from contextlib import contextmanager
from flask.ext.sqlalchemy import SQLAlchemy
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import scoped_session, sessionmaker

db = SQLAlchemy()

@contextmanager
def session_scope(engine):
    if engine:
        session = scoped_session(sessionmaker(autocommit = False, autoflush = False, bind = engine))
        #Base.query = session.query_property()

        try:
            yield session
            session.commit()
        except:
            session.rollback()
            raise
        finally:
            session.close()

import pkgutil

__all__ = []

for loader, module_name, is_pkg in pkgutil.walk_packages(__path__):
    __all__.append(module_name)

from . import *