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

Hello David,

Am 05.03.2015 um 08:06 schrieb David Glick (Plone):
> 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
>> def noCategoryChoosen(data):
>>      if data.category_choice == []:
>>           raise MissingCategory(_(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
> )

thanks for that hint. The option with a constraint is much better. The
user get the error message near to the field where his input is missing.

Regards,
Andreas

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