[Solved] What is wrong with this code snippet?posts = Post.objects.prefetch_related('comment_set') for post in posts: print(post.title, [c.text for c in post.comment_set.... | Django

Django - Caching

What is wrong with this code snippet?

posts = Post.objects.prefetch_related('comment_set')
for post in posts:
    print(post.title, [c.text for c in post.comment_set.all()])

Assuming Comment model has a ForeignKey to Post without a related_name set.

AUsing 'comment_set' is correct; no error here

BShould use 'comments' instead of 'comment_set' in prefetch_related

CMust use select_related instead of prefetch_related for reverse relations

DThe code will raise an AttributeError because 'comment_set' is invalid

Step-by-Step Solution

Solution:

Step 1: Understand default reverse relation naming
If no related_name is set on a ForeignKey, Django uses modelname_set as the reverse relation name, here comment_set.
Step 2: Check usage in prefetch_related and loop
Using prefetch_related('comment_set') and accessing post.comment_set.all() is correct and will work without error.
Final Answer:
Using 'comment_set' is correct; no error here -> Option A
Quick Check:
Default reverse name = modelname_set [OK]

Quick Trick: Default reverse name is modelname_set if no related_name [OK]

Common Mistakes:

MISTAKES

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What is wrong with this code snippet?