On Aug 21, 2013, at 12:40 PM, Hans-Peter Jansen <h...@urpla.net> wrote:
> Hi, > > being new to SQLAlchemy, I try to get my way through it. > > In an application, I have rather elaborate needs to track changes. > > I've defined 3 classes with declarative, where the main class has > relationships with two auxiliary classes, that refer to the main class with > foreign references. All pretty basic stuff. > > Now I need to track all modifications to all fields, including the > relationship list objects. > > What is the best way to accomplish this task with SQLAlchemy? > > Is there some boilerplate available to support this, or do I have to carry > around two objects and compare them item by item? you can intercept changes on attributes using the attribute event system: http://docs.sqlalchemy.org/en/rel_0_8/orm/events.html#attribute-events otherwise you can get at the changes on an attribute after the fact (but before a flush) using the history interface: http://docs.sqlalchemy.org/en/rel_0_8/orm/session.html?highlight=history#sqlalchemy.orm.attributes.History you can get a list of all attributes mapped using mapper.attrs: http://docs.sqlalchemy.org/en/rel_0_8/orm/mapper_config.html?highlight=mapper.attrs#sqlalchemy.orm.mapper.Mapper.attrs
signature.asc
Description: Message signed with OpenPGP using GPGMail
