Read database config from database.yml in a padrino app

database.rb

# On Heroku we'll read the config from ENV
if postgres = URI.parse(ENV['DATABASE_URL'] || '')
  ActiveRecord::Base.configurations[:production] = {
    :adapter  => 'postgresql',
    :encoding => 'utf8',
    :database => postgres.path[1..-1], 
    :username => postgres.user,
    :password => postgres.password,
    :host     => postgres.host
  }
else
  YAML.load_file("#{Padrino.root}/config/database.yml").each do |env, conf|
    ActiveRecord::Base.configurations[env.to_sym] = conf.symbolize_keys
  end
end