Python decorators can be used in Django in order to avoid duplication of code in view functions. For instance, consider the following definition of a decorator that is then applied to a view function. This code has three bugs: 01: def fetch_author (view_func) : 02: 03: 04: 05: 06: 07: 08: def wrapper (request, *args, **kwargs) : try: author = Author.objects.get(id-request.GET["author_id"]) view_func (request, author, *args, **kwargs) except Author. Does NotExist: return bad_request (request, Author. Does NotExist) return view_func 09: 10: @fetch_author 11: def books_new (request) : 12: 13: 14: 15: 16: 17: } books = Book.objects.filter (authors___in=[author], year_gte="2015") context = { "title": "New books", "books" : books, return render (request, "books-recent.html", context)

Python decorators can be used in Django in order to avoid duplication of code in view functions. For instance, consider the following definition of a decorator that is then applied to a view function. This code has three bugs: 01: def fetch_author (view_func) : 02: 03: 04: 05: 06: 07: 08: def wrapper (request, *args, **kwargs) : try: author = Author.objects.get(id-request.GET["author_id"]) view_func (request, author, *args, **kwargs) except Author. Does NotExist: return bad_request (request, Author. Does NotExist) return view_func 09: 10: @fetch_author 11: def books_new (request) : 12: 13: 14: 15: 16: 17: } books = Book.objects.filter (authors___in=[author], year_gte="2015") context = { "title": "New books", "books" : books, return render (request, "books-recent.html", context)

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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