Rails agnostic database.yml

database.yml

<%
  app = "awesome_application"
  
  mysql_version = case Rails.version.first.to_i
  when 3 then 'mysql2'
  when 2 then 'mysql'
  else
    raise 'Version not supported'
  end
%>

defaults: &defaults
    adapter: <%= mysql_version %>
    encoding: utf8
    reconnect: false
    pool: 5
    username: root
    password:
    host: localhost

development:
    database: <%= app + "_dev" %>
    <<: *defaults

test:
    database: <%= app + "_test" %>
    <<: *defaults

production:
    database: <%= app + "_dev" %>
    <<: *defaults

GOTCHA: heroku db:pull (Taps) doesn't parse the ERB so if you're using this w/ Heroku you'll have to put the dev db name in normally.