我使用 SQLAlchemy 版本化对象示例作为参考。
示例:http ://docs.sqlalchemy.org/en/rel_0_7/orm/examples.html#versioned-objects
当我更新记录时,我没有收到任何错误。正在创建 case_history 表,但版本号保持在 '1' 并且 case_history 表为空。
(是的,我知道我使用“case”作为类名。这很糟糕吗?)
这是我的代码片段:
模型.py:
from history_meta import Versioned, versioned_session
# set up the base class
class Base(object):
@declared_attr
def __tablename__(cls):
return cls.__name__.lower()
id = Column(Integer, primary_key = True)
header_row = Column(SmallInteger)
def to_dict(self):
serialized = dict((column_name, getattr(self, column_name))
for column_name in self.__table__.c.keys())
return serialized
Base = declarative_base(cls=Base)
class case(Versioned, Base):
title = Column(String(32))
description = Column(Text)
def __repr__(self):
return self.title
应用程序.py:
engine = create_engine(SQLALCHEMY_DATABASE_URI)
Session = sessionmaker(bind=engine)
versioned_session(Session)
db = Session()
...
@app.route('/<name>/:record', method='POST')
def default(name, record):
myClass = getattr(sys.modules[__name__], name)
db.query(myClass).filter(myClass.id == record).update(request.json)
for u in db.query(case).filter(case.id == record):
print u.version # Version is always 1
db.commit() # I added this just to test versioning.
关于为什么没有发生版本控制的任何线索?