[GitHub] [airflow] bhavaniravi commented on issue #18323: Detect and fail any command when db is not migrated

[GitBox <gi...@apache.org>]

bhavaniravi commented on issue #18323:
URL: https://github.com/apache/airflow/issues/18323#issuecomment-921686654


   Yes, it's possible in the alembic. [Check this SO answer](https://stackoverflow.com/a/56085521/6340775)
   
   A similar airflow snippet would look like, used `check_migrations` as a template
   
   ```
   def compare_migrations():
       from alembic.runtime.migration import MigrationContext
       from alembic.script import ScriptDirectory
   
       config = _get_alembic_config()
       script_ = ScriptDirectory.from_config(config)
       with settings.engine.connect() as connection:
           context = MigrationContext.configure(connection)
           if context.get_current_revision() != script_.get_current_head():
               raise exceptions.DatabaseIsNotUpToDate('Upgrade the database.')
   ```
   
   Do we do this check every time we start the webserver or scheduler?


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