我在mongo中有一个收藏集,看起来像这样:
{
"_id" : ObjectId("5c98d6f383d67f243730443b"),
"date" : ISODate("2019-03-24T00:00:00Z"),
"symbol" : "F:ABCD",
"symbolCode" : "wcgahi8gap",
"close" : 8.09,
"high" : 24.82,
"low" : 8.09,
"numPoints" : 8,
"open" : 20.84,
"volume" : 21183
}
{
"_id" : ObjectId("5c98d6f383d67f243730443c"),
"date" : ISODate("2019-03-25T00:00:00Z"),
"symbol" : "F:ABCD",
"symbolCode" : "wcgahi8gap",
"close" : 1.77,
"high" : 23.47,
"low" : 1.77,
"numPoints" : 3,
"open" : 8.21,
"volume" : 9645
}
显示当天结束时的股票价格。我正在尝试编写汇总,以计算1天间隔内每只股票的变化/百分比变化。因此,它应该只是当日休市字段和前一天休市字段之间的差。我怎样才能做到这一点?
这是我到目前为止所拥有的:
const results = await Price.aggregate([
{ $match: { date: { $gte: yesterday } } },
{ $sort: { date: 1 } },
{ $group: { '_id': '$_id',
'old': {
$sum: { $cond: [{ '$eq': [ '$date', yesterday ] }, '$close', 0] }
},
'new': {
$sum: { $cond: [{ '$eq': [ '$date', today ] }, '$close', 0] }
} } },
{ $project: { date: 1, symbol: 1, difference: { $subtract: ['$new', '$old'] } } }
])
我知道我错过了小组赛的重要组成部分,但我无法弄清楚。
答案 0 :(得分:0)
这就是我的做法:
const results = await Price.aggregate([
{ $match: { date: { $gte: yesterday } } },
{ $sort: { date: 1 } },
{ $group: { '_id': '$symbol',
old: {
$sum: {
$cond: [{ $eq: ['$date', yesterday] }, '$close', 0]
}
},
new: {
$sum: {
$cond: [{ $eq: ['$date', today] }, '$close', 0]
}
} } },
{ $project: {
symbol: '$_id',
change: { $subtract: ['$new', '$old'] },
changePrc: { $divide: [{ $subtract: ['$new', '$old'] }, '$old'] }
} }
])
将this的答案用于帮助。