YAML 具有继承性。我见过的最清晰的例子在这里：http://blog.101ideas.cz/posts/dry-your-yaml-files.html https://web.archive.org/web/20130213112648/http://blog.101ideas.cz/posts/dry-your-yaml-files.html

我需要更复杂的东西：我需要覆盖对象的对象的属性。这是一个例子：

database: &default
  server:
    ip: 192.168.1.5
    port: 2000
  db_name: test
  user: 
    name: root
    password: root

# database foo differs from default by only its port and user password
foo_database:
  <<: *default
  server:
    port: 2001
  db_name: foo
  user:
    password: foo_root

我想得到这个结果：

foo_database.server.ip -> 192.168.1.5
foo_database.server.port -> 2001
foo_database.db_name -> foo
foo_database.user.name -> root
foo_database.user.password -> foo_root

但如果你这样声明，你会得到这些不正确的属性（根据预期值）：

foo_database.server.ip -> will be None
foo_database.user.name -> will be None

因为新的“服务器”对象只有“端口”属性，并且它会覆盖整个旧的“服务器”对象。

我如何获得我想要实现的继承？

Edit

Here is https://gist.github.com/ceremcem/4ca8d774e660c579682839620d8c2da8我的确切意图是工作代码实时脚本 http://livescript.net/:

config = 
  default: 
    ip: \192.168.1.5
    port: 2000
    name: \root 
    password: \root 
    db:
      name: \default
      location: \LA

  foo-database:~ -> @default `merge` do 
    ip: \11.11.11.11
    db:
      name: \my-foo 

  bar-database:~ -> @foo-database `merge` do 
    password: \1234 
    db:
      location: \SF

config.default 
# => {"ip":"192.168.1.5","port":2000,"name":"root","password":"root","db":{"name":"default","location":"LA"}}
config.foo-database  
# => {"ip":"11.11.11.11","port":2000,"name":"root","password":"root","db":{"name":"my-foo","location":"LA"}}
config.bar-database  
# => {"ip":"11.11.11.11","port":2000,"name":"root","password":"1234","db":{"name":"my-foo","location":"SF"}}

不幸的是，你无法获得你想要实现的那种“继承”，因为 YAML 的“继承”更像是“合并哈希”的一种形式。

在使用时扩展您的配置*default别名，你有：

foo_database:
  server:
    ip: 192.168.1.5
    port: 2000
  db_name: test
  user: 
    name: root
    password: root

如果您之后使用具有相同键的哈希值，它们将完全覆盖之前声明的哈希值，留给您（请原谅格式）：

foo_database:

  server:
    ip: 192.168.1.5
    port: 2000
  db_name: test
  user: 
   name: root
   password: root