Flask - Deployment
To safely add a new column to an existing table in a deployed Flask app's database, which sequence of commands should you run?
To safely add a new column to an existing table in a deployed Flask app's database, which sequence of commands should you run?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Modify the model
Add the new column to your SQLAlchemy model in the Flask app code.Step 2: Generate migration script
Runflask db migrateto create a migration script reflecting the model changes.Step 3: Apply migration
Runflask db upgradeto apply the migration and update the database schema safely.Final Answer:
Modify model -> flask db migrate -> flask db upgrade -> Option AQuick Check:
Always migrate after model changes, then upgrade [OK]
Quick Trick: Modify model first, then migrate, then upgrade [OK]
Common Mistakes:
MISTAKES- Running upgrade before migrate
- Migrating before modifying models
- Skipping migration generation
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