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Which of these is the best way to define and send this signal?

hard📝 Application Q15 of 15
Django - Signals
You want to create a custom signal that notifies when a user profile is updated, sending the user instance and a flag if the update was major. Which of these is the best way to define and send this signal?
ADefine signal with no providing_args and send with user=user_obj, major_update=True
BDefine signal with providing_args=['user'] and send with user=user_obj, major_update=True
CDefine signal with providing_args=['user', 'major_update'] and send with user=user_obj, major_update=True
DDefine signal with providing_args=['user', 'major_update'] but send only user=user_obj
Step-by-Step Solution
Solution:
  1. Step 1: Define signal with all expected arguments

    Since you want to send both user and major_update, both must be listed in providing_args.
  2. Step 2: Send signal with matching arguments

    When sending, include both user and major_update to match the signal definition and receiver expectations.
  3. Final Answer:

    Define signal with providing_args=['user', 'major_update'] and send with user=user_obj, major_update=True -> Option C
  4. Quick Check:

    Signal args must match send args [OK]
Quick Trick: Match providing_args and send arguments exactly [OK]
Common Mistakes:
MISTAKES
  • Omitting arguments in providing_args
  • Sending arguments not declared in providing_args
  • Defining signal without providing_args but sending args

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