Hi, On Tue, 2009-04-28 at 13:54 -0400, Jim Fulton wrote: > Thanks again! > > (Note to everyone else, Shane and I discussed this on IRC, along with > another alternative that I'll mention below.) > > I like version 2 better than version 1. I'd be inclined to simplify > and it and skip the configuration flag and simply publish an event any > time we see a cross-database reference when saving an object. > > Here's proposed solution 3. :) > > - We add a flag to disable new cross-database references unless they > are explicitly registered. > - We add a connection method to register a reference: > > def registerCrossDatabaseReference(from_, to): > "Register a new cross-database reference from from_ to to." > > - We arrange that connections can recognize old cross-database > references. > > If someone accidentally creates a new reference and the flag is set, > then transaction will be aborted. > > An interim step, if we're in a hurry to get 3.9 out, is to simply add > the flag. This would disallow cross-database references in new > applications. These applications could still support multiple > databases by providing application-level traversal across databases.
I think I'm reading something incorrectly: is there an emphasis on "*new* applications"? The flag would disallow the creation of cross-database references for a given DB -- independent of whether the app is new or old, right? Only depending on whether the application uses a ZODB that has the feature and has it enabled. Right? Otherwise, I'm +1. Christian -- Christian Theune · c...@gocept.com gocept gmbh & co. kg · forsterstraße 29 · 06112 halle (saale) · germany http://gocept.com · tel +49 345 1229889 7 · fax +49 345 1229889 1 Zope and Plone consulting and development
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