[Solved] What is wrong with this signal usage?from django.db.models.signals import post_save post_save.connect(handle_save) def handle_save(sender, instance, **kwargs): print('Saved!') | Django

Django - Signals

What is wrong with this signal usage?

from django.db.models.signals import post_save

post_save.connect(handle_save)

def handle_save(sender, instance, **kwargs):
    print('Saved!')

Apost_save signal cannot be connected manually

BMissing sender argument in connect call

CSignal handlers must return a value

DThe signal handler is connected before it is defined

Step-by-Step Solution

Solution:

Step 1: Check order of function definition and connection
The handler function handle_save is connected before it is defined, causing a NameError.
Step 2: Understand Python execution order
Python reads top to bottom, so handle_save must be defined before connecting it.
Final Answer:
The signal handler is connected before it is defined -> Option D
Quick Check:
Define handler before connecting signal [OK]

Quick Trick: Define handler before connecting signals [OK]

Common Mistakes:

MISTAKES

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What is wrong with this signal usage?