Deeby¶ ↑

• github.com/jbarnette/deeby

Tasks to switch your Rails database configuration for a single Rake run. Useful when you’re targeting more than one database engine.

I use this for Rails, but it should work in any framework that uses a config/database.yml file.

Create a database.[DB].yml file for each extra DB setup you might want to use. For example:

$ ls config/database.*.yml
config/database.pg.yml
config/database.sqlite.yml

These files look remarkably similar to database.yml, they’re just written for a different DB engine. Deeby looks for files that match this pattern and generates prefix Rake tasks for each alternative DB file you’ve created.

For the example above, Deeby will generate tasks called db:pg and db:sqlite. These tasks swap out database.yml for the scope of the Rake run and restore it when you’re finished.

Let’s say you develop on MySQL by default, but you’re also deploying (or transitioning) to Postgres. Once you’ve written database.pg.yml, here’s how it works out:

# runs the tests against your normal setup (MySQL)
$ rake test

# runs the tests against your Postgres setup
$ rake db:pg test

…and things are back to normal afterward. Don’t forget to run db:create and db:reset (or whatever) with the prefix task when you’re setting things up initially:

# new Postgres setup
$ rake db:pg db:create db:reset

$ gem install deeby

# in your Rakefile
require "deeby"

Copyright 2009 John Barnette (jbarnette@rubyforge.org)

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