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Marcin Kuzminski

#176 LookupError: 00changelog.i@66f0739d7517: no node
- fixed mercurial concurency bug. While there were many concurrent request to different repos at one time, sometimes there were race conditions that caused mercurial backend to mix up repository instance with current repo path from environ, a major rewrite of the middleware fixed that.

"""SQLAlchemy Metadata and Session object"""
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import scoped_session, sessionmaker
from beaker import cache

from rhodecode.model import caching_query


# Beaker CacheManager.  A home base for cache configurations.
cache_manager = cache.CacheManager()

__all__ = ['Base', 'Session']
#
# SQLAlchemy session manager. Updated by model.init_model()
#
Session = scoped_session(
                sessionmaker(
                    query_cls=caching_query.query_callable(cache_manager)
                )
          )

# The declarative Base
Base = declarative_base()

#to use cache use this in query
#.options(FromCache("sqlalchemy_cache_type", "cachekey"))