On Mon, 29 Mar 2010 14:59:12 -0400, Leonard Richardson <[email protected]> wrote: > > > >> > IBranchTarget has several implementations, one for each of product, > > >> > sourcepackage, person, and productseries. I want the method to be only > > >> > available on the first two if possible, but it's fine if it has to be > > >> > all four, as it is part of the interface after all. > > Assuming I understand what you're trying to do, the simplest way to > represent this would be to define an annotation like > @import_from_adapter() and put @import_from_adapter(IBranchTarget) in > IProduct and ISourcePackage, while leaving it out of IPerson and > IProductSeries. > > In IBranchTarget you would have an annotation like > @only_used_in_adaptations that would stop it from being exported as a > separate entry type. You would publish IBranchTarget.name as > "branch_target_name" (or whatever you wanted) to avoid colliding with a > 'name' declared in IProduct or ISourcePackage. The same would hold true > for IBranchTargetName's named operations. You can choose whatever name > you want, but if that name conflicts with a name found in the original > interface, the original interface takes precedence. > > The end result would be 'product' and 'source_package' looking like they > had everything that's @exported in IBranchTarget. Behind the scenes, a > product or source package would be adapted to IBranchTarget to retrieve > values like 'branch_target_name'. A PATCH that modified (eg.) both name > and branch_target_name would make both object modifications within a > single database transaction. > > Would this work? (This is not something I can get to anytime soon, BTW.)
That sounds like it would work fine for me. It's clearly more work than a small mixin, so is it worth the effort to do this? Are there other adapters that we may want to expose? Is it a pattern that will grow in usage in the LP codebase? Thanks, James _______________________________________________ Mailing list: https://launchpad.net/~launchpad-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~launchpad-dev More help : https://help.launchpad.net/ListHelp
