如何在 JSON 结果中分隔键和值

Question

当我调用国家/地区列表时，我从 API 中获取以下数组作为 JSON：

{
"countries": [
    [
        "Andorra",
        "AD"
    ],
    [
        "United Arab Emirates",
        "AE"
    ],
    [
        "Afghanistan",
        "AF"
    ],
    [
        "Antigua and Barbuda",
        "AG"
    ],
    [
        "Anguilla",
        "AI"
    ],
    [
        "Albania",
        "AL"
    ],
    [
        "Armenia",
        "AM"
]]}

这是我的控制器：

def find_countries
    @countries =  CountryStateSelect.countries_collection
    render :json=>{ :countries=> @countries }
  end

我想像这样分隔这个国家/地区列表数组。

{
    "countries": [
        [
            value:"Andorra",
            key: "AD"
        ],
        [
           value: "United Arab Emirates",
            key:"AE"
        ],
        [
           value: "Afghanistan",
            key:"AF"
        ],
        [
            value:"Antigua and Barbuda",
            key:"AG"
        ]
        ]}

我无法识别值和键。如何按上述方式分离此 JSON 响应？

Answer 1

您需要

将每个项目映射到一个对象中

@countries =  CountryStateSelect.countries_collection.map do |name, code|
  Hash[:key, code, :value, name]
end

Answer 2

只需将数组转换为哈希值：

h = _ # your input data given
h[:countries].map!{|a| {value: a[0], key: a[1]} }

Answer 3

input = {
  "countries": [
    ["Andorra", "AD"],
    ["United Arab Emirates", "AE"]        
  ]
} 
input.
  transform_values do |vals|
    vals.map(&%i[value key].method(:zip)).map(&:to_h)
  end
#⇒ {
#   :countries => [
#     [0] {
#         :key => "AD",
#       :value => "Andorra"
#     },
#     [1] {
#         :key => "AE",
#       :value => "United Arab Emirates"
#     }
#   ]
# }

Answer 4

使用 collect 方法：

countries = CountryStateSelect.countries_collection.collect do |country, code|
    { key: code, value: country }
end