Initial value in ModelSelect2MultipleWidget (Many to Many field)

[jose-gomez-evinex]

Hello,

Sorry about this, I guess this is a very basic question/issue but I can't make it work 😭

I'm trying to use a MultipleChoiceField field to multi-select product categories in a form. That is working, but I can't make the select2 dropdown to show the initial categories. It always appear empty (no selected items)

This is my form:

class ProductForm(ModelForm):
    categories = forms.MultipleChoiceField(
        widget=s2forms.ModelSelect2MultipleWidget(
            queryset=ProductTerm.objects.none(),
            search_fields=['producttermmeta__value__icontains'],
        )
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        product = self.instance
        self.fields['categories'].widget.queryset = ProductTerm.objects.filter(taxonomy=ProductTerm.CATEGORY, storage=product.storage)

        self.initial['categories'] = product.categories.all()  # attempt 1
        self.fields['categories'].initial = product.categories.all()  # attempt 2
        self.fields['categories'].widget.initial = product.categories.all()  # attempt 3
        pass

    class Meta:
        model = Product
        fields = ['categories']