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Question

我在Ruby on Rails项目中有以下yml文件表示本地化文件：

es:
  animals:
    happy_animals:
      dog: Dog
      cat: Cat
      horse: Horse
    sad_animals:
      cow: Cow
      elephant: Elephant

我需要在与动物相同的级别添加另一个类别以获得以下结果：

es:
  animals:
    happy_animals:
      dog: Dog
      cat: Cat
      horse: Horse
    sad_animals:
      cow: Cow
      elephant: Elephant
  farm_animals:  # This key is new
    happy_animals:
      dog: Dog
      cat: Cat
      horse: Horse
    sad_animals:
      cow: Cow
      elephant: Sick elephant #This value changed

我想知道是否有办法复制结构，覆盖某些特定的值或节点。我尝试过以下方法：

es:
  animals: &animals
    happy_animals:
      dog: Dog
      cat: Cat
      horse: Horse
    sad_animals:
      cow: Cow
      elephant: Elephant
  farm_animals:  
    <<: *animals
    sad_animals:
      elephant: Sick Elephant

但是，这段代码会覆盖树的整个sad_animals分支，而我只想覆盖一个特定的值，保留树的其余部分。这是否可以与yaml一起使用？

Answer 1

这应该可以解决问题：

es:
  animals: &animals
    happy_animals:
      dog: Dog
      cat: Cat
      horse: Horse
    sad_animals: &sad_animals
      cow: Cow
      elephant: Elephant
  farm_animals:  
    <<: *animals
    sad_animals:
      <<: *sad_animals
      elephant: Sick Elephant

2.3.0 :001 > yaml = <<-YALM
2.3.0 :002">     es:
2.3.0 :003">       animals: &animals
2.3.0 :004">         happy_animals:
2.3.0 :005">           dog: Dog
2.3.0 :006">           cat: Cat
2.3.0 :007">           horse: Horse
2.3.0 :008">         sad_animals: &sad_animals
2.3.0 :009">           cow: Cow
2.3.0 :010">           elephant: Elephant
2.3.0 :011">       farm_animals:  
2.3.0 :012">         <<: *animals
2.3.0 :013">         sad_animals:
2.3.0 :014">           <<: *sad_animals
2.3.0 :015">           elephant: Sick Elephant
2.3.0 :016"> YALM
2.3.0 :017"> Psych.load yaml
 => {"es"=>{"animals"=>{"happy_animals"=>{"dog"=>"Dog", "cat"=>"Cat", "horse"=>"Horse"}, "sad_animals"=>{"cow"=>"Cow", "elephant"=>"Elephant"}}, "farm_animals"=>{"happy_animals"=>{"dog"=>"Dog", "cat"=>"Cat", "horse"=>"Horse"}, "sad_animals"=>{"cow"=>"Cow", "elephant"=>"Sick Elephant"}}}} 

如您所见，sad_animals有一个Sick Elephant：

"sad_animals"=>{"cow"=>"Cow", "elephant"=>"Sick Elephant"}