), nullable=True)

    body = Column(UnicodeText(50000), nullable=True)

    created_by = Column(Integer(), ForeignKey('users.user_id'), nullable=True)

    created_on = Column(DateTime(timezone=False), nullable=False, default=datetime.datetime.now)

    type_ = Column('type', Unicode(255))

    created_by_user = relationship('User')

    notifications_to_users = relationship('UserNotification', cascade="all, delete-orphan")

    @property

    def recipients(self):

        return [x.user for x in UserNotification.query()

                .filter(UserNotification.notification == self)

                .order_by(UserNotification.user_id.asc()).all()]

    @classmethod

    def create(cls, created_by, subject, body, recipients, type_=None):

        if type_ is None:

            type_ = Notification.TYPE_MESSAGE

        notification = cls()

        notification.created_by_user = created_by

        notification.subject = subject

        notification.body = body

        notification.type_ = type_

        notification.created_on = datetime.datetime.now()

        Session().add(notification)

        Session().flush() # assign notificaiton.notification_id

        return notification

    @property

    def description(self):

        from kallithea.model.notification import NotificationModel

        return NotificationModel().make_description(self)

class UserNotification(Base, BaseModel):

    __tablename__ = 'user_to_notification'

    __table_args__ = (

        UniqueConstraint('user_id', 'notification_id'),

        {'extend_existing': True, 'mysql_engine': 'InnoDB',

         'mysql_charset': 'utf8', 'sqlite_autoincrement': True}

    )

    user_id = Column(Integer(), ForeignKey('users.user_id'), primary_key=True)

    notification_id = Column(Integer(), ForeignKey('notifications.notification_id'), primary_key=True)

    read = Column(Boolean, default=False)

    sent_on = Column(DateTime(timezone=False), nullable=True, unique=None)

    user = relationship('User')

    notification = relationship('Notification')

    def mark_as_read(self):

        self.read = True

        Session().add(self)

class Gist(Base, BaseModel):

    __tablename__ = 'gists'

    __table_args__ = (

        Index('g_gist_access_id_idx', 'gist_access_id'),

        Index('g_created_on_idx', 'created_on'),

        {'extend_existing': True, 'mysql_engine': 'InnoDB',

         'mysql_charset': 'utf8', 'sqlite_autoincrement': True}

    )

    GIST_PUBLIC = u'public'

    GIST_PRIVATE = u'private'

    DEFAULT_FILENAME = u'gistfile1.txt'

    gist_id = Column(Integer(), nullable=False, unique=True, primary_key=True)

    gist_access_id = Column(Unicode(250))

    gist_description = Column(UnicodeText(1024))

    gist_owner = Column('user_id', Integer(), ForeignKey('users.user_id'), nullable=True)

    gist_expires = Column(Float(53), nullable=False)

    gist_type = Column(Unicode(128), nullable=False)

    created_on = Column(DateTime(timezone=False), nullable=False, default=datetime.datetime.now)

    modified_at = Column(DateTime(timezone=False), nullable=False, default=datetime.datetime.now)

    owner = relationship('User')

    def __repr__(self):

        return '<Gist:[%s]%s>' % (self.gist_type, self.gist_access_id)

    @classmethod

    def get_or_404(cls, id_):

        res = cls.query().filter(cls.gist_access_id == id_).scalar()

        if res is None:

            raise HTTPNotFound

        return res

    @classmethod

    def get_by_access_id(cls, gist_access_id):

        return cls.query().filter(cls.gist_access_id == gist_access_id).scalar()

    def gist_url(self):

        import kallithea

        alias_url = kallithea.CONFIG.get('gist_alias_url')

        if alias_url:

            return alias_url.replace('{gistid}', self.gist_access_id)

        import kallithea.lib.helpers as h

        return h.canonical_url('gist', gist_id=self.gist_access_id)

    @classmethod

    def base_path(cls):

        """

        Returns base path where all gists are stored

        :param cls:

        """

        from kallithea.model.gist import GIST_STORE_LOC

        q = Session().query(Ui)\

            .filter(Ui.ui_key == URL_SEP)

        q = q.options(FromCache("sql_cache_short", "repository_repo_path"))

        return os.path.join(q.one().ui_value, GIST_STORE_LOC)

    def get_api_data(self):

        """

        Common function for generating gist related data for API

        """

        gist = self

        data = dict(

            gist_id=gist.gist_id,

        notifications = Notification.query().all()

        self.assertEqual(len(notifications), 1)

        self.assertEqual(notifications[0].recipients, [u1, u2])

        self.assertEqual(notification.notification_id,

                         notifications[0].notification_id)

        unotification = UserNotification.query()\

            .filter(UserNotification.notification == notification).all()

        self.assertEqual(len(unotification), len(usrs))

        self.assertEqual(set([x.user.user_id for x in unotification]),

                         set(usrs))

    def test_user_notifications(self):

        notification1 = NotificationModel().create(created_by=self.u1,

                                            subject=u'subj', body=u'hi there1',

                                            recipients=[self.u3])

        Session().commit()

        notification2 = NotificationModel().create(created_by=self.u1,

                                            subject=u'subj', body=u'hi there2',

                                            recipients=[self.u3])

        Session().commit()

        u3 = Session().query(User).get(self.u3)

        self.assertEqual(sorted([x.notification for x in u3.notifications]),

                         sorted([notification2, notification1]))

    def test_delete_notifications(self):

        notification = NotificationModel().create(created_by=self.u1,

                                           subject=u'title', body=u'hi there3',

                                    recipients=[self.u3, self.u1, self.u2])

        Session().commit()

        notifications = Notification.query().all()

        self.assertTrue(notification in notifications)

        Notification.delete(notification.notification_id)

        Session().commit()

        notifications = Notification.query().all()

        self.assertFalse(notification in notifications)

        un = UserNotification.query().filter(UserNotification.notification

                                             == notification).all()

        self.assertEqual(un, [])

    def test_delete_association(self):

        notification = NotificationModel().create(created_by=self.u1,

                                           subject=u'title', body=u'hi there3',

                                    recipients=[self.u3, self.u1, self.u2])

        Session().commit()

        unotification = UserNotification.query()\

                            .filter(UserNotification.notification ==

                                    notification)\

                            .filter(UserNotification.user_id == self.u3)\

                            .scalar()

        self.assertEqual(unotification.user_id, self.u3)

        NotificationModel().delete(self.u3,

                                   notification.notification_id)

        Session().commit()

        u3notification = UserNotification.query()\

                            .filter(UserNotification.notification ==

                                    notification)\

                            .filter(UserNotification.user_id == self.u3)\

                            .scalar()

        self.assertEqual(u3notification, None)

        # notification object is still there

        self.assertEqual(Notification.query().all(), [notification])

        #u1 and u2 still have assignments

        u1notification = UserNotification.query()\

                            .filter(UserNotification.notification ==

                                    notification)\

                            .filter(UserNotification.user_id == self.u1)\

                            .scalar()

        self.assertNotEqual(u1notification, None)

        u2notification = UserNotification.query()\

                            .filter(UserNotification.notification ==

                                    notification)\

                            .filter(UserNotification.user_id == self.u2)\

                            .scalar()

        self.assertNotEqual(u2notification, None)

    def test_notification_counter(self):

        NotificationModel().create(created_by=self.u1,

                            subject=u'title', body=u'hi there_delete',

                            recipients=[self.u3, self.u1])

        Session().commit()

        self.assertEqual(NotificationModel()

        self.assertEqual(NotificationModel()

                         .get_unread_cnt_for_user(self.u2), 0)

        self.assertEqual(NotificationModel()

                         .get_unread_cnt_for_user(self.u3), 1)

        notification = NotificationModel().create(created_by=self.u1,

                                           subject=u'title', body=u'hi there3',

                                    recipients=[self.u3, self.u1, self.u2])

        Session().commit()

        self.assertEqual(NotificationModel()

        self.assertEqual(NotificationModel()

                         .get_unread_cnt_for_user(self.u2), 1)

        self.assertEqual(NotificationModel()

                         .get_unread_cnt_for_user(self.u3), 2)