I'm trying to run just one migration out of a whole bunch in my rails app. How can I do this? I don't want to run any of the migrations before or after it. Thanks.
11 Answers
I use this technique in development when I change a migration a significant amount, and I don't want to migrate down a ton and lose any data in those along the way (especially when I'm importing legacy data that takes a long time that I don't want to have to re-import again).
This is 100% hackish and I would definitely not recommend doing this in production, but it will do the trick:
- Move migration that you want to re-run out of its directory to a temporary place
- Generate another migration with the same name
- Copy/paste the original migration code into the newly generated migration file
- Run the new migration
- Delete the newly generated migration file
- Edit your schema migrations to remove the most recent value
- Restore the old migration file
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