Am 27.09.2007 um 05:35 schrieb Stephan Richter:
On Wednesday 26 September 2007 09:06, Michael Howitz wrote:
This solution requests that the back-end supports non-optimistic
save-points. But we can get rid of the Data class.
We'll start an implementation of the second approach on a branch of
z3c.form now to show if it works.
I really like the second approach, if you can get it working.
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.
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