对不起我以前不清楚,
编辑: 我正在使用sqlalchemy(backend:postgresql)的默认金字塔应用程序,使用
生成pcreate -s alchemy
所以我有与DBSession,pyramid_tm等相关的所有设置。我有这个代码
class User(Base):
id = Column(Integer, primary_key=True)
connection = relationship("UserConnection", uselist=False, backref="user")
class UserConnection(Base):
userid = Column(Integer, ForeignKey('user.id'), primary_key=True)
friends = Column(JSON)
def add_connection(user, friend):
with transaction.manager:
if not user.connection:
user_conn = UserConnection(userid=user.id, friends=[])
else:
user_conn = user.connection
user_conn.friends.append(friend)
print(user_connection.friends)
session.add(user_conn)
当我第一次运行add_connection()时,user.connection不在那里。新记录被创建但在下次运行时(如果这转到其他地方)记录没有得到更新,在控制台上我只能看到ROLLBACK / COMMIT但没有其他语句。
那里的print语句显示更新的结果,但db没有更新。
答案 0 :(得分:3)
您应该在请求范围内使用事务。
zope.sqlalchemy和pyramid_tm可以为您做到这一点。 您可以使用我的代码:
# -*- coding: utf-8 -*-
""" Pyramid sqlalchemy lib.
Session will be available as dbsession attribute on request.
! Do not close session on your own.
"""
import sqlalchemy
from sqlalchemy.orm import sessionmaker, scoped_session
from zope.sqlalchemy import ZopeTransactionExtension
Session = scoped_session(sessionmaker(
extension=ZopeTransactionExtension()
))
def includeme(config):
""" Setup sqlalchemy session connection for pyramid app.
:param config: Pyramid configuration
"""
config.include('pyramid_tm')
# creates database engine from ini settings passed to pyramid wsgi
engine = sqlalchemy.engine_from_config(
config.get_settings(), connect_args={
'charset': 'utf8'
}
)
# scoped session gives us thread safe session
Session.configure(bind=engine)
# make database session available in every request
config.add_request_method(
callable=lambda request: Session, name='dbsession', property=True
)
使用pip安装zope.sqlalchemy和pyramid_tm并调用config.include(pyramid_sqlalchemy)