$ irb
2.2.3 :001 > require 'yaml'
 => true
2.2.3 :002 > config = YAML.load_file('config.yml')
 => {"development"=>{"adapter"=>"postgresql", "encoding"=>"unicode", "pool"=>5, "host"=>"localhost", "database"=>"customers_db_development", "username"=>"foo", "password"=>"bar"}, "test"=>{"adapter"=>"postgresql", "encoding"=>"unicode", "pool"=>5, "host"=>"localhost", "database"=>"customers_db_test", "username"=>"foo", "password"=>"bar"}, "production"=>{"adapter"=>"postgresql", "encoding"=>"unicode", "pool"=>5, "host"=>"localhost", "database"=>"customers_db_test", "username"=>"customers_db", "password"=>"adfkj3d8vjt4fjashd36"}}
2.2.3 :003 >