[Zope-dev] ZPatterns alpha 5 released

[Phillip J. Eby]

Here's the details from the CHANGES file:

New Features/Bug Fixes in 0.4.0alpha5

 - Property Sheets for DataSkin-based ZClasses.  Now you can put define
   property sheets on a ZClass and still use AttributeProviders for the
   properties.  Just add a "DataSkin Property Sheet" to your ZClass
   instead of a "Common Instance Property Sheet".  (Note: you can only do
   this with *new* DataSkin-derived ZClasses.  If you have an already
   existing ZClass, you must either re-create it by hand or do the 
   "setbasesholdontoyourbutts" hack to re-create the ZClass.)

 - GenericTriggers now also pass a variable "ORIGINAL" which is a
   dictionary of the original values of changed attributes (or NOT_FOUND
   if the attribute did not exist before changing).  Note that if the
   values are complex or mutable, they cannot be guaranteed to be truly
   the same as their starting state, so this should really only be used
   for simple atomic values like strings and numbers.

 - Numerous bug fixes, including:

   - Specialists were always returning the result from the first Rack

   - setuid support for LoginManager was broken, and also didn't deal
     with executable-owner masking

   - _DelAttributeFor() was broken for persistently-stored attributes

   - Deleting a non-existent attribute no longer flags the attribute as
     changed

   - _constructPlugIn() was broken with latest 2.2 version that binds
     constructors to their products/factories

   - In the latest Zope, setting ownership after adding was causing a
     Changed event to fire instead of an Added event.