ruby – 按键分组哈希值,后跟值

概述假设我有以下数据集 [ { :name => "sam", :animal => "dog", :gender => "male" }, { :name => "max", :animal => "cat", :gender => "female" }, { :name => "joe", :animal => "sna 假设我有以下数据集

[   {    :name => "sam",:animal => "dog",:gender => "male"  },{    :name => "max",:animal => "cat",:gender => "female"  },{    :name => "joe",:animal => "snake",:gender => "male"  }    ]

你如何将哈希数组分组为：

{  :name => ["sam","max","joe"]  :animal => ["dog","cat","snake"]  :gender => ["male","female","male"]}

我读过类似的文章,如this和Group array of hashes by key

但是,大多数示例将值返回为增量计数,其中我正在寻找实际的单独值.

我的尝试

keys = []values = []arr.each do |a|  a.each do |k,v|    keys << k    #this is where it goes wrong and where I'm stuck at    values << v  endendkeys = keys.uniq

我明白我出错的地方是我如何分割价值观.任何方向将不胜感激！

解决方法

input.reduce { |e,acc| acc.merge(e) { |_,e1,e2| [*e2,*e1] } }#⇒ {:name=>["sam","joe"],#   :animal=>["dog","snake"],#   :gender=>["male","male"]}

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