从哈希值准备字符串的优雅方式答案

【问题标题】：elegant way of preparing a string from hash values从哈希值准备字符串的优雅方式
【发布时间】：2020-12-08 07:20:59
【问题描述】：

下面是我的哈希

my_hash = {
  "unique_id": [
    {
      "code": "1001",
      "message": "The unique id has already been taken."
    }
  ]
}

我想根据上面的哈希值准备一个字符串。前任。 "1001-The unique id has already been taken."

到目前为止，我能够得到以下结果

my_hash.values.flatten.map {|a| a.values.join('-')}.join(',')

我想知道有没有更好的方法。

更新：my_hash 可以有多个哈希值。

{"unique_id":[{"code":"1001","message":"The unique id has already been taken."}], "user_id":[{"code":"1002","message":"The user id has already been taken."}]}

并且期望值"1001-The unique id has already been taken.,1002-The user id has already been taken."

【问题讨论】：

更新了预期的字符串@CarySwoveland
除非需要，否则通常不包含带符号的引号（例如，当一个符号由多个单词组成时：:"my dog saffi"）。 "code": "1001"、code: "1001"、:"code" => "1001" 和 :code => "1001" 都是等价的。
@CarySwoveland 即使哈希是{:unique_id=>[{:code=>"1001", :message=>"The unique id has already been taken."}], :user_id=>[{:code=>"1002", :message=>"The user id has already been taken."}]} 如何缩短我丑陋的代码？
如果同一属性有多个错误，预期的输出是什么？

标签： ruby-on-rails ruby ruby-hash

【解决方案1】：

这是一个较短的版本：

my_hash[:unique_id].first.values.join("-")

【讨论】：

我更新了我的哈希评论@Camillle。哈希可以有多个值。

【解决方案2】：

my_hash = {"unique_id":[{"code":"1001","message":"The unique id has already been taken"}],"user_id":[{"code":"1002","message":"The user id has already been taken"}]} 


my_hash.flat_map {|k,v| v.map(&:values).join '-'}.to_sentence

或

my_hash.flat_map {|k,v| v.map(&:values).join '-'}.join ','

【讨论】：

【解决方案3】：

my_hash = {"unique_id":[{"code":"1001","message":"The unique id has already been taken."}], "user_id":[{"code":"1002","message":"The user id has already been taken."}]}

my_hash.values.map{|v| v.map{|a| "#{a[:code]}-#{a[:message]}"}}.flatten.join(",")

【讨论】：