Re: [SOLVED] Deexterity: Validation of multiselection Field with input from Vocabulary

Am 06.04.2015 um 17:19 schrieb Andreas Mantke:
> Hello,
>
> Am 05.03.2015 um 21:35 schrieb Andreas Mantke:
>> Hello David,
>>
>> Am 05.03.2015 um 08:06 schrieb David Glick (Plone):
>>> (...)

>>> 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
>>> e
>>> 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.
>>
> although this worked in the past it failed currently. I always get a
> red error message for the list-choice fields.
>
> I used a buildout with Plone 4.3.4  and Invalid from zope.interface-3.6.7.
>
> I tried with two other field types (schema.Text and schema.TextLine)
> with the same issue. I can't get Invalid/constraint satisfied. The
> same with a schema.Int field.
>
> Thanks for any hint in advance.

I fixed the issue. The function needed another line at the end:

'return True'


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


Regards,
Andreas

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