[Zope3-dev] z3c.form: handling of interface invariants

[Michael Howitz]

Am 27.09.2007 um 10:37 schrieb Michael Howitz:
> After thinking it over we decided to implement the first approach  
> (change z3c.form.validator.Data to read the value of a field  
> missing in he form on the object).
>
> We put our changes into the branch gocept-invariants.
>
> The reasons to change our decision where the following:
>
> - the second approach (using save-points) requires save-point  
> support on the back-end and breaks without this support
>
> - using save-points would require to change the structure of  
> z3c.form: till now the complete validation is done by  
> z3c.form.field.FieldWidgets, using save-points validation gets  
> split up into validation of field contents in FieldWidgets and  
> validation of the invariants.
>   The validation of the invariants has to be implemented at least  
> twice: in AddForm and EditForm because saving form values is done  
> completely different in these classes. So someone creating a direct  
> subclass of z3c.form.form.Form has to do things again or we need  
> additional changes in the structure.
>
> Any thoughts?

As no-one had any further thoughts, I'll merge the branch into the  
trunk within the next few days.

-- 
Yours sincerely,
Michael Howitz

gocept gmbh & co. kg · forsterstrasse 29 · 06112 halle/saale
www.gocept.com · fon: +49 345 12298898 · fax: +49 345 12298891