database.yml

<% 
  git_branches = `cd "#{RAILS_ROOT}"; /opt/local/bin/git branch --no-color`
  git_branch = git_branches.split("\n").detect { |b| b =~ /\A\*/ }.gsub(/\A\* /, '')
%>

common: &common
  adapter: sqlite3
  timeout: 5000

development:
  <<: *common
  database: db/development<%= git_branch ? "_#{git_branch}" : '' %>.sqlite3

test:
  <<: *common
  database: db/test<%= git_branch ? "_#{git_branch}" : '' %>.sqlite3

production:
  <<: *common
  database: db/development<%= git_branch ? "_#{git_branch}" : '' %>.sqlite3