use query.options(extension(MyExtension())) On Mar 13, 2007, at 12:53 PM, percious wrote:
> > I think I came up with a decent solution for this: I do something > like: > > extension = MyMapperExtension() > for mapper in mapper_registry.values(): > mapper.extension = extension > mapper._compile_extensions() > > If you want all classes currently defined in the metadata to map to > your new extension. This is actually working quite well. > > cheers. > chris > > On Feb 9, 11:33 am, "Michael Bayer" <[EMAIL PROTECTED]> wrote: >> I should add that you *can* be more creative, and construct each >> mapper >> with aMapperExtensionat the beginning which later can be "enabled" >> with >> a "hello world" callable. i.e. >> >> class MyExt(MapperExtension): >> def __init__(self): >> self.func = None >> def after_insert(self, ...): >> if self.func: >> self.func() >> >> extension = MyExt() >> mapper(foo, bar, extension=extension) >> mapper(foo2, bar2, extension=extension) >> mapper(foo3, bar3, extension=extension) >> >> ... do stuff ... >> >> def helloworld(): >> print "hello world" >> extension.func = helloworld >> >> ... do stuff ... >> >> percious wrote: >> >>> question. >> >>> Lets say I have a series of table definitions, and a series of >>> objects >>> linked to the tables with a bunch of mappers. >> >>> First question: Is there a way to get from the table definitions in >>> the metadata to the Mapper? >> >>> Second question: If I create aMapperExtension, can I then link >>> it to >>> the mapper associated with a table? >> >>> What I want to do is create a simple application that goes >>> through the >>> tables defined within a metadata, and create an extension so that >>> every time a table entry is added it prints 'hello world' to the >>> screen. >> >>> TIA >>> -chris > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
