Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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[画像: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: def wrapper (request, *args, **kwargs) : 13: 14: 15: 16: 17: try: 05: 06: 07: 08: 09: 10: @fetch_author 11: def books_new (request) : 12: 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 books = Book.objects.filter (authors_in= [author], year_gte="2015") context = { "title": "New books", "books" : books, return render (request, "books-recent.html", context) Identify the three lines which contain the three bugs: O Lines 5, 8 and 10 O Lines 7, 11 and 12 O Lines 5, 7 and 12 O Lines 5, 8 and 11 O Lines 10, 11 and 12 O Lines 7, 8 and 10]
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Transcribed Image Text: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: def wrapper (request, *args, **kwargs) : 13: 14: 15: 16: 17: try: 05: 06: 07: 08: 09: 10: @fetch_author 11: def books_new (request) : 12: 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 books = Book.objects.filter (authors_in= [author], year_gte="2015") context = { "title": "New books", "books" : books, return render (request, "books-recent.html", context) Identify the three lines which contain the three bugs: O Lines 5, 8 and 10 O Lines 7, 11 and 12 O Lines 5, 7 and 12 O Lines 5, 8 and 11 O Lines 10, 11 and 12 O Lines 7, 8 and 10
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