扁平化 JSON 数据的最佳方法 [关闭]

Question

我有如下 JSON 数据：

    "Positions": [
            {
              "CRVL_CMB_AMT": 0,
              "CRVL_PERUT_CMB_AMT": null,
              "ISS_ID": "USD",
              "LOCAL_CURR_CDE": "USD",
              "QUANTITY": -4739568084,
              "UT_PRC_CMB_AMT": 100,
              "VALVAL_CMB_AMT": -4739568084,
              "VALVAL_ALT_CMB_AMT": -4739568084,
              "Instrument": {
                "ISS_NME": "US DOLLAR",
                "ISS_TYP": "CASH",
                "ASSET_CLASS_MNEM": "BALANCE"
              }
            },
            {
              "CRVL_CMB_AMT": 0,
              "CRVL_PERUT_CMB_AMT": null,
              "ISS_ID": "REPO-USD-WF",
              "LOCAL_CURR_CDE": "USD",
              "QUANTITY": -770000,
              "UT_PRC_CMB_AMT": 100,
              "VALVAL_CMB_AMT": -770122,
              "VALVAL_ALT_CMB_AMT": -770122,
              "Instrument": {
                "ISS_NME": "REPURCHASE AGREEMENT -  USD WF",
                "ISS_TYP": "REPO",
                "ASSET_CLASS_MNEM": "CURR EQUIV"
              }
            },
            {
              "CRVL_CMB_AMT": 0,
              "CRVL_PERUT_CMB_AMT": null,
              "ISS_ID": "REPO-USD-GS",
              "LOCAL_CURR_CDE": "USD",
              "QUANTITY": -770000,
              "UT_PRC_CMB_AMT": 100,
              "VALVAL_CMB_AMT": -770122,
              "VALVAL_ALT_CMB_AMT": -770122,
              "Instrument": {
                "ISS_NME": "REPURCHASE AGREEMENT -  USD GS",
                "ISS_TYP": "REPO",
                "ASSET_CLASS_MNEM": "CURR EQUIV"
              }
            }
]

我想将此 JSON 转换为：

    [{
              "CRVL_CMB_AMT": 0,
              "CRVL_PERUT_CMB_AMT": null,
              "ISS_ID": "USD",
              "LOCAL_CURR_CDE": "USD",
              "QUANTITY": -4739568084,
              "UT_PRC_CMB_AMT": 100,
              "VALVAL_CMB_AMT": -4739568084,
              "VALVAL_ALT_CMB_AMT": -4739568084,          
              "ISS_NME": "US DOLLAR",
              "ISS_TYP": "CASH",
              "ASSET_CLASS_MNEM": "BALANCE"              
            },
{
                  "CRVL_CMB_AMT": 0,
                  "CRVL_PERUT_CMB_AMT": null,
                  "ISS_ID": "REPO-USD-WF",
                  "LOCAL_CURR_CDE": "USD",
                  "QUANTITY": -770000,
                  "UT_PRC_CMB_AMT": 100,
                  "VALVAL_CMB_AMT": -770122,
                  "VALVAL_ALT_CMB_AMT": -770122,
                    "ISS_NME": "REPURCHASE AGREEMENT -  USD WF",
                    "ISS_TYP": "REPO",
                    "ASSET_CLASS_MNEM": "CURR EQUIV"
                },
                {
                  "CRVL_CMB_AMT": 0,
                  "CRVL_PERUT_CMB_AMT": null,
                  "ISS_ID": "REPO-USD-GS",
                  "LOCAL_CURR_CDE": "USD",
                  "QUANTITY": -770000,
                  "UT_PRC_CMB_AMT": 100,
                  "VALVAL_CMB_AMT": -770122,
                  "VALVAL_ALT_CMB_AMT": -770122,
                    "ISS_NME": "REPURCHASE AGREEMENT -  USD GS",
                    "ISS_TYP": "REPO",
                    "ASSET_CLASS_MNEM": "CURR EQUIV"
                }]

有没有什么有效的方法来解决这个问题。数组的长度可以非常大，一万。

谢谢

Answer 1

如果是静态键，只需提取Instrument并传播到对象：

const data = {"Positions":[{"CRVL_CMB_AMT":0,"CRVL_PERUT_CMB_AMT":null,"ISS_ID":"USD","LOCAL_CURR_CDE":"USD","QUANTITY":-4739568084,"UT_PRC_CMB_AMT":100,"VALVAL_CMB_AMT":-4739568084,"VALVAL_ALT_CMB_AMT":-4739568084,"Instrument":{"ISS_NME":"US DOLLAR","ISS_TYP":"CASH","ASSET_CLASS_MNEM":"BALANCE"}},{"CRVL_CMB_AMT":0,"CRVL_PERUT_CMB_AMT":null,"ISS_ID":"REPO-USD-WF","LOCAL_CURR_CDE":"USD","QUANTITY":-770000,"UT_PRC_CMB_AMT":100,"VALVAL_CMB_AMT":-770122,"VALVAL_ALT_CMB_AMT":-770122,"Instrument":{"ISS_NME":"REPURCHASE AGREEMENT -  USD WF","ISS_TYP":"REPO","ASSET_CLASS_MNEM":"CURR EQUIV"}},{"CRVL_CMB_AMT":0,"CRVL_PERUT_CMB_AMT":null,"ISS_ID":"REPO-USD-GS","LOCAL_CURR_CDE":"USD","QUANTITY":-770000,"UT_PRC_CMB_AMT":100,"VALVAL_CMB_AMT":-770122,"VALVAL_ALT_CMB_AMT":-770122,"Instrument":{"ISS_NME":"REPURCHASE AGREEMENT -  USD GS","ISS_TYP":"REPO","ASSET_CLASS_MNEM":"CURR EQUIV"}}]};

const res = Object.values(data)[0].map(({ Instrument, ...o }) => ({ ...Instrument, ...o }));

console.log(res);

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要动态执行此操作并检测哪些项目是对象，您需要遍历每个属性：

const data = {"Positions":[{"CRVL_CMB_AMT":0,"CRVL_PERUT_CMB_AMT":null,"ISS_ID":"USD","LOCAL_CURR_CDE":"USD","QUANTITY":-4739568084,"UT_PRC_CMB_AMT":100,"VALVAL_CMB_AMT":-4739568084,"VALVAL_ALT_CMB_AMT":-4739568084,"Instrument":{"ISS_NME":"US DOLLAR","ISS_TYP":"CASH","ASSET_CLASS_MNEM":"BALANCE"}},{"CRVL_CMB_AMT":0,"CRVL_PERUT_CMB_AMT":null,"ISS_ID":"REPO-USD-WF","LOCAL_CURR_CDE":"USD","QUANTITY":-770000,"UT_PRC_CMB_AMT":100,"VALVAL_CMB_AMT":-770122,"VALVAL_ALT_CMB_AMT":-770122,"Instrument":{"ISS_NME":"REPURCHASE AGREEMENT -  USD WF","ISS_TYP":"REPO","ASSET_CLASS_MNEM":"CURR EQUIV"}},{"CRVL_CMB_AMT":0,"CRVL_PERUT_CMB_AMT":null,"ISS_ID":"REPO-USD-GS","LOCAL_CURR_CDE":"USD","QUANTITY":-770000,"UT_PRC_CMB_AMT":100,"VALVAL_CMB_AMT":-770122,"VALVAL_ALT_CMB_AMT":-770122,"Instrument":{"ISS_NME":"REPURCHASE AGREEMENT -  USD GS","ISS_TYP":"REPO","ASSET_CLASS_MNEM":"CURR EQUIV"}}]};

const res = Object.values(data)[0].map(e => {
  Object.entries(e).forEach(([k, v]) => {
    if (v && typeof v == "object" && !v.map) {
      e = { ...e, ...v };
      delete e[k];
    }
  });
  return e;
});

console.log(res);

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以上内容适用于单一深度的任何嵌套对象。