118 lines
3.9 KiB
Python
118 lines
3.9 KiB
Python
# Copyright (c) 2011 X.commerce, a business unit of eBay Inc.
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# Copyright 2011 Piston Cloud Computing, Inc.
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# Copyright 2012 Cloudscaling Group, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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SQLAlchemy models.
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"""
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import six
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from sqlalchemy import Column, Integer
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from sqlalchemy import DateTime
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from sqlalchemy.orm import object_mapper
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from keystone.openstack.common.db.sqlalchemy import session as sa
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from keystone.openstack.common import timeutils
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class ModelBase(object):
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"""Base class for models."""
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__table_initialized__ = False
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def save(self, session=None):
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"""Save this object."""
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if not session:
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session = sa.get_session()
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# NOTE(boris-42): This part of code should be look like:
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# session.add(self)
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# session.flush()
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# But there is a bug in sqlalchemy and eventlet that
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# raises NoneType exception if there is no running
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# transaction and rollback is called. As long as
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# sqlalchemy has this bug we have to create transaction
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# explicitly.
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with session.begin(subtransactions=True):
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session.add(self)
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session.flush()
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def __setitem__(self, key, value):
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setattr(self, key, value)
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def __getitem__(self, key):
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return getattr(self, key)
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def get(self, key, default=None):
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return getattr(self, key, default)
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@property
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def _extra_keys(self):
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"""Specifies custom fields
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Subclasses can override this property to return a list
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of custom fields that should be included in their dict
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representation.
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For reference check tests/db/sqlalchemy/test_models.py
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"""
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return []
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def __iter__(self):
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columns = dict(object_mapper(self).columns).keys()
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# NOTE(russellb): Allow models to specify other keys that can be looked
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# up, beyond the actual db columns. An example would be the 'name'
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# property for an Instance.
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columns.extend(self._extra_keys)
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self._i = iter(columns)
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return self
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def next(self):
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n = six.advance_iterator(self._i)
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return n, getattr(self, n)
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def update(self, values):
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"""Make the model object behave like a dict."""
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for k, v in six.iteritems(values):
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setattr(self, k, v)
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def iteritems(self):
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"""Make the model object behave like a dict.
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Includes attributes from joins.
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"""
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local = dict(self)
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joined = dict([(k, v) for k, v in six.iteritems(self.__dict__)
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if not k[0] == '_'])
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local.update(joined)
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return six.iteritems(local)
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class TimestampMixin(object):
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created_at = Column(DateTime, default=timeutils.utcnow)
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updated_at = Column(DateTime, onupdate=timeutils.utcnow)
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class SoftDeleteMixin(object):
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deleted_at = Column(DateTime)
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deleted = Column(Integer, default=0)
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def soft_delete(self, session=None):
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"""Mark this object as deleted."""
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self.deleted = self.id
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self.deleted_at = timeutils.utcnow()
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self.save(session=session)
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