Since ModelChoiceField validates that the given id exists in the queryset,
there can be no valid choices when you use MyRelatedClass.objects.none().
Try MyRelatedClass.objects.all() or filter by some attribute. If the
queryset depends on some user input or conditions you can use something
like:
def __init__(self, some_value, *args, **kwargs):
super(MyForm, self).__init__(*args, **kwargs)
qset= MyRelatedClass.objects.filter(some_field=some_value)
self.fields['myrelation '].queryset = qset
Martin
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