ruby - 在带有 Ruby 的 YAML 中使用别名

Question

我有以下 YAML:

- PRO_PLAN:
  - description: This is the Pro plan
    publicName: Pro Plan
    startDate: 12-20-2015

  - PRO_MONTHLY_DIRECT:
    - publicName: Pro Monthly 
      price: 20
      sub_target: zone

    - PRICING_COMPONENTS: &pro_entitlements
      analytics_range: 21600
      rules: 10
      cannon: true


  - PRO_ANNUAL_DIRECT:
    - publicName: Pro Annual  
      price: 240
      sub_target: zone

    - PRICING_COMPONENTS:
      <<: *pro_entitlements

结果数组没有为第二个节点引入 pro_entitlements:

[8] pry(BF)> app_hash[0]['PRO_PLAN'][1]
=> {"PRO_MONTHLY_DIRECT"=>[{"publicName"=>"Pro Monthly", "price"=>20, "sub_target"=>"zone"}, {"PRICING_COMPONENTS"=>nil, "analytics_range"=>21600, "page_rules"=>10, "polish"=>true}]}
[9] pry(BF)> app_hash[0]['PRO_PLAN'][2]
=> {"PRO_ANNUAL_DIRECT"=>[{"publicName"=>"Pro Annual", "price"=>240, "sub_target"=>"zone"}, {"PRICING_COMPONENTS"=>nil, "<<"=>nil}]}

Answer 1

当我需要构建更复杂的 YAML 文档时，我通常从使用 Ruby 和 Ruby 的 Hash 和 Array 对象开始。 YAML 序列化程序知道如何构建别名和 anchor ，如果我们允许，它会这样做:

require 'yaml'

foo = {'foo' => 1}
bar = {'bar' => 2, 'foo' => foo}
baz = {'baz' => 3, 'foo' => foo}

puts [foo, bar, baz].to_yaml

# >> ---
# >> - &1
# >>   foo: 1
# >> - bar: 2
# >>   foo: *1
# >> - baz: 3
# >>   foo: *1

这里它为 foo 数组创建一个别名，然后在序列化哈希数组时引用它。

对 YAML 使用相同的想法:

require 'yaml'

PRO_ENTITLEMENTS = {
  'analytics_range' => 21600,
  'rules'           => 10,
  'cannon'          => true
}

doc = [
  {
    'PRO_PLAN' => 
    [
      {
        'description' => 'This is the Pro plan',
        'publicName'  => 'Pro Plan',
        'startDate'   => '12-20-2015'
      },
      {
        'PRO_MONTHLY_DIRECT' => 
        [
          {
            'publicName' => 'Pro Monthly',
            'price'      => 20,
            'sub_target' => 'zone'
          },
          {
            'PRICING_COMPONENTS' => PRO_ENTITLEMENTS,
            'analytics_range'    => 21600,
            'rules'              => 10,
            'cannon'             => true
          }
        ]
      },
      {
        'PRO_ANNUAL_DIRECT' => 
        [
          {
            'publicName' => 'Pro Annual',
            'price'      => 240,
            'sub_target' => 'zone'
          },
          {
            'PRICING_COMPONENTS' => PRO_ENTITLEMENTS,
          }
        ]
      }
    ]
  }
]

puts doc.to_yaml

运行它返回:

---
- PRO_PLAN:
  - description: This is the Pro plan
    publicName: Pro Plan
    startDate: 12-20-2015
  - PRO_MONTHLY_DIRECT:
    - publicName: Pro Monthly
      price: 20
      sub_target: zone
    - PRICING_COMPONENTS: &1
        analytics_range: 21600
        rules: 10
        cannon: true
      analytics_range: 21600
      rules: 10
      cannon: true
  - PRO_ANNUAL_DIRECT:
    - publicName: Pro Annual
      price: 240
      sub_target: zone
    - PRICING_COMPONENTS: *1

这不能保证是您使用的正确输出，只是一个示例，说明如何在 Ruby 中构建结构并让 YAML 输出它，以便您可以看到它在序列化后应该是什么样子。

我们可以运行一个往返测试:

YAML.load(doc.to_yaml)
# => [{"PRO_PLAN"=>
#       [{"description"=>"This is the Pro plan",
#         "publicName"=>"Pro Plan",
#         "startDate"=>"12-20-2015"},
#        {"PRO_MONTHLY_DIRECT"=>
#          [{"publicName"=>"Pro Monthly", "price"=>20, "sub_target"=>"zone"},
#           {"PRICING_COMPONENTS"=>
#             {"analytics_range"=>21600, "rules"=>10, "cannon"=>true},
#            "analytics_range"=>21600,
#            "rules"=>10,
#            "cannon"=>true}]},
#        {"PRO_ANNUAL_DIRECT"=>
#          [{"publicName"=>"Pro Annual", "price"=>240, "sub_target"=>"zone"},
#           {"PRICING_COMPONENTS"=>
#             {"analytics_range"=>21600, "rules"=>10, "cannon"=>true}}]}]}]