113 lines
3.7 KiB
Python
113 lines
3.7 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# 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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# Copyright (c) 2013-2014 Wind River Systems, Inc.
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#
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"""
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SQLAlchemy models.
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"""
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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 sm_api.openstack.common.db.sqlalchemy.session import get_session
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from sm_api.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 = get_session()
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# NOTE(boris-42): This part of code should be look like:
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# sesssion.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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# explicity.
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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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def __iter__(self):
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columns = list(dict(object_mapper(self).columns))
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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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if hasattr(self, '_extra_keys'):
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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 = next(self._i)
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return n, getattr(self, n)
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# In Python 3, __next__() has replaced next().
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__next__ = next
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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 values.items():
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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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local = dict(self)
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joined = dict([(k, v) for k, v in self.__dict__.items()
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if not k[0] == '_'])
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local.update(joined)
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return iter(local.items())
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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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