[Zope3-Users] Formlib and invariants?

[Bernd Dorn]

On 04.05.2006, at 13:35, Gary Poster wrote:

>
> On May 3, 2006, at 11:51 PM, Bernd Dorn wrote:
>
>> yes, this should really be fixed up in the default implementation  
>> of formlib
>>
>> because interface.Invalid has no registered multiadapter to
>>  zope.app.form.browser.interfaces.IWidgetInputErrorView
>>
>> you have to raise a WidgetInputError
>>
>> an example for such an error:
>>
>> from zope.schema import Datetime,Bool,ValidationError
>> from zope.app.form.interfaces import IWidgetInputError
>>
>> class FromGreaterThanTo(ValidationError):
>>     u"""From-Date is after To-Date"""
>>
>>     # this is needed to adapt to a view for formlib
>>     implements(IWidgetInputError)
>
> Well, you can raise any error from an invariant that  
> extends...zope.interface.Invalid, maybe?  The invariant interface  
> says what is allowed somewhere in zope.interface.
>
> ...I suppose we could have a generic view for Invalid errors that  
> simply said "This is invalid, try again"?  Doesn't seem very useful  
> to me.
>
> You are responsible for making sure you have a reasonable exception  
> view of an exception you raise.  I'm inclined to think that this is  
> a documentation bug at worst.
>

yes, because in form.txt Invalid is used directly, wich implies that  
this should work



> Gary