Little sh script to enable git config for branch-specific databases with Rails.

database.yml

<%
  # http://mislav.uniqpath.com/rails/branching-the-database-along-with-your-code/
  branch = `git symbolic-ref HEAD 2>/dev/null`.chomp.sub('refs/heads/', '')
  suffix = `git config --bool branch.#{branch}.database`.chomp == 'true' ? "_#{branch}" : ""
%>

common: &common
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  # xxx

development:
  <<: *common
  database: app_dev<%= suffix %>
  
test:
  <<: *common
  database: app_test<%= suffix %>

enable-branch.sh

#!/usr/bin/env bash

# change branch first then run this to quickly enable branch-specific database

git config --bool branch.$(ruby -e 'puts `git symbolic-ref HEAD 2>/dev/null`.split("/").last.chomp').database true