Open multiselectize field in prefillPartial

[amikphoto]

When I open DialogModelForm with activate(prefillPartial(DishSet.dish_form.dish_fk)) I got filled form to edit the dish parameters as needed, but I have manytomany field in this form and It doesn't filled correct. Is it correct?
Could you add SelectizeMultiple in prefillPartial?

[amikphoto]

I can't set a multi value in the form that opens via activate(prefillPartial... Could you help?

[jrief]

I fixed some issues here. Can you please check if https://django-formset.fly.dev/bootstrap/issue-many works for you?

[amikphoto]

yes, It's great but I interested why when I open DialogModelFrom with selectizemultiple over activate(prefillPartial( all fields opened correct but not ManytoMany field.). When I change the value in the form on which the data in the modal form depends, all the data changes except selectizemultiple.

[amikphoto]

When I load a formset for editing an object and press the "edit" button that runs activate(prefillPartial(DishSet.dish_form.dish_fk)) then ModelDIalogForm opens with all fields filled in (including manytomany). But if I change the value in DishSet.dish_form.dish_fk in the loaded formset, then in this case when opening ModelDialogForm all fields change except manytomany. This is a problem.

[jrief]

Please share your code in a way, so that I can run it out of the box. Maybe then I understand the problem.

[amikphoto]

This is all my project https://github.com/amikphoto/foodster
I have a class DishForm(ModelForm) in my forms.py. It has a button edit_dish:
edit_dish = Activator(
label="Редактировать",
# required=False,
widget=Button(
action='activate(prefillPartial(DishSet.dish_form.dish_fk))',
# button_variant=ButtonVariant.SECONDARY,
attrs={
'df-disable': '!DishSet.dish_form.dish_fk',
'df-hide': '!DishSet.dish_form.currentuser',
'class': 'w-100 btn-outline-secondary',
}
),
)

It opens the modal form ChangeDishLibraryForm(DialogModelForm):
This from has field: CulinaryClassModel_fk': SelectizeMultiple(search_lookup='name__icontains'),
When I open this formset it started with correct initial values but when I start to change DishSet.dish_form.dish_fk in DishForm I'm waiting that CulinaryClassModel_fk will change too. All fields in ChangeDishLibraryForm changed but not manytomany field CulinaryClassModel_fk.

This is problem

[amikphoto]

Issue: prefillPartial fails to correctly populate django-selectize fields for ManyToManyFields

Description:
When using prefillPartial to populate a form (e.g., in a modal dialog) with data that includes a ManyToManyField, the django-selectize widget for that field is not correctly updated with the selected values received from the server. While the server correctly serializes the M2M field into a list of primary keys (e.g., "CulinaryClassModel_fk": [1, 2, 4]) and sends it in the JSON response, the client-side prefillPartial logic fails to apply this array of values to the select[multiple] element managed by django-selectize.

Specifically, the existing prefillPartial implementation in DjangoFormset.ts only handles setting values for fields where the value is a string or number. It lacks the specific logic required to process an array of values for HTMLSelectElements, particularly those enhanced with the django-selectize custom element.

This leads to the field visually appearing empty/unpopulated, even though the data was sent by the server. Subsequently, if the form validation relies on the DOM state (e.g., checking option.selected or using the browser's checkValidity), it might incorrectly flag the required M2M field as empty, causing UI flicker or validation errors.

The prefillPartial method in DjangoFormset.ts does not contain logic to handle select[multiple] elements populated by django-selectize when the incoming data value is an Array.

To solve this problem I have to modify prefillPartial in djangoformset.ts