Arrays 将嵌套哈希转换为单个哈希

我想将此示例数据转换为：

{"2018-05-16"=>{
  "ABCD"=>{929119=>0.14174555, 338296=>0.13858019, 332058=>0.13680765, 449614=>0.13679536}}}

在这个散列数组中：

[
  {"target_date"=>"2018-05-16", "location"=>"ABCD", "id"=>929119, "value"=>0.14174555},
  {"target_date"=>"2018-05-16", "location"=>"ABCD", "id"=>338296, "value"=>0.13858019},
  {"target_date"=>"2018-05-16", "location"=>"ABCD", "id"=>332058, "value"=>0.13680765},
  {"target_date"=>"2018-05-16", "location"=>"ABCD", "id"=>449614, "value"=>0.13679536}
]

另一种方法——可以概括——如下

对于此散列，将返回以下数组

[{"target_date"=>"2018-05-16", "location"=>"ABCD", "id"=>92, "value"=>0.14},
 {"target_date"=>"2018-05-16", "location"=>"ABCD", "id"=>44, "value"=>0.13},
 {"target_date"=>"2018-05-16", "location"=>"EFGH", "id"=>12, "value"=>0.24},
 {"target_date"=>"2018-05-16", "location"=>"EFGH", "id"=>34, "value"=>0.23},
 {"target_date"=>"2018-05-17", "location"=>"ABCD", "id"=>52, "value"=>0.34},
 {"target_date"=>"2018-05-17", "location"=>"ABCD", "id"=>34, "value"=>0.33},
 {"target_date"=>"2018-05-17", "location"=>"EFGH", "id"=>42, "value"=>0.44},
 {"target_date"=>"2018-05-17", "location"=>"EFGH", "id"=>74, "value"=>0.43}]

---

你的问题是什么？这个问题是隐含的，我想对于这个论坛的聪明人来说，不需要明确。如果没有，那么我如何实现上述目标？sawa的意思是：“您为解决此问题而编写的代码的具体问题是什么？”。现在看来，您希望我们为您编写代码，因此最好包括您编写的代码、收到的错误消息，并解释如何将输入转换为输出的规则，而不是只给出一个示例。明白。我已经解决了这个问题。感谢所有人的帮助，代码或其他。

h.each_with_object([]) do |(k0,v0),arr|
  v0.each do |k1,v1|
    v1.each.map do |k2,v2| 
      arr << { "target_date"=>k0, "location"=>k1, "id"=>k2, "value"=>v2 }
    end
  end
end
  #=> <same as for first method>

{ "2018-05-16"=>{ "ABCD"=>{ 92=>0.14, 44=>0.13 }, "EFGH"=>{ 12=>0.24, 34=>0.23 } },
  "2018-05-17"=>{ "ABCD"=>{ 52=>0.34, 34=>0.33 }, "EFGH"=>{ 42=>0.44, 74=>0.43 } } }

[{"target_date"=>"2018-05-16", "location"=>"ABCD", "id"=>92, "value"=>0.14},
 {"target_date"=>"2018-05-16", "location"=>"ABCD", "id"=>44, "value"=>0.13},
 {"target_date"=>"2018-05-16", "location"=>"EFGH", "id"=>12, "value"=>0.24},
 {"target_date"=>"2018-05-16", "location"=>"EFGH", "id"=>34, "value"=>0.23},
 {"target_date"=>"2018-05-17", "location"=>"ABCD", "id"=>52, "value"=>0.34},
 {"target_date"=>"2018-05-17", "location"=>"ABCD", "id"=>34, "value"=>0.33},
 {"target_date"=>"2018-05-17", "location"=>"EFGH", "id"=>42, "value"=>0.44},
 {"target_date"=>"2018-05-17", "location"=>"EFGH", "id"=>74, "value"=>0.43}]