Vs: how to override a ModelChoiceField in order to add FKs directly in a TextInput?

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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