About Admin List Filter with Options Limited to Existing Relations

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from django.contrib import admin
from django.contrib.admin import RelatedOnlyFieldListFilter
from .models import Post

@admin.register(Post)
class PostAdmin(admin.ModelAdmin):
    list_filter = [
        ("categories", RelatedOnlyFieldListFilter),
    ]

Programming Development Django 4.2 Django 3.2 Django 2.2

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