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

Django - Signals

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

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

@receiver(post_save, sender=Book)
def announce_book(sender, instance, created, **kwargs):
    if created:
        print(f"New book added: {instance.title}")

book = Book.objects.create(title='Django Basics')

ANew book added:

BNew book added: Django Basics

CNo output

DError: missing argument

Step-by-Step Solution

Solution:

Step 1: Understand the signal and handler
The post_save signal triggers after saving a model. The handler checks if created is True, meaning a new record.
Step 2: Analyze the code execution
Creating a new Book instance sets created=True, so the print statement runs with the title.
Final Answer:
New book added: Django Basics -> Option B
Quick Check:
post_save with created=True prints title [OK]

Quick Trick: Check 'created' flag to print on new records only [OK]

Common Mistakes:

MISTAKES

Ignoring the 'created' flag
Assuming no output on create
Confusing signal arguments

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More Django Quizzes

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

Step 1: Understand the signal and handler

Step 2: Analyze the code execution

Final Answer:

Quick Check:

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