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17 lines
656 B
Markdown
17 lines
656 B
Markdown
# Migrating Up Down Up
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When writing Rails migrations, it is good to define, when possible, what
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should happen when migrating *up* and what should happen when migrating
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*down*. You'll then want to check that both the *up* and *down* work. This
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can be accomplished using the following one-liner:
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```bash
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$ rake db:migration && rake db:migration:redo
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```
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The `rake db:migration` does what we would expect applying our new migration
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and showing us that our *up* works. The `rake db:migrate:redo` first
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performs a rollback, showing us that our *down* works, and then migrates
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back up again. We now know that our latest migration works going both
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directions.
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