Building Data-Driven Web Apps with Flask and SQLAlchemy Transcripts
Chapter: Course conclusion
Lecture: Database migrations
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ORMs are great, SQLAlchemy is great
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except for once you're in production
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if the database doesn't exactly match
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what your SQLAlchemy classes think they should be
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remember, it will crash.
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Operational error, or some column doesn't exist
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something like that.
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So how do we solve that?
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Manually syncing the database for every change we did?
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No. We set up Alembic.
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And we told Alembic to automatically look at our classes
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and remap our database schema
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with migrations to make that happen.
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So there's a couple manual steps you got to do here
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but once you get it set up
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it's pretty easy, you just run a command
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apply that change by saying alembic upgrade head.
