[Solved] Given this code snippet, what will happen when a new User instance is saved?from django.db.models.signals import post_save from django.... | Django

Django - Signals

Given this code snippet, what will happen when a new User instance is saved?

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

@receiver(post_save, sender=User)
def welcome_email(sender, instance, created, **kwargs):
    if created:
        print(f"Welcome email sent to {instance.email}")

APrints the message every time any user is saved, new or existing

BRaises an error because the signal is not connected properly

CPrints 'Welcome email sent to' with the user's email only when a new user is created

DDoes nothing because the function is not called explicitly

Step-by-Step Solution

Solution:

Step 1: Understand the @receiver decorator usage
The decorator connects the welcome_email function to the post_save signal for the User model.
Step 2: Analyze the function behavior on save
The function checks if the instance is newly created (created == True) and prints the welcome message only then.
Final Answer:
Prints 'Welcome email sent to' with the user's email only when a new user is created -> Option C
Quick Check:
post_save with created=True triggers welcome message [OK]

Quick Trick: @receiver decorates to auto-connect signals [OK]

Common Mistakes:

MISTAKES

Thinking message prints on every save
Assuming explicit connect call is needed
Believing function won't run without manual call

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More Django Quizzes

Given this code snippet, what will happen when a new User instance is saved?

Step 1: Understand the @receiver decorator usage

Step 2: Analyze the function behavior on save

Final Answer:

Quick Check:

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