arrays - 如何将带有“数组”键的 ruby​​ 哈希转换为 Ruby 中的嵌套哈希？

Question

我试图弄清楚如何转换这样的复杂哈希：

{
  ["A", "B"]=>{"id"=>123,"name"=>"test"},
  ["A", "F"]=>{"id"=>236,"name"=>"another test"},
  ["C", "F"]=>{"id"=>238,"name"=>"anoother test"}
}

变成一个更复杂的哈希，比如

{
  "A"=>{
     "B"=>{"id"=>123,"name"=>"test"},
     "F"=>{"id"=>236,"name"=>"another test"}
  },
  "C"=>{
     "F"=>{"id"=>238,"name"=>"anoother test"}
  }
}

任何帮助都会非常受欢迎！

标签： arraysrubyhashkey

Answer 1

each_with_object可能是救援：

hash.each_with_object(Hash.new {|h, k| h[k] = {}}) do |((first, last), v), memo|  
  memo[first].merge!(last => v)
end
#=> {"A"=>{"B"=>{"id"=>123, "name"=>"test"}, 
#          "F"=>{"id"=>236, "name"=>"another test"}}, 
#    "C"=>{"F"=>{"id"=>238, "name"=>"anoother test"}}}