Different DBs depending on git branch

database.yml

<%
  # Adds the current GIT repo to the database name.
  parts = [ `git symbolic-ref HEAD 2>/dev/null`.chomp.sub('refs/heads/', ''), ENV['TEST_ENV'] ].compact
  suffix = parts.length == 0 ? "" : "_#{parts.join("_")}"
%>

development:  
  adapter: postgresql
  encoding: unicode
  pool: 5
  username: username
  password: password
  database: myapp_development<%= suffix %>

test: &test
  adapter: postgresql
  encoding: unicode
  pool: 5
  username: username
  password: password
  database: myapp_test<%= suffix %>