add ModelAdmin.get_inlines() hook to allow set inlines based on the request or model instance.

[WeizhongTu]

add ModelAdmin.get_inlines() hook to allow set inlines based on the request or model instance.
Currently, We can override the method get_inline_instances to do such a thing, but a for loop should be copied to my code. So I wished add a hook get_inlines(request, obj=None)

[Tim Graham]

Are you going to offer a patch to show exactly what you have in mind? I'm not immediately convinced that another hook is needed since the cost of duplicating a for loop is not that great.

[WeizhongTu]

If I want to realize a dynamic inlines based on the request or model instance. I need to override get_inline_instances to do it.
What I want to do is just set self.inlines to dynamic values according to different person or object. not inline instances, so I advise to add a new hook get_inlines(request, obj=None) to finish such a thing.

I've created a new pull request here: ​​https://github.com/django/django/pull/7920.

[Tim Graham]

I guess it's useful. The patch needs some improvement (tests, some doc fixes such as release notes) as per the PatchReviewChecklist.

[Mariusz Felisiak <felisiak.mariusz@…>]

In 917fd9d0:

Fixed #27755 -- Added ModelAdmin.get_inlines() hook.