从Ruby中的嵌套哈希返回单个:key [英] Return single :key from nested hash in ruby

问题描述

从LayerVault的psd.rb gem中，我得到一个哈希，其中包含嵌套哈希中psd的所有层和组.此处是哈希表的要点.我想从该哈希中检索某个键.有没有一种方法可以将这些键值存储在数组中?

From psd.rb gem by LayerVault, I get a hash that contains all the layers and groups of the psd in nested hashes. Here is a gist of the hash. I want to retrieve a certain key from that hash. Is there a way to do this and store those keys values in an array?

推荐答案

def values(hsh, key)
  return [] if !hsh.kind_of? Hash
  v = hsh[key] ? [hsh[key]] : []
  hsh.values.select{|i| i.kind_of? Hash or i.kind_of? Array}.each do |val|
    if val.kind_of? Hash
      v+= values(val, key)
    else
      val.each {|i| v+= values(i, key)}
    end
  end
  return v
end

puts values(h, :blending_mode).inspect # h is the Hash from your gist
# => ["normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal", "normal"]

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