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

Django - Signals

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

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

@receiver(pre_save, sender=Article)
def before_save(sender, instance, **kwargs):
    print('Saving:', instance.title)

article = Article(title='Hello')
article.save()

ASaving: None

BNo output

CError: receiver not connected

DSaving: Hello

Step-by-Step Solution

Solution:

Step 1: Understand the receiver decorator
The @receiver(pre_save, sender=Article) connects the before_save function to the pre_save signal for Article.
Step 2: Check what happens on save
When article.save() runs, before_save prints the title 'Hello'.
Final Answer:
Saving: Hello -> Option D
Quick Check:
pre_save signal prints title before save [OK]

Quick Trick: pre_save runs before save, prints instance data [OK]

Common Mistakes:

MISTAKES

Assuming no output without explicit connect call
Thinking print shows None if instance has title
Confusing pre_save with post_save output timing

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More Django Quizzes

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

Step 1: Understand the receiver decorator

Step 2: Check what happens on save

Final Answer:

Quick Check:

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