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# -*- coding: utf-8 -*-
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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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"""
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SQLAlchemy Metadata and Session object
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"""
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from beaker import cache
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import scoped_session, sessionmaker
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from kallithea.lib import caching_query
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# Beaker CacheManager. A home base for cache configurations.
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cache_manager = cache.CacheManager()
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__all__ = ['Base', 'Session']
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#
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# SQLAlchemy session manager.
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#
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session_factory = sessionmaker(
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query_cls=caching_query.query_callable(cache_manager),
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expire_on_commit=True)
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Session = scoped_session(session_factory)
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# The base class for declarative schemas in db.py
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# Engine is injected when model.__init__.init_model() sets meta.Base.metadata.bind
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Base = declarative_base()
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# to use cache use this in query:
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# .options(FromCache("sqlalchemy_cache_type", "cachekey"))
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# Define naming conventions for foreign keys, primary keys, indexes,
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# check constraints, and unique constraints, respectively.
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Base.metadata.naming_convention = {
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'fk': 'fk_%(table_name)s_%(column_0_name)s',
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'pk': 'pk_%(table_name)s',
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'ix': 'ix_%(column_0_label)s',
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'ck': 'ck_%(table_name)s_%(column_0_name)s',
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'uq': 'uq_%(table_name)s_%(column_0_name)s',
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}
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# For custom CheckConstraints (not those autogenerated e.g. for Boolean
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# types), a name should be given explicitly, since "column_0" is here a
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# rather vague notion. A custom name is also necesarry if the generated
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# name is very long, since MySQL limits identifiers to 64 characters.
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