Configuration 如何从Yaml配置文件的初始化脚本调用变量

我正在尝试运行一个初始化脚本来帮助我从config.yml文件中检索数据

config.yml当前看起来如下所示：

production: &default
  log_server: log_server
  deploy_to: /path/to/deploy
  unicorn:
    port: 8080
    uid: user 
    gid: group
 development: &dev
  <<: *default
  deploy_to:path/to/deploy
  unicorn:
    port: 80
    uid: unicorn 
    gid: unicorngroup

{"production"=>{"log_server"=>"log_server", "deploy_to"=>"path/to/deploy",  "unicorn"=>{"port"=>8080, "uid"=>"user", "gid"=>"group"}}, "development"=>{"log_server"=>"log_server", "deploy_to"=>"path/to/deploy", "unicorn"=>{"port"=>80, "uid"=>"unicorn", "gid"=>"unicorn group"}}

如果我“放置配置”，则输出如下所示：

production: &default
  log_server: log_server
  deploy_to: /path/to/deploy
  unicorn:
    port: 8080
    uid: user 
    gid: group
 development: &dev
  <<: *default
  deploy_to:path/to/deploy
  unicorn:
    port: 80
    uid: unicorn 
    gid: unicorngroup

{"production"=>{"log_server"=>"log_server", "deploy_to"=>"path/to/deploy",  "unicorn"=>{"port"=>8080, "uid"=>"user", "gid"=>"group"}}, "development"=>{"log_server"=>"log_server", "deploy_to"=>"path/to/deploy", "unicorn"=>{"port"=>80, "uid"=>"unicorn", "gid"=>"unicorn group"}}

如果我只想从prod或development中获取某些变量，那么我将如何调用这些变量呢？我的目标是能够根据我使用的环境调用任何变量