[Solved] What is wrong with this code snippet?authors = Author.objects.prefetch_related(books) for author in authors: print(author.books.all()) | Django

Django - Caching

What is wrong with this code snippet?

authors = Author.objects.prefetch_related(books)
for author in authors:
    print(author.books.all())

AThe loop should use select_related instead of prefetch_related.

BThe argument to prefetch_related should be a string, not a variable.

Cprefetch_related cannot be used on reverse relations.

Dauthor.books.all() is invalid syntax.

Step-by-Step Solution

Solution:

Step 1: Check prefetch_related argument type
The argument must be a string with the relation name, not a bare variable.
Step 2: Confirm usage of prefetch_related on reverse relations
prefetch_related works on reverse relations correctly.
Final Answer:
The argument to prefetch_related should be a string, not a variable. -> Option B
Quick Check:
prefetch_related argument must be string = C [OK]

Quick Trick: Always quote relation names in prefetch_related [OK]

Common Mistakes:

MISTAKES

Master "Caching" in Django

9 interactive learning modes - each teaches the same concept differently

More Django Quizzes

What is wrong with this code snippet?