在Rails中搜索嵌套散列中的键 [英] search for key in a nested hash in Rails

问题描述

我在 myAuth

<$ p $对象中捕获了以下嵌套的哈希（来自Ominauth-Facebook） p> < Ominauth :: AuthHash凭证
extra =＃< Hashie :: Mash
raw_info =＃< Hashie :: Mash email =[e-mail] >>>


我想提取电子邮件，所以我使用：

  myAuth ['extra'] ['raw_info'] ['email'] 
  

但是，我想搜索整个散列并在不知道确切的散列结构的情况下获取关键字 email 的值。我应该怎么办？

谢谢。 不知道这是否是最好的解决方案，但我会这样做：

  h = {seal：5，test：3 ，回答：{nested：该死的，某事：{email：耶！ }}} 
 
 def search_hash（h，search）
 return h [search] if h.fetch（search，false）
 
 h.keys.each do | K | 
 answer = search_hash（h [k]，search）if h [k] .is_a？哈希
返回答案如果答案
结束
 $ b $ false 
结束
 
将search_hash（h，：email）
  

如果密钥存在或为false，则会返回该值。

I have the following nested hash (from Ominauth-Facebook) captured in an object called myAuth

<Ominauth::AuthHash credentials 
                     extra=#<Hashie:: Mash 
                     raw_info=#<Hashie::Mash email="[e-mail]">>>

I would like to extract email, so I use:

myAuth['extra']['raw_info']['email']

However, I would like to search the entire hash and get the value for key email without knowing exact hash structure. How should I go about it?

Thank you.

解决方案

Don't know if this is the best solution, but i would do:

h = {seal: 5, test: 3, answer: { nested: "damn", something: { email: "yay!" } } }

def search_hash(h, search)
  return h[search] if h.fetch(search, false)

  h.keys.each do |k|
    answer = search_hash(h[k], search) if h[k].is_a? Hash
    return answer if answer
  end

  false
end

puts search_hash(h, :email)

This will return the value if the key exists or false.

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