Update DataGridField with RelationChoice column -> 'NO_VALUE' object has no attribute 'getPhysicalPath'

[zopyx (Andreas Jung)]

Likely related to my own question to the same issue. However the solution discussed here does not work in the context of the submodel of the DataGridField

AttributeError: 'NO_VALUE' object has no attribute 'getPhysicalPath'

We have this RelationChoice field (Python 3, Plone 5.2.1) directives.widget( 'reference', RelatedItemsFieldWidget, pattern_options={ 'selectableTypes': ['Document', 'Link', 'File'], 'basePath': '/', 'favorites': [], }, ) reference = RelationChoice( title=_(u'Reference'), vocabulary='plone.app.vocabularies.Catalog', required=False, ) which leads to Traceback (innermost last): Module ZP…