Django - Signals
How do you properly register a
pre_save signal handler for a Django model called Book using the @receiver decorator?How do you properly register a pre_save signal handler for a Django model called Book using the @receiver decorator?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the decorator usage
The@receiverdecorator takes the signal and sender as arguments.Step 2: Match signal and sender
Forpre_saveonBook, use@receiver(pre_save, sender=Book).Step 3: Eliminate incorrect options
Callpre_save.connect(handler, sender=Book)inside the model class is a method call, not decorator usage; C is invalid syntax; D uses the wrong signal.Final Answer:
Use@receiver(pre_save, sender=Book)above the handler function -> Option AQuick Check:
Decorator syntax requires signal and sender [OK]
Quick Trick: Use @receiver(signal, sender=Model) decorator [OK]
Common Mistakes:
MISTAKES- Using post_save instead of pre_save
- Calling connect inside model class incorrectly
- Assigning handler directly to model attribute
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