I was able to resolve this by overriding `clean()` instead of
`to_python()`. In there, I've the set correct queryset to use for
validation.
I still could not explain why `to_python()` is not called.
On Saturday, November 20, 2021 at 8:38:47 AM UTC+8 Earl Lapus wrote:
> Hi,
>
> I have a ModelForm that has a ModelMultipleChoiceField. In the said field,
> I've set the queryset to none and assigned the FilteredSelectMultiple as
> the widget for the field.
>
> It looks like this:
>
> class MyForm(forms.ModelForm):
> myfield = ModelMultipleChoiceField(
> queryset=SomeModel.objects.none(),
> widget=admin.widgets.FilteredSelectMultiple('SomeModel', False),
> required=False
> )
>
> I added some javascript on the template to dynamically add items to the
> widget based on a value from another field. That part already works. But, I
> am running into an error during submit - validation error. An example error
> I get is: *"Select a valid choice. 4 is not one of the available
> choices." *This is expected since I've set the queryset to be empty, so
> values will match during validation.
>
> Where should I override the validation? I tried creating a
> ModelMultipleChoiceField child class and implemented the `to_python()`
> method but it seems like that method is not called. Is there any
> documentation that can help me arrive at an answer for this?
>
> Cheers,
> Earl
>
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