How to Create Django Admin List Actions - Apply 10% discount and Export to csv

How to Create Django Admin List Actions - Apply 10% discount and Export to csv

All Django Admin list views already a default action Delete selected.

In this short tutorial I will show how create your own list actions.

Database Table
CREATE TABLE books (
id INTEGER PRIMARY KEY,
title VARCHAR (50),
publication_date DATE,
author VARCHAR (30),
price DECIMAL,
pages INTEGER (11),
book_type INTEGER
);


models.py

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#models.py from django.db import models   class Book(models.Model):     FANTASY = 1     MYSTERY = 2     ROMANCE = 3     BOOK_TYPES = (         (FANTASY, 'Fantasy'),         (MYSTERY, 'Mystery'),         (ROMANCE, 'Romance'),     )     title = models.CharField(max_length=50)     publication_date = models.DateField(null=True)     author = models.CharField(max_length=30, blank=True)     price = models.DecimalField(max_digits=5, decimal_places=2)     pages = models.IntegerField(blank=True, null=True)     book_type = models.PositiveSmallIntegerField(choices=BOOK_TYPES)         class Meta:         db_table = 'books'

admin.py

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#admin.py from django.contrib import admin   import decimal, csv   from django.http import HttpResponse from django.db.models import F   from myapp.models import Book     def export_books(modeladmin, request, queryset):     response = HttpResponse(content_type='text/csv')     response['Content-Disposition'] = 'attachment; filename="books.csv"'     writer = csv.writer(response)     writer.writerow(['Title', 'Publication Date', 'Author', 'Price', 'Pages', 'Book Type'])     books = queryset.values_list('title', 'publication_date', 'author', 'price', 'pages', 'book_type')     for book in books:         writer.writerow(book)     return response export_books.short_description = 'Export to csv'     class BookAdmin(admin.ModelAdmin):     list_display = ['title', 'publication_date', 'author', 'price', 'book_type']     actions = ['apply_discount', export_books]       def apply_discount(self, request, queryset):         queryset.update(price=F('price') * decimal.Decimal('0.9'))     apply_discount.short_description = 'Apply 10%% discount'   admin.site.register(Book, BookAdmin)