Here is how I accomplished this with a ModelForm
class VariationForm(forms.ModelForm):
option_values =
forms.ModelMultipleChoiceField(queryset=Value.objects.none(),
widget=CheckboxSelectMultiple(), required=False)
class Meta:
model = Variation
def __init__(self, *args, **kwargs):
super(VariationForm, self).__init__(*args, **kwargs)
if 'instance' in kwargs:
self.fields['option_values'].queryset =
kwargs['instance'].product.values.all()
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