Choice field not required: Constraint not satisfied

Plone Support Add-on Development
1

I created a behavior with the following field definition:

mfolder = schema.Choice(
    title=u"Source Folder Mobile",
    vocabulary='plone.app.vocabularies.Catalog',
    required=False,
)

directives.widget('mfolder'
                  , RelatedItemsFieldWidget
                  , pattern_options={
        'recentlyUsed': True,
        'mode': 'search',
        'maximumSelectionSize': 1,
        'selectableTypes': ['Folder'],
        }
)

The choice should not be required. It works fine if I select a content relation, but leaving it empty responses with:
"Constraint not satisfied"

image

What am I doing wrong.

Plone 5.2.9
plone.app.z3cform 3.2.4

2

Try using the RelationChoice field from z3c.relationfield.schema

This may be helpful: 37. Relations – Mastering Plone 5 Development — Plone Training 2022 documentation

3

Great, that works. Thanks for the help!!!