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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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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