如何將YAML文件中的字段解析爲同一文件中的三個字段？

Question

我有一個包含YAML文件：

cat: 
    name: Cat 
    description: catlike reflexes 
dog: 
    name: Dog 
    description: doggy breath 

我要分析它，並打破了描述成key1和key2像這樣：

cat: 
    name: Cat 
    description: catlike reflexes 
    info: 
    key1: catlike 
    key2: reflexes 
dog: 
    name: Dog 
    description: doggy breath 
    info: 
    key1: doggy 
    key2: breath 

但是，出於某種原因，我不能這樣做正確。我已經試過到目前爲止是下面的代碼的變化，我覺得我過於複雜：

# to get the original file's data 
some_data = YAML.load(File.open("#{Rails.root}/config/some_data.yml")) 

new_data = some_data.collect do |old_animal| 
    animal = old_animal.second 

    if animal && animal["description"] 
    new_blocks = Hash.new 
    blocks = animal["description"].split(" ") 
    new_blocks["key1"] = blocks.first 
    new_blocks["key2"] = blocks.second 
    animal["info"] = new_blocks 
    end 
    old_animal.second = animal 
    old_animal 
end 

# to write over the original file 
File.write("#{Rails.root}/config/some_data.yml", new_data.to_yaml) 

Answer 1

你不說你是否可以在描述多個字，但它是一種所以我會這樣做：

require 'yaml' 

data = YAML.load(<<EOT) 
cat: 
    name: Cat 
    description: catlike reflexes rules 
dog: 
    name: Dog 
    description: doggy breath 
EOT 
data # => {"cat"=>{"name"=>"Cat", "description"=>"catlike reflexes rules"}, "dog"=>{"name"=>"Dog", "description"=>"doggy breath"}} 

此時，來自YAML文件的數據被加載到散列中。遍歷每個哈希鍵/值對：

data.each do |(k, v)| 
    descriptions = v['description'].split 
    keys = descriptions.each_with_object([]) { |o, m| m << "key#{(m.size + 1)}" } 
    hash = keys.each_with_object({}) { |o, m| m[o] = descriptions.shift } 
    data[k]['info'] = hash 
end 

這就是我們回來：

data # => {"cat"=>{"name"=>"Cat", "description"=>"catlike reflexes rules", "info"=>{"key1"=>"catlike", "key2"=>"reflexes", "key3"=>"rules"}}, "dog"=>{"name"=>"Dog", "description"=>"doggy breath", "info"=>{"key1"=>"doggy", "key2"=>"breath"}}} 

它什麼樣子，如果它是輸出：

puts data.to_yaml 
# >> --- 
# >> cat: 
# >> name: Cat 
# >> description: catlike reflexes rules 
# >> info: 
# >>  key1: catlike 
# >>  key2: reflexes 
# >>  key3: rules 
# >> dog: 
# >> name: Dog 
# >> description: doggy breath 
# >> info: 
# >>  key1: doggy 
# >>  key2: breath 

each_with_object與inject類似，但使用起來更簡潔一些，因爲它不要求我們返回正在積累的對象。