[SOLVED] Making references in RelatedItemsFieldWidget orderable?

Plone Support Add-on Development
1

We have a 1:N reference field defined as

    widget(
        'images',
        RelatedItemsFieldWidget,
        pattern_options={
            'selectableTypes': ['Image']
        }
    )

    images = RelationList(
        title=_(u"Images"),
        default=[],
        value_type=zope.schema.Choice(
            title=_("Image"),
            required=True,
            vocabulary='plone.app.vocabularies.Catalog'),
        required=False)

for choosing images.

How can you make the images references reorderable?

2

If you use value type RelationChoice it should be possible to drag them in the right order

3

...or setting pattern_options="orderable".

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