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

Django - Signals

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

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

@receiver(post_save, sender=User)
def user_created(sender, instance, created, **kwargs):
    if created:
        print(f"User {instance.username} created")

AUser <username> created

BUser created

CNo output

DError: missing parameters

Step-by-Step Solution

Solution:

Step 1: Understand the signal and handler behavior
The post_save signal triggers after saving a User. The handler prints the username if the instance is newly created.
Step 2: Analyze the print statement
The print outputs "User {instance.username} created" when created is True, which happens on new instance creation.
Final Answer:
User <username> created -> Option A
Quick Check:
post_save with created=True prints username [OK]

Quick Trick: post_save with created=True means new instance [OK]

Common Mistakes:

MISTAKES

Assuming print runs on every save
Ignoring the created flag
Expecting error due to missing parameters

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

Step 1: Understand the signal and handler behavior

Step 2: Analyze the print statement

Final Answer:

Quick Check:

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