Allow more precise placement of admin inlines

[Jeff Blaine <jblaine@…>]

I just had to copy django/contrib/admin/templates/admin/change_form.html (bad!) for wholesale replacement in my site for an easily fixable reason: I wanted my TabularInline to show at the top of the change form for my model, not at the bottom.

Inlines are for composition of a form, they're not a second-class citizen like "related objects". As such, I believe there should be a way to allow someone to at least choose top or bottom.

[Julien Phalip]

I agree. It would be even better if one could insert inlines between fieldsets.

[Jeff Blaine]

For the top/bottom case (not arbitrary placement), there appears to be a pretty simple solution from my digging around.

Add a 'position' class variable to InlineModelAdmin (just like 'extra'). From there, it's a matter of tweaking the template(s) to have a top and bottom loop over the standard inline_admin_formsets, but include a conditional that checks for 'top' (or whatever) in the top loop, and 'bottom' in the bottom loop.

If that's not feasible, it's less simple, but not a total nightmare. I think add_view() and change_view() would need to be tweaked in contrib/admin/options.py to build both top_inline_admin_formsets and bottom_inline_admin_formsets (with corresponding template tweaks).

Just offering what I dug up. Don't assume I have any real clue.

EDIT: No idea why my update above unset "Easy pickings". I didn't do it!

[Hodson]

Here is some work I did on making this possible: ​https://github.com/django/django/pull/793

When defining your Admin Inline in admin.py you simply set "display_at_top = True" and this will now cause the inline to display at the top of the page.

If you do not define "display_at_top" it just defaults to displaying at the bottom.

[frnhr]

Duplicate of #4848