How to update djangocms-blog post extensions fields position?

I have some post extensions adding new fields in my Posts objects.

I created the migration, launched my website, and I thought that maybe customizing the fieldsets would allow me to customize the position of the post extensions fieldset too.

That didn't seems to be the case. I created a new SmallIntegerField named my_new_field in a PostExtension class that I registered using blog_admin.register_extension(PostExtensionInline) (I also created the PostExtensionInline class by following the doc).

I added a breakpoint in my update_fields function that I'm using to update the order of the fields of my posts (see this SO question and its answer for more infos on this), and I can't find any mention to my_new_field in the fgets arg:

Quit the server with CONTROL-C.
> /home/me/my-test-app/my_test_app/update_fields.py(3)update_fields()
-> return fsets
(Pdb) l
  1     def update_fields(fsets, request, obj):
  2         breakpoint()
  3  ->     return fsets
[EOF]
(Pdb) fsets
[(None, {'fields': ['title', 'subtitle', 'slug', 'publish', 'categories', 'abstract', 'sites', 'author']}), ('Info', {'fields': [['tags', 'related'], ['date_published', 'date_published_end', 'date_featured'], 'app_config', 'enable_comments'], 'classes': ('collapse',)}), ('Images', {'fields': [['main_image', 'main_image_thumbnail', 'main_image_full']], 'classes': ('collapse',)}), ('SEO', {'fields': [['meta_description', 'meta_title', 'meta_keywords']], 'classes': ('collapse',)})]

How can I update my field position? (see edit below)

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edit: I can't think of a way to tweak the order of the post extension fields. But I realized that my real problem (yeah yeah that's a case of XYproblem) is that I want conditional inline (only include the post extension for a certain apphook that's using a defined BlogConfig instance.

How to conditionally add the inline post extension form/fields to my admin create form based on the BlogConfig instance?

So I figured it out (and it's not pretty, but it works).

I added those lines in my admin.py:

# replace PostAdmin get_inlines function in order to hide event_date on regular blog posts
from djangocms_blog.admin import PostAdmin
from .misc import get_inline_instances as patched_get_inline_instances
PostAdmin.get_inline_instances = patched_get_inline_instances

And here's my code on misc.py:

def get_inline_instances(self, request, obj=None):
    from djangocms_blog.cms_appconfig import BlogConfig
    from djangocms_blog.admin import PostAdmin
    from json import loads

    inline_instances = super(PostAdmin, self).get_inline_instances(request, obj)

    if "app_config" in request.GET:
        # get blog config instance from request
        blog_config = BlogConfig.objects.filter(pk=request.GET["app_config"])
        # get config from saved json
        config = loads(blog_config.values()[0]["app_data"])
        # get template_prefix from config

        if config:
            template_prefix = config['config']['template_prefix']
            if template_prefix == "djangocms_blog_agenda":
                return inline_instances
    return []

I used the template_prefix value in a BlogConfig instance of djangocms_blog to update the code based on the request:

• If we have "djangocms_blog_agenda" in the template_prefix, then return the inline instances.
• If we don't have this (default BlogConfig, another BlogConfig that do not need my current post extension fields), return an empty list.

The result can be viewed here:

Blog posts list screenshot, we can see that the articles are displayed by most recent "published date" first.

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We can select our blog config after a click on "Blog > Add Post...".

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Agenda post creation screenshot, we can see that there's a post extension named "event date" (not present in Blog post creation screenshot).

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Agenda list screenshot, we can see that the "events" are displayed by nearest future "event date" date.