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

iirc an empty choice field returns an emty list not None

On 1 March 2015 at 19:00, Andreas Mantke <[email protected]> wrote:
> 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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