Prepopulated_fields doesn't work for admin.StackedInline.

[ChristosKon]

I think that I found a bug (new to Django)

Prepopulated_fields doesn't work for StackedInline class while it works fine for TabularInline class.

Please let me know if you need any more information.

[Tim Graham]

I tested with a a simple project and couldn't reproduce a problem. Please provide more details.

[Ryan Siemens]

Reopening as I ran into this issue (at least similar) today. Some additional info:

The prepopulated_fields will work for the extra forms specified, in the inline, but any additional forms added via "Add another <Model>" will not run the js that pre populates the field.

class ArticleInline(admin.StackedInline):
    model = Article
    extra = 2
    # will only prepopulate the ``slug`` field for the 2 ``extra`` forms
    # in the formset
    prepopulated_fields = {"slug": ("title",)}

Verified this issue is happening in 2.1 and 1.11 and attached a minimal project that reproduces the issue.

To reproduce:

1. extract the attached project
2. run the migrations
3. create a superuser
4. navigate to admin/myapp/blog/add/
5. adding a title to extra forms in the the stacked inline articles prepopulates the slug field
6. click "Add another Article"
7. ASSERT adding a title the newly added stacked inline article form does not prepopulate the slug field

Here is a screen grab showing the results of steps 5-7 ​https://zappy.zapier.com/22F716E5-1D64-4763-B731-DE62D24F8FC0.mp4

[Ryan Siemens]

Minimal project to reproduce issue

[Simon Charette]

Thanks for the very detailed reproduction case Ryan.

[Mariusz Felisiak]

​PR

[Jakob Köhler]

I added a test for the scenario defined by Ryan ✅

[Zoltán Szatmáry]

Yesterday I made a PR for this one. ​https://github.com/django/django/pull/14967
It only required changes in the inlines.js file.

[Shubh Parmar]

Since there is no updates regarding this ticket for weeks, I want to work on it.

[Shubh Parmar]

PR: ​https://github.com/django/django/pull/15091

[Mariusz Felisiak <felisiak.mariusz@…>]

In bb223c6:

Fixed #28357 -- Fixed ModelAdmin.prepopulated_fields on newly added stacked inline.

Thanks Jakob Köhler for the initial patch.