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

On 3/2/15 11:25 AM, Andreas Mantke wrote:
> Hello Christian,
>
>
> Am 02.03.2015 um 10:37 schrieb Christian Ledermann:
>> iirc an empty choice field returns an emty list not None
> thanks for your hint. That helped me a lot.
> I got the issue in my validation and it works in a default Dexterity 
> form with now:
> @invariant
> defnoCategoryChoosen(data):
>       ifdata.category_choice == []:
>            raiseMissingCategory(_(u"You had to choose at least one category for your project."))
>
>
> But if I use a similar validation within a Dexterity, that contains form.fieldsets, it behaves different.
>
> If I add a new Dexterity object I could solve one error message (validation error) after another and could save my Dexterity object at least.
>
> But if I edit a former such object (with added validation feature now) I'm not able to save the changes (choose a value for the List-Choice-Field). The errors message stays in eternity.
>
Some more options to try:

1. set min_length=1 on the List field and zope.schema will validate it 
(but you won't get a custom validation message)

2. use a constraint on the field instead of an invariant on the schema

from zope.interface import Invalid

def isNotEmpty(value):
     if not value:
         raise Invalid(u'You must choose at least one category.')

category_choice = List(
     // ...,
     constraint=isNotEmpty
)

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