Inline Model Admin

You can display related models inline with the parent model by using InlineModelAdmin. This is useful for managing related objects directly within the admin interface.

1. Inline Registration Example: Suppose we have a Publisher model, and a Book model with a foreign key relationship to Publisher. You can display Book records directly inside the Publisher admin page.First, create an inline admin for Book:

   from django.contrib import admin
   from .models import Publisher, Book
   
   class BookInline(admin.TabularInline):
       model = Book
       extra = 1  # Number of empty forms displayed for the user to add new books
   
   class PublisherAdmin(admin.ModelAdmin):
       inlines = [BookInline]
   
   admin.site.register(Publisher, PublisherAdmin)
   

Customizing the Admin Action

Admin actions allow you to define custom actions that can be applied to multiple objects at once.

1. Defining an Action:

   def mark_as_published(modeladmin, request, queryset):
       queryset.update(is_published=True)
   
   mark_as_published.short_description = "Mark selected books as published"
   
   class BookAdmin(admin.ModelAdmin):
       actions = [mark_as_published]
   
   admin.site.register(Book, BookAdmin)
   

2. Executing Actions: Once registered, the action appears in a dropdown menu in the list view of the admin panel, allowing administrators to select multiple records and apply the action.