Migration Concordance

If you are a solo developer, Rails' migrations are the neatest thing since sliced bread. If you work on a team, you know that often it can be a real pain dealing with migrations. Someone on your team checks in a new migration and you don't notice it when you svn up or git pull, and suddenly all your tests are breaking. Or even worse, someone modifies an old migration and you need to reset and migrate up from zero (we're talking development here, not production). I'm not a fan of automatically running migrations (I'll leave the reasons for you to guess), but I do like to be informed of when I'm about to run headfirst into a wall. Saves so much wear and tear on my noggin.

And so I give you the migration_concordance plugin. It's pretty darn simple. From the README:

This plugin extends Rails migrations to provide notification when you need to run migrations. It will detect both new migrations and modifications to previously run migrations. It is primarily of use for team development, but is also useful when deploying a release to a new environment to determine when migrations need to be run. This plugin does not run migrations automatically, but will notify you whenever you need to run them.