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# Copyright (C) 2006-2014 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Base class for all database classes."""
from __future__ import absolute_import, print_function, unicode_literals
__metaclass__ = type
__all__ = [
'Model',
]
from operator import attrgetter
from sqlalchemy.ext.declarative import declarative_base
class ModelMeta(object):
"""Do more magic on table classes."""
_class_registry = set()
def __init__(self, name, bases, dict):
# Before we let the base class do it's thing, force an __tablename__
# property to enforce our table naming convention.
self.__tablename__ = name.lower()
# super(ModelMeta, self).__init__(name, bases, dict)
# Register the model class so that it can be more easily cleared.
# This is required by the test framework so that the corresponding
# table can be reset between tests.
#
# The PRESERVE flag indicates whether the table should be reset or
# not. We have to handle the actual Model base class explicitly
# because it does not correspond to a table in the database.
if not getattr(self, 'PRESERVE', False) and name != 'Model':
ModelMeta._class_registry.add(self)
@staticmethod
def _reset(store):
from mailman.config import config
config.db._pre_reset(store)
# Make sure this is deterministic, by sorting on the storm table name.
classes = sorted(ModelMeta._class_registry,
key=attrgetter('__tablename__'))
for model_class in classes:
store.query(model_class).delete()
Model = declarative_base(cls=ModelMeta)
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