[Product-Developers] Dexterity: make a list field required
sdupton at gmail.com
Wed Dec 5 22:04:25 UTC 2012
On Wed, Dec 5, 2012 at 11:56 AM, Mikko Ohtamaa
<mikko+plone at redinnovation.com> wrote:
> On Wed, Dec 5, 2012 at 8:50 PM, Christian Ledermann
> <christian.ledermann at gmail.com> wrote:
>> I try to make a list filed required for a dexterity type:
>> layers = schema.List(
>> description=_(u"WMS Layers"),
>> but when I save the edit form it does not complain wether
>> the list field is filled or not
> My gut feeling is that it validates "list object" not "list length".
> Is there a validator which allows you to the require the minimum length of
> the list (probably not)?
Use a constraint, start with something that looks like:
>>> from zope import schema
>>> field = List(value_type=Int(), constraint=lambda v:len(v)>0, required=True)
Traceback (most recent call last):
I assume this should work, but have not tested with forms.
More information about the Product-Developers