ruby – 按键分组哈希值,后跟值

[ 
  {
    :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
  end
end

keys = 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！