ruby - 如何从散列的散列中删除重复值

Question

我需要一个唯一的散列，其中 "one" 的值永远不会重复。

例如，

hash= {"1"=>{"one"=>1,"two"=>2},
   "2"=>{"one"=>1,"two"=>3},
   "3"=>{"one"=>2,"two"=>3},
   "4"=>{"one"=>1,"two"=>2}}

那么结果应该是，

hash= {"1"=>{"one"=>1,"two"=>2},
    "3"=>{"one"=>2,"two"=>3}}

Answer 1

(可读)一行:

hash.to_a.uniq {|(_,v)| v['one']}.to_h
# {"1"=>{"one"=>1, "two"=>2}, "3"=>{"one"=>2, "two"=>3}}