Hello everyone, the following helper functions in zope.app.component do not work well with the new registry concept of bases: getNextSiteManager, queryNextSiteManager, getNextUtility, queryNextUtility.
Those methods expect a simple lookup tree, where the first base of a local registry is the registry its parent's site manager's registry or the global registry; in other words, always the first base is selected (line 45). Since I started using the baseregistry, I commonly add the base registries at the first position, since I want them to override the global and other parent registries. Doing so breaks all components that use the above helper functions. Here is the solution I am going to check in later today: - get/queryNextSiteManager These functions will be deprecated, since they simply make no sense with the current design of the registries. I have checked the core code and they are not used anywhere except for queryNextUtility. I suspect the same to be true for all 3rd-party code as well, so that deprecating them should not really hurt anyone. - get/queryNextUtility They are still very useful and their extensive use in the Zope 3 core code is proof of that. Luckily their fix is simple. Instead of using get/queryNextSiteManager to look up the next registry, we simply iterate through all the bases of the closest site manager until an answer is found. This way the lookup pattern will work as before and supports the new usage pattern. I have tested this fix and it works for my code well. The really big question is: Is that change worth porting to the Zope 3.3 branch? It really is a serious bug that will cause people painful error messages that are hard to understand. Also, it prevents people from using Zope 3.3 and z3c.baseregistry. Thanks for reading and any comments you might have! Regards, Stephan -- Stephan Richter CBU Physics & Chemistry (B.S.) / Tufts Physics (Ph.D. student) Web2k - Web Software Design, Development and Training _______________________________________________ Zope3-dev mailing list Zope3firstname.lastname@example.org Unsub: http://mail.zope.org/mailman/options/zope3-dev/archive%40mail-archive.com