ruby - 转换哈希结构

Question

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Answer 1

首先，您需要将 JSON 字符串转换为 Ruby 对象。

require "json"
json = %{
[
    {
        "category": "category1",
        "text": "some text"
    },
    {
        "category": "category2",
        "text": "some more text"
    },
    {
        "category": "category1",
        "text": "even more text"
    }
]
}
ary = JSON.parse(json)

现在我们有了一个 Ruby 形式的哈希数组，我们可以操作它了

h = ary.group_by {|i| i["category"]}
#=> {"category1"=>[{"category"=>"category1", "text"=>"some text"}, {"category"=>"category1", "text"=>"even more text"}], "category2"=>[{"category"=>"category2", "text"=>"some more text"}]}

h = h.map {|k,v| {k => v.map {|t| {"text" => t["text"]}}}}
#=> [{"category1"=>[{"text"=>"some text"}, {"text"=>"even more text"}]}, {"category2"=>[{"text"=>"some more text"}]}]

h = h.reduce(&:merge)
#=> {"category1"=>[{"text"=>"some text"}, {"text"=>"even more text"}], "category2"=>[{"text"=>"some more text"}]}

以漂亮的形式打印 JSON 以检查结果

puts JSON.pretty_generate(h)

输出:

{
  "category1": [
    {
      "text": "some text"
    },
    {
      "text": "even more text"
    }
  ],
  "category2": [
    {
      "text": "some more text"
    }
  ]
}