Re: Deexterity: Validation of multiselection Field with input from Vocabulary

( I dont really know if this is a good idea9, but

Could you
• set the field to be required
• Let one of the options be «Please choose»
• Set «Please choose» as default
• validate the field for not (contains) «please choose»

Espen


1. mars 2015 kl. 20:01 skrev andreasma [via Plone] <ml-node+s293351n7573302h15-PKuAHvtXa09l57MIdRCFDg@public.gmane.org>:

> Hello,
> 
> I try to validate a Dexterity multiselection field that is created like this:
> 
> category_choice = schema.List(
>     title=_(u"Choose your categories"),
>     value_type=schema.Choice(source=vocabCategories),
>     required=True,
> )
> 
> 
> I tried to validate if this field is not empty. I wasn't successful by using @invariant with a function that raises an error message if data.category_choice is None.
> 
> 
> @invariant
> def noCategoryChoosen(data):
>     if data.category_choice is None:
>        raise MissingCategory(_(u"You must choose at least one category for your project"))
> 
> 
> 
> class MissingCategory(Invalid):
>     __doc__ = _(u"You have not chosen a category for the project")
> 
> 
> The test seemed to fail because the field has some value / data.
> 
> I tried the same with a constraint for the schema.List field with the same result.
> 
> Thanks for any hints in advance.
> 
> Regards,
> Andreas
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