[Solved] Given this code snippet, what will be printed when a Book instance is saved? from django.db.models.... Given this code snippet, what will be printed when a Book instance is saved? | Django

Django - Signals

Given this code snippet, what will be printed when a Book instance is saved?

from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=Book)
def notify(sender, instance, **kwargs):
    print(f"Book saved: {instance.title}")

book = Book(title='Django Basics')
book.save()

ABook saved: None

BError: receiver not connected

CNo output printed

DBook saved: Django Basics

Step-by-Step Solution

Solution:

Step 1: Understand the signal connection
The @receiver decorator connects notify to post_save for Book.
Step 2: What happens on book.save()?
Saving the book triggers post_save, calling notify, which prints the book's title.
Final Answer:
Book saved: Django Basics -> Option D
Quick Check:
post_save triggers print with instance title = B [OK]

Quick Trick: post_save calls receiver printing instance data [OK]

Common Mistakes:

MISTAKES

Assuming no output without explicit call
Confusing instance attribute access
Thinking receiver needs manual call

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More Django Quizzes

Given this code snippet, what will be printed when a Book instance is saved?

Step 1: Understand the signal connection

Step 2: What happens on `book.save()`?

Final Answer:

Quick Check:

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