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You wrote a test that adds a user but the test database still shows zero users. What is the most likely cause?

medium📝 Debug Q6 of 15
Flask - Testing Flask Applications
You wrote a test that adds a user but the test database still shows zero users. What is the most likely cause?
AYou forgot to call db.session.commit()
BYou used the wrong database URI
CYou did not import the User model
DYou ran the test outside the Flask app context
Step-by-Step Solution
Solution:

  1. Step 1: Check common reasons for no data saved

    Forgetting db.session.commit() is a frequent cause for no data persistence.

  2. Step 2: Evaluate other options

    Wrong URI or missing import usually cause errors, not silent zero results; running outside app context causes errors too.

  3. Final Answer:

    You forgot to call db.session.commit() -> Option A

  4. Quick Check:

    No commit = no saved data [OK]
Quick Trick: Commit session to persist data in tests [OK]
Common Mistakes:
MISTAKES
  • Ignoring commit
  • Assuming silent failures
  • Not checking app context

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