[Solved] Identify the error in this signal connection code:from django.db.models.signals import pre_save def handler(sender, instance, **kwargs): print("Saving instance") pre_save.connect(handler) | Django

Django - Signals

Identify the error in this signal connection code:

from django.db.models.signals import pre_save

def handler(sender, instance, **kwargs):
    print("Saving instance")

pre_save.connect(handler)

AHandler function missing required parameters

BMissing sender argument in connect call

CSignal should be post_save, not pre_save

Dconnect method called on handler instead of signal

Step-by-Step Solution

Solution:

Step 1: Check connect method usage
When connecting a signal, sender argument is often required to specify which model triggers it.
Step 2: Identify missing sender
The code calls pre_save.connect(handler) without sender, which may cause the handler to receive signals from all models unintentionally.
Final Answer:
Missing sender argument in connect call -> Option B
Quick Check:
Connect missing sender = error [OK]

Quick Trick: Always specify sender when connecting signals [OK]

Common Mistakes:

MISTAKES

Master "Signals" in Django

9 interactive learning modes - each teaches the same concept differently

More Django Quizzes

Identify the error in this signal connection code: