如何找到包含匹配值的哈希键

问题描述：

鉴于我有以下 clients 哈希，是否有一种快速的 ruby 方式(无需编写多行脚本)来获取给定我想要匹配 client_id 的密钥?例如.如何获取client_id == "2180"的密钥?

Given I have the below clients hash, is there a quick ruby way (without having to write a multi-line script) to obtain the key given I want to match the client_id? E.g. How to get the key for client_id == "2180"?

clients = {
  "yellow"=>{"client_id"=>"2178"}, 
  "orange"=>{"client_id"=>"2180"}, 
  "red"=>{"client_id"=>"2179"}, 
  "blue"=>{"client_id"=>"2181"}
}

答

你可以使用 Enumerable#select:

clients.select{|key, hash| hash["client_id"] == "2180" }
#=> [["orange", {"client_id"=>"2180"}]]

请注意，结果将是所有匹配值的数组，其中每个值都是键和值的数组.

Note that the result will be an array of all the matching values, where each is an array of the key and value.

如何找到包含匹配值的哈希键

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