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# -*- coding: utf-8 -*-
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"""
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rhodecode.model.__init__
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~~~~~~~~~~~~~~~~~~~~~~~~
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The application's model objects
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:created_on: Nov 25, 2010
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:author: marcink
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:copyright: (C) 2010-2012 Marcin Kuzminski <marcin@python-works.com>
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:license: GPLv3, see COPYING for more details.
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:example:
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.. code-block:: python
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from paste.deploy import appconfig
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from pylons import config
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from sqlalchemy import engine_from_config
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from rhodecode.config.environment import load_environment
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conf = appconfig('config:development.ini', relative_to = './../../')
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load_environment(conf.global_conf, conf.local_conf)
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engine = engine_from_config(config, 'sqlalchemy.')
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init_model(engine)
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# RUN YOUR CODE HERE
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"""
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import logging
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from rhodecode.model import meta
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log = logging.getLogger(__name__)
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def init_model(engine):
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"""
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Initializes db session, bind the engine with the metadata,
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Call this before using any of the tables or classes in the model,
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preferably once in application start
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:param engine: engine to bind to
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"""
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log.info("initializing db for %s" % engine)
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meta.Base.metadata.bind = engine
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class BaseModel(object):
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"""
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Base Model for all RhodeCode models, it adds sql alchemy session
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into instance of model
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:param sa: If passed it reuses this session instead of creating a new one
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"""
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def __init__(self, sa=None):
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if sa is not None:
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self.sa = sa
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else:
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self.sa = meta.Session
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def _get_instance(self, cls, instance, callback=None):
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"""
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Get's instance of given cls using some simple lookup mechanism.
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:param cls: class to fetch
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:param instance: int or Instance
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:param callback: callback to call if all lookups failed
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"""
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if isinstance(instance, cls):
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return instance
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elif isinstance(instance, (int, long)) or str(instance).isdigit():
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return cls.get(instance)
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else:
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if instance:
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if callback is None:
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raise Exception(
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'given object must be int, long or Instance of %s '
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'got %s, no callback provided' % (cls, type(instance))
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)
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else:
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return callback(instance)
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