caboose

My independent migrations patch has been sitting on the rails trac for 4 months, so I’m releasing it as a plugin.

Code plz thx

ticket: http://dev.rubyonrails.org/ticket/6799
plugin: svn://caboo.se/plugins/court3nay/independent_migrations

I plan to add a generator, one day, if anyone cares.

wtf

In simple terms, here’s what it does. To paraphrase zenspider, if two migrations have the same number, Rails will bitch at you. This plugin removes the bitching. To get it working, install, then edit your migrations so they look like this

class AddProject < ActiveRecord::IndependentMigration

That’s it. Now your migration directory can look something like

002_add_project.rb
002.add_monkeys.rb
003.fix_monkeys.rb

and as long as all 002 are independent, then the migration will run. This patch is only guaranteed for Rails 1.2.3 and may change as ActiveRecord changes as it relies heavily on monkeypatching (or reopening classes, as David Black would have you believe) some private methods.

Why?

If you’re still wondering, “Why?”, the usage came from heavy usage of branches. Basically, if there are two branches being developed in parallel, and both are getting migrations, it can be assumed that those migrations are, in fact, in parallel, and won’t conflict, so can have the same number.

Alternate solutions

There is of course more ways to skin a cat, and the other contender for your migrations is Françoise Beausoleil’s “Timestamped Migrations”, while it isn’t a plugin (yet), numbers your migrations like it says on the box (with timestamps).

http://blog.teksol.info/articles/search?q=migration