我有这个文件：
{
"_id" : ObjectId("5b673f525ef92ec6ef16504e"),
"events" : [
{
"name" : "Winner",
"map" : 0,
"something" : []
},
{
"name" : "Winner",
"map" : 2,
"something" : []
},
{
"name" : "DifferentName",
"map" : 2,
"something" : []
}
]
}
如果我运行以下更新：
db.getCollection('test').updateOne({
"_id": ObjectId("5b673f525ef92ec6ef16504e"),
"events.name": "Winner",
"events.map": 2
},
{$push: {
"events.$.something": {
something: "test",
}
}
})
我得到了不好的结果：
{
"_id" : ObjectId("5b673f525ef92ec6ef16504e"),
"events" : [
{
"name" : "Winner",
"map" : 0,
"something" : [
{ …我使用最新版本的mongodb 3.6即使在收到以下错误后......
MongoError: The 'cursor' option is required, except for aggregate with the explain argument
const user = await User.aggregate([
{ $group: {
_id: '$_id',
domain: { $push: "$domain" },
domain: { $push: "$email" },
domain: { $push: "$userName" }
}
}
])
mongoose mongodb node.js mongodb-query aggregation-framework
我有一个数据如下：
> db.PQRCorp.find().pretty()
{
"_id" : 0,
"name" : "Ancy",
"results" : [
{
"evaluation" : "term1",
"score" : 1.463179736705023
},
{
"evaluation" : "term2",
"score" : 11.78273309957772
},
{
"evaluation" : "term3",
"score" : 6.676176060654615
}
]
}
{
"_id" : 1,
"name" : "Mark",
"results" : [
{
"evaluation" : "term1",
"score" : 5.89772766299929
},
{
"evaluation" : "term2",
"score" : 12.7726680028769
},
{
"evaluation" : "term3",
"score" : 2.78092882672992
}
]
}
{
"_id" : 2,
"name" …下面给出的是来自 my_collection
{
"_id":ObjectId("5b3f4e1013aad111501b34c4")
"Text":["kjsdf sdfjgnks vk ekl sdsdd."],
"Title":["lkdjf wufk"],
"List":["3412","1244","7654","8476"],
"__v":0
}
我想聚合my_collection这样的：
所以我写了这段代码：
db.my_collection.aggregate(
[
{
$addFields: {
totalList: { $size: "$List" } // I can achieve the 1st point with this
}
},
{ $project : {
__v:0, // I can achieve the 2nd point with this
List:
{
$reduce: // I can achieve the 3rd point with this
{
input: "$List",
initialValue: "",
in: …我正在尝试查询一个巨大的 mongo 集合，其中包含大约 50 + 百万条记录。在 mongo 查询中，我只需要几个字段。文档中存在的对象 ID 和 MD5。为此，我做到了
询问 ：
db.getCollection('experimental_engine').find({},{"md5":1,"_id":1})
结果 ：
/* 1 */
{
"_id" : "5cee41f2ca4e0ebf567ffd1be5cdaf1f",
"md5" : "1d813cb29082b13efe572e8088f006dd"
}
/* 2 */
{
"_id" : "fcd79aac0d5c5ebdfd0fa389368ab6f3",
"md5" : "13a1a6cd5c8f1c5eaf3d409f4d809889"
}
/* 3 */
{
"_id" : "2a0b42d01892bd9b7368d045a4c7862c",
"md5" : "2a0b42d01892bd9b7368d045a4c7862c"
}
................
现在，我想同时匹配 "_id" 和 "md5" 并且只得到匹配的值 ( _id = md5) 。
mongo 命令是否支持两个键的匹配值？
请问有什么建议吗？
我想使用 mongodb 在附件数组中推送一个值。我想使用以下条件更新查询。
_id:ObjectId("5b56bd2f3e18580edc85af73") "cardID": ObjectId("5b56c895d0a04836f71aa776") "commentId":"2"
我想推动附件中的价值，任何帮助将不胜感激
这是一个集合对象：
{
"_id" : ObjectId("5b56bd2f3e18580edc85af73"),
"orgId" : "90",
"createdBy" : "test",
"name" : "testname",
"Cards" : [
{
"cardID" : ObjectId("5b56c895d0a04836f71aa776"),
"cardName" : "test Name",
"cardCreated" : "",
"reviewer" : "",
"priority" : "",
"cardPosition" : "",
"membersAssigned" : [
"ggg",
"fff"
],
"labels" : [
"l1",
"l2"
],
"description" : "",
"attachements" : [],
"comments" : [
{
"commentId" : "2",
"commentedBy" : "test",
"date" : "",
"comment" : "Hello world", …我想知道一场演出中预订了多少个座位。
每个节目文档中都有一个“showTakenSeats”对象。
这是初始数据：
[
{
"_id": "5b658d37692f2e3c881960cb",
"_MovieId": "5b5835dd86ab401494263861",
"_TheaterId": "5b3dfeb217bc8c23f0e7ec3f",
"dateTime": "2018-08-04T14:00:00.000Z",
"showTakenSeats": {
"0-0": "5b658f79dd8bb938289e2e0b",
"0-1": "5b658f79dd8bb938289e2e0b",
"0-2": "5b658f79dd8bb938289e2e0b"
},
"__v": 0,
},
{
"_id": "5b658d4a692f2e3c881960cc",
"_MovieId": "5b584eb186ab401494263868",
"_TheaterId": "5b45d269a53b0c05f8959260",
"dateTime": "2018-08-04T13:00:00.000Z",
"showTakenSeats": {
"0-0": "5b65904bdd8bb938289e2e0d",
"0-1": "5b65904bdd8bb938289e2e0d",
"0-2": "5b65904bdd8bb938289e2e0d"
},
"__v": 0,
},
{
"_id": "5b658fd1dd8bb938289e2e0c",
"_MovieId": "5b575452478afb72ec65f8f6",
"_TheaterId": "5b45d219a53b0c05f895925f",
"dateTime": "2018-08-04T20:00:00.000Z",
"showTakenSeats": {},
"__v": 0,
},
{
"_id": "5b6593d80d48d9394877dd09",
"_MovieId": "5b584eb186ab401494263868",
"_TheaterId": "5b446a8768db4e2e980723ab",
"dateTime": "2018-08-05T10:00:00.000Z",
"showTakenSeats": {},
"__v": 0,
},
{
"_id": "5b65943b0d48d9394877dd0a",
"_MovieId": "5b584eb186ab401494263868",
"_TheaterId": …我在网上搜索过，但找不到与我的情况相符的内容。情况是这样的。
我正在使用聚合将一个集合和来自另一个集合的一个文档组合在一起
restaurants.aggregate([
{
$match: {
_id: {
$in: idList
}
}
},
{
$lookup: {
from: "tags",
localField: "details.restaurantType",
foreignField: "details.restaurantType._id",
as: "types"
}
},
{
$project: {
restaurantName: "$details.restaurantName",
restaurantType: "$details.restaurantType",
type: {
$filter: {
input: "$types",
as: "type",
cond: {
$eq: ["$$type._id", "$details.restaurantType"]
}
}
},
currency: "$details.currency",
costPerPax: "$details.costPerPax"
}
}
]);
我当前结果中的“类型”字段是 []，我需要一个匹配的值
[
{
"id": "5c20c7a0036dda80a8baabcc",
"restaurantName": "Villagio Restaurant Sutera Mall",
"type": [],
"currency": "RM",
"costPerPax": 22,
},
{
"id": "5c20ceb07715216d3c217b7a",
"restaurantName": "Thai …我正在尝试查询集合中的数组，如果对象存在于数组中，则投影值“true”。如果对象不存在于数组中，则投影“false”。我在 MongoDB 中工作，我对它不太熟悉。
在我的场景中，我有两个正在使用的集合。我正在聚合一组“员工”成员，并且正在对一组“企业”执行 $lookup 功能。在“业务”中，我拥有一系列业务能力。
例如，我有员工集合
staff = [
...
{_id: 1, businessId: 11},
{_id: 2, businessId: 22},
....
]
企业集合
businesses = [
...
{_id: 11, capabilities: ["claiming", "pushing"]},
{_id: 22, capabilities: ["claiming", "popping"]},
....
]
并有一个 $lookup 设置，如
db.getCollection('staff').aggregate([
{
$lookup:
{
from: "businesses",
localField: "businessId",
foreignField: "_id",
as: "business_Info"
}
},
如果“声称”出现在“能力”中，我如何将每个员工的项目 $project 变成 $canClaim: true 之类的值？
我的数据库具有这种类型的结构。我想查找“ JAN”数组包含的文档数。我正在尝试以不同的方式进行操作，但是没有任何效果。如果有人帮助的话，那会很棒。
{
"_id" : ObjectId("5cd8609db20663a19e2c362c"),
"2017" : {
"JAN" : [
{
"SYMBOL" : "20MICRONS",
"SERIES" : "EQ",
"OPEN" : "33.4",
"HIGH" : "34.3",
"LOW" : "33",
},
{
"SYMBOL" : "3IINFOTECH",
"SERIES" : "EQ",
"OPEN" : "5.8",
"HIGH" : "5.8",
"LOW" : "5.55",
},
{
"SYMBOL" : "3MINDIA",
"SERIES" : "EQ",
"OPEN" : "11199.9",
"HIGH" : "11233",
"LOW" : "10861",
}
]
}
}