radio button widget for Dexterity-based content types?

Question

in Archetypes-based content types if a vocabulary used on a choice field has less than certain number of items (5, IIRC) the widget used is a radio button input instead of a select list.

in Dexterity-based content types there's no such behavior and the select list is always used.

is there any way to force a radio button input?

I tested the following but is not working and I can't find any documentation available:

from z3c.form.browser.radio import RadioWidget

class IMyType(form.Schema):
    form.widget(my_field=RadioWidget)
    my_field = schema.Choice(
        title=_('My field'),
        vocabulary=my_choices,
        required=True,
    )

I'm using Plone 4.2 and plone.autoform 1.3.

Answer 1

You can specify a custom widget like this in plone.autoform 1.4 and above.

In earlier versions of plone.autoform you need to specify a "field widget" (a callable that produces a widget when called) instead of a widget class. (plone.autoform 1.4 supports either one, and some other things covered in its documentation.) In this case you would use z3c.form.browser.radio.RadioFieldWidget.