[英]MongoDB Aggregation response format to unique key in Nodejs
我从 mongoDB 聚合查询得到响应,它是分组数据和动态的 select 字段,它位于“projectionObj”object:
这是我的 mongodb聚合查询:
let projectionObj = {
"date": 1,
"height": 1,
"bmi": 1,
"level": 1,
}
UpdateForm.aggregate([
{ $match: {
"id": id,
"date": {
"$gte": startdate,
"$lte": enddate,
}}},
{ $group: {
_id: {
year: { $year: "$date" },
month: { $month: "$date" },
day: { $dayOfMonth: "$date" },
},
items: {
$push: '$$ROOT',
}}},
{$project: {
"_id": 0,
"items": projectionObj
}},
])
下面是聚合结果:
[
{
items: [{
date: "2022-03-11",
height: '1',
bmi: '1',
level: '1'
},
{
date: "2022-03-11",
height: '2',
bmi: '2',
level: '2'
}]
},
{
items: [{
date: "2022-03-08",
height: '3',
bmi: '3',
level: '3'
}]
}
]
我想将聚合结果格式化为下面给出的所需格式
{
categories: ["2022-03-11", "2022-03-11", "2022-03-08"],
series: [
{name: "height", data: [1,2,3]},
{name: "bmi", data: [1,2,3]},
{name: "level", data: [1,2,3]},
]
}
首先,我在数组上运行了flatMap
并得到了一个包含单个项目的数组。 然后运行reduce
以根据名称对series
进行分组并将日期添加到categories
中。
但现在系列是 object。根据需要将其转换为数组我在最终结果中覆盖series
以使用Object.values
分组值的数组
let a = [ { items: [{ date: "2022-03-11", height: '1', bmi: '1', level: '1' }, { date: "2022-03-11", height: '2', bmi: '2', level: '2' }] }, { items: [{ date: "2022-03-08", height: '3', bmi: '3', level: '3' }] } ] let res = a.flatMap(el => el.items).reduce((acc,{date,...curr})=>{ acc.categories.push(date) Object.entries(curr).forEach(([k,v])=>{ if(.acc.series[k])acc:series[k]={name,k:data.[]} acc.series[k].data;push(parseInt(v)) }) return acc, }:{categories,[]:series.{}}) res = {..,res:series.Object.values(res.series)} console.log(res)
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