Hi Martin
> -----Ursprüngliche Nachricht----- > Von: zope3-users-boun...@zope.org > [mailto:zope3-users-boun...@zope.org] Im Auftrag von Martin Aspeli > Gesendet: Dienstag, 7. April 2009 16:17 > An: zope3-users@zope.org > Betreff: [Zope3-Users] z3c.form: LookupErrors > > Hi, > > In z3c.form (at least with 1.9.0), if you have a Choice field > and the vocabulary changes so that an existing value (or the > default value on an add form) is no longer valid, you get a > LookupError: > > Module z3c.form.form, line 126, in updateWidgets > Module z3c.form.field, line 259, in update > Module z3c.form.browser.select, line 51, in update > Module z3c.form.browser.widget, line 61, in update > Module z3c.form.widget, line 182, in update > Module z3c.form.widget, line 120, in update > Module z3c.form.converter, line 258, in toWidgetValue > Module z3c.form.term, line 31, in getTerm > Module zope.schema.vocabulary, line 124, in getTerm > > It'd be nicer if z3c.form would catch the error and return > field.missing_value or something like that. As it stands, if > this happens with a content object, it's impossible to reach > the edit form and fix the value! This is a legacy data problem. Such data need to get migrated by a generation if a value is no longer valid. Otherwise the wrong (not valid) value is still used in the app. It doesn't make sense to just skip invalid values and fallback to missing_value in the vocabulary widget since this value get used by everthing else then the widget. But probably if legacy data are not a problem in some apps, we should implement a vocabulary and widget which can handle such legacy data problems or make it a configurable option. I also was thinking about a widget which allows to define depreated values which are valid but not shown for selecting. this whould allow to skip values fer a future selection. Probably this whould require a enhanced vocabulary implementation which offers a deprecated value list or something like that. What do you think? Whould this fit for you? Regards Roger Ineichen > Martin > > -- > Author of `Professional Plone Development`, a book for > developers who want to work with Plone. See > http://martinaspeli.net/plone-book > > _______________________________________________ > Zope3-users mailing list > Zope3-users@zope.org > http://mail.zope.org/mailman/listinfo/zope3-users > _______________________________________________ Zope3-users mailing list Zope3-users@zope.org http://mail.zope.org/mailman/listinfo/zope3-users