RhodeCode / rhodecode / model /

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# -*- coding: utf-8 -*-

    The application's model objects

    :created_on: Nov 25, 2010
    :author: marcink
    :copyright: (C) 2010-2012 Marcin Kuzminski <>
    :license: GPLv3, see COPYING for more details.


        .. code-block:: python

           from paste.deploy import appconfig
           from pylons import config
           from sqlalchemy import engine_from_config
           from rhodecode.config.environment import load_environment

           conf = appconfig('config:development.ini', relative_to = './../../')
           load_environment(conf.global_conf, conf.local_conf)

           engine = engine_from_config(config, 'sqlalchemy.')
           # RUN YOUR CODE HERE

# This program 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.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <>.

import logging

from rhodecode.model import meta

log = logging.getLogger(__name__)

def init_model(engine):
    Initializes db session, bind the engine with the metadata,
    Call this before using any of the tables or classes in the model,
    preferably once in application start

    :param engine: engine to bind to
    """"initializing db for %s" % engine)
    meta.Base.metadata.bind = engine

class BaseModel(object):
    Base Model for all RhodeCode models, it adds sql alchemy session
    into instance of model

    :param sa: If passed it reuses this session instead of creating a new one

    def __init__(self, sa=None):
        if sa is not None:
   = sa
   = meta.Session

    def _get_instance(self, cls, instance, callback=None):
        Get's instance of given cls using some simple lookup mechanism.

        :param cls: class to fetch
        :param instance: int or Instance
        :param callback: callback to call if all lookups failed

        if isinstance(instance, cls):
            return instance
        elif isinstance(instance, (int, long)) or str(instance).isdigit():
            return cls.get(instance)
            if instance:
                if callback is None:
                    raise Exception(
                        'given object must be int, long or Instance of %s '
                        'got %s, no callback provided' % (cls, type(instance))
                    return callback(instance)