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节点js中唯一的json数据对象

node.js json arrays javascript

user8576367 · 技术社区 · 7 年前

我有这样的json数据,

var data = [ { _id: 5abb46b060808f3a2096f91d,
    patient_name: 'krishnaaaannnn',
    gender: 'male',
    charge_id: 5ab243ac73959deb3ad79fec,
    description: 'suffering from pain',
    hospital_id: 5aa92df9ec6b3cc78ff88afe,
    doctor_id: 5af142f879f06c22f5359be3 },
  { _id: 5af143a779f06c22f5359be4,
    patient_name: 'Rajesh',
    gender: 'male',
    description: 'suffering from fever',
    charge_id: 5aaa628e9ae2a2a642b7495c,
    hospital_id: 5aa92df9ec6b3cc78ff88afe,
    doctor_id: 5af142f879f06c22f5359be3 },
  { _id: 5af144685f2f292b2cc3af6d,
    patient_name: 'krishh',
    gender: 'male',
    description: 'suffering from fever',
    charge_id: 5aaa628e9ae2a2a642b7495c,
    hospital_id: 5aa92df9ec6b3cc78ff88afe,
    doctor_id: 5af142f879f06c22f5359be3 },
  { _id: 5abb46b060808f3a2096f91d,
    patient_name: 'krishnaaaannnn',
    gender: 'male',
    charge_id: 5ab243ac73959deb3ad79fec,
    description: 'suffering from pain',
    hospital_id: 5aa92df9ec6b3cc78ff88afe,
    doctor_id: 5af142f879f06c22f5359be3 } ]

哪里 _id: 5abb46b060808f3a2096f91d 重复两次,但我希望包含此数据对象 unique _id ,请帮我解决

更新时间:

这是我的 API 为了从db中获取这些数据,我只需要从同一个集合中获取两次数据,现在我想将最终的json设置为唯一的(\u id)

function billing_read_all(req, res) {
    var auth_data = res.locals.result;
    var searchParam = { token: auth_data[0].token }
    model.find("doctor", searchParam, function (doctor_data) {
        var searchParam1 = { doctor_id: doctor_data[0]._id }
        model.find("patient", searchParam1, function (patient_data) {
            var searchParam2={charge_id:ObjectId("5ab243ac73959deb3ad79fec")}
            model.find("patient", searchParam2, function (patient_data2) {
                var data = patient_data.concat(patient_data2)
                console.log(_.uniq(data))
                res.send(_.uniq(data))
            // res.send(patient_data)
            })
        })
    })
}

3 回复 | 直到 7 年前

Terry Lennox 7 年前

可以将贴图对象用于此目的:

var data = [ { _id: '5abb46b060808f3a2096f91d',
    patient_name: 'krishnaaaannnn',
    gender: 'male',
    charge_id: '5ab243ac73959deb3ad79fec',
    description: 'suffering from pain',
    hospital_id: '5aa92df9ec6b3cc78ff88afe',
    doctor_id: '5af142f879f06c22f5359be3' },
  { _id: '5af143a779f06c22f5359be4',
    patient_name: 'Rajesh',
    gender: 'male',
    description: 'suffering from fever',
    charge_id: '5aaa628e9ae2a2a642b7495c',
    hospital_id: '5aa92df9ec6b3cc78ff88afe',
    doctor_id: '5af142f879f06c22f5359be3' },
  { _id: '5af144685f2f292b2cc3af6d',
    patient_name: 'krishh',
    gender: 'male',
    description: 'suffering from fever',
    charge_id: '5aaa628e9ae2a2a642b7495c',
    hospital_id: '5aa92df9ec6b3cc78ff88afe',
    doctor_id: '5af142f879f06c22f5359be3' },
  { _id: '5abb46b060808f3a2096f91d',
    patient_name: 'krishnaaaannnn',
    gender: 'male',
    charge_id: '5ab243ac73959deb3ad79fec',
    description: 'suffering from pain',
    hospital_id: '5aa92df9ec6b3cc78ff88afe',
    doctor_id: '5af142f879f06c22f5359be3' } ];


var patientMap = new Map();

data.forEach(row => {
    if (!patientMap.has(row._id.toString())) patientMap.set(row._id.toString(), row);
});

// One entry per unique ID now
for (var value of patientMap.values()) {
  console.log(value);
};

或列举:

patientMap.forEach((row) => {
    console.log(row);
});

并将其转换回阵列:

let newArray = [...patientMap.values()]
console.log(newArray);

Hassan Imam Ravi kant 7 年前

您可以使用 array#reduce 具有 Object.values() 将数据分组的依据 _id 。

var data = [ { _id: '5abb46b060808f3a2096f91d', patient_name: 'krishnaaaannnn', gender: 'male', charge_id: '5ab243ac73959deb3ad79fec', description: 'suffering from pain', hospital_id: '5aa92df9ec6b3cc78ff88afe', doctor_id: '5af142f879f06c22f5359be3' }, { _id:'5af143a779f06c22f5359be4', patient_name: 'Rajesh', gender: 'male', description: 'suffering from fever', charge_id: '5aaa628e9ae2a2a642b7495c', hospital_id: '5aa92df9ec6b3cc78ff88afe', doctor_id: '5af142f879f06c22f5359be3' }, { _id: '5af144685f2f292b2cc3af6d',patient_name: 'krishh', gender: 'male', description: 'suffering from fever', charge_id: '5aaa628e9ae2a2a642b7495c', hospital_id: '5aa92df9ec6b3cc78ff88afe', doctor_id: '5af142f879f06c22f5359be3' }, { _id: '5abb46b060808f3a2096f91d', patient_name: 'krishnaaaannnn',gender: 'male', charge_id: '5ab243ac73959deb3ad79fec', description: 'suffering from pain', hospital_id: '5aa92df9ec6b3cc78ff88afe', doctor_id: '5af142f879f06c22f5359be3' } ],
    result = Object.values(data.reduce((r,o) => {
      r[o._id] = r[o._id] || {...o};
      return r;
    },{}));
console.log(result);

ES5代码

'use strict';

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

var data = [{ _id: '5abb46b060808f3a2096f91d', patient_name: 'krishnaaaannnn', gender: 'male', charge_id: '5ab243ac73959deb3ad79fec', description: 'suffering from pain', hospital_id: '5aa92df9ec6b3cc78ff88afe', doctor_id: '5af142f879f06c22f5359be3' }, { _id: '5af143a779f06c22f5359be4', patient_name: 'Rajesh', gender: 'male', description: 'suffering from fever', charge_id: '5aaa628e9ae2a2a642b7495c', hospital_id: '5aa92df9ec6b3cc78ff88afe', doctor_id: '5af142f879f06c22f5359be3' }, { _id: '5af144685f2f292b2cc3af6d', patient_name: 'krishh', gender: 'male', description: 'suffering from fever', charge_id: '5aaa628e9ae2a2a642b7495c', hospital_id: '5aa92df9ec6b3cc78ff88afe', doctor_id: '5af142f879f06c22f5359be3' }, { _id: '5abb46b060808f3a2096f91d', patient_name: 'krishnaaaannnn', gender: 'male', charge_id: '5ab243ac73959deb3ad79fec', description: 'suffering from pain', hospital_id: '5aa92df9ec6b3cc78ff88afe', doctor_id: '5af142f879f06c22f5359be3' }],
    result = Object.values(data.reduce(function (r, o) {
  r[o._id] = r[o._id] || _extends({}, o);
  return r;
}, {}));
console.log(result);

M. F. 7 年前

如果使用下划线之类的库。js它变成了一个单行解决方案,请参见下面的代码片段。基本上是告诉下划线返回一个只包含唯一项的新数组,唯一条件是\u id。

var data = [ { _id: '5abb46b060808f3a2096f91d',
    patient_name: 'krishnaaaannnn',
    gender: 'male',
    charge_id: '5ab243ac73959deb3ad79fec',
    description: 'suffering from pain',
    hospital_id: '5aa92df9ec6b3cc78ff88afe',
    doctor_id: '5af142f879f06c22f5359be3' },
  { _id: '5af143a779f06c22f5359be4',
    patient_name: 'Rajesh',
    gender: 'male',
    description: 'suffering from fever',
    charge_id: '5aaa628e9ae2a2a642b7495c',
    hospital_id: '5aa92df9ec6b3cc78ff88afe',
    doctor_id: '5af142f879f06c22f5359be3' },
  { _id: '5af144685f2f292b2cc3af6d',
    patient_name: 'krishh',
    gender: 'male',
    description: 'suffering from fever',
    charge_id: '5aaa628e9ae2a2a642b7495c',
    hospital_id: '5aa92df9ec6b3cc78ff88afe',
    doctor_id: '5af142f879f06c22f5359be3' },
  { _id: '5abb46b060808f3a2096f91d',
    patient_name: 'krishnaaaannnn',
    gender: 'male',
    charge_id: '5ab243ac73959deb3ad79fec',
    description: 'suffering from pain',
    hospital_id: '5aa92df9ec6b3cc78ff88afe',
    doctor_id: '5af142f879f06c22f5359be3' } ];

var filteredData = _.uniq(data, (item) => item._id);
console.log(filteredData);

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