ruby yaml 表示数组

Posted by wxianfeng Tue, 01 Mar 2011 00:24:00 GMT

yaml 的语法真是变态 , 表示个数组这么麻烦, 更复杂的数据结构 那不是更麻烦 !!!

yaml 文件:

# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html

one:
  name: MyString
  orgunit_id: 1
  inheritable: false
 # codes 是yaml数组表示方法
 # 缩进只能是两个空格为一级，不能是其他字符
  codes: 
    - 1
    - a
    - 2
    - b
    - 3
    - c

ruby 解析yaml:

ruby-1.9.2-p0 >   file =  "#{Rails.root}/test/fixtures/enumerations.yml"
 => "/usr/local/system/projects/entos/ent_os/test/fixtures/enumerations.yml" 
ruby-1.9.2-p0 > YAML.load File.read(file) 
 => {"one"=>{"name"=>"MyString", "orgunit_id"=>1, "inheritable"=>false, "codes"=>[1, "a", 2, "b", 3, "c"]}}

不知道怎么写的可以 使用 to_yaml 方法 看一下:

irb(main):001:0> 
=> {"one"=>{"name"=>"MyString", "inheritable"=>false, "orgunit_id"=>1, "codes"=>[1, "a", 2, "b", 3, "c"]}}
irb(main):002:0> require "yaml"
=> true
irb(main):003:0> hsh.to_yaml
=> "--- \none: \n  name: MyString\n  inheritable: false\n  orgunit_id: 1\n  codes: \n  - 1\n  - a\n  - 2\n  - b\n  - 3\n  - c\n"

可读性 更好的 使用 y 方法

ruby-1.9.2-p0 > y hsh
--- 
one: 
  name: MyString
  orgunit_id: 1
  inheritable: false
  codes: 
  - 1
  - a
  - 2
  - b
  - 3
  - c
 => nil

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