aggregation-framework

问题 I have a schema like this: { tags:[ { id:"t1", score:70 }, { id:"t1", score:60 } ] } I want to sort the query on tag.id search to get sorted by the corresponding score. So if I search db.collection.find({tags.id:"t1"}).sort({tags.score:-1}) , it sorted by score of the "t1" object not other tags. Any suggestion? 回答1: If you need to calculate out something like this at runtime, with "filtered" content from the array determining the sort order, then you best do something with .aggregate() to

问题 I am doing a comparison of mongodb with respect to mysql and imported the mysql data into the mongodb collection (>500000 records). the collection looks like this: { "_id" : ObjectId(""), "idSequence" : , "TestNumber" : , "TestName" : "", "S1" : , "S2" : , "Slottxt" : "", "DUT" : , "DUTtxt" : "", "DUTver" : "", "Voltage" : , "Temperature" : , "Rate" : , "ParamX" : "", "ParamY" : "", "Result" : , "TimeStart" : new Date(""), "TimeStop" : new Date(""), "Operator" : "", "ErrorNumber" : ,

问题 I'm trying to run a $graphLookup like demonstrated in print bellow: The objective is to, given a specific record (commented $match there), retrieve it's full "path" throught immediateAncestors property. As you can see, it's not happening. I introduced $convert here to deal with _id from collection as string , believing it could be possible to "match" with _id from immediateAncestors records list (which is a string ). So, I did run another test with different data (no ObjectId s involved): db

问题 I have the following aggregator function, which I am not firing in mongo console directly. I am passing this aggregator to an API as a query string. I will encode the following aggregator directly and pass to a get request as a query string. [ { "$limit": 500 }, { "$match": { "timestamp": { "$gte": { "$dte": "2017-07-01" }, "$lt": { "$dte": "2020-12-31" } } } }, { "$group": { "_id": { "$year": "$timestamp" }, "scores": { "$push": "$statement.result.score.scaled" }, "duration_seconds": { "

问题 I have a User collection, which further have a 'UserSubscription' collection, which further have 'Subscription > Publication'. Mongo collection looks like this /* 1 */ { "_id" : 1, "UserSubscriptions" : [ { "_id" : 1, "Subscription" : { "_id" : 1, "Publication" : { "_id" : 1, "Code" : "1MM", }, }, { "_id" : 2, "Subscription" : { "_id" : 2, "Publication" : { "_id" : 2, "Code" : "2MM", }, }, { "_id" : 7, "Subscription" : { "_id" : 7, "Publication" : { "_id" : 1, "Code" : "1MM", }, } ] } /* 2 */

问题 I have Mongo documents which have array number values in order (it's by day) and I want to sum the same values across multiple documents for each position grouped by field outside of the array. {"_id" : "1", "group" : "A", "value_list" : [1,2,3,4,5,6,7] }, {"_id" : "2", "group" : "B", "value_list" : [10,20,30,40,50,60,70] }, {"_id" : "3", "group" : "A", "value_list" : [1,2,3,4,5,6,7] }, {"_id" : "4", "group" : "B", "value_list" : [10,20,30,40,50,60,70] } So the results I'm after is listed

问题 I have the following json: { "statement":{ "result":{ "duration":"PT0.552S", "completion":true, "success":false } }, "statement":{ "result":{ "duration":"PT0.552S", "completion":true, "success":false } }, "statement":{ "result":{ "duration":"PT0.552S", "completion":true, "success":false } } } How can I write a mongo aggregator to getting the statement -> result -> duration time format that now in ptms string to seconds? I need something like: [ 1131, 648, 1678, ..... ..... ] Here each number

问题 I have collection which contains nested array. I need to fetch the data based on below condition: empId : 19107 address.country: "AUS" group.primaryGroup.primary:"Y" group.subGroup.primarySubGroup.primary : "Y" Input: { "empId": "19107", "address": [ { "street": "no.12 wilson street", "country":"AUS" }, { "description": "No.32 watson street", "country":"CAN" } ], "mobile": 2387468238, "group": [ { "groupId": 75227, "primaryGroup": [ { "primary": "Y" }, { "primary": "N" } ], "subGroup": [ {

问题 I'm trying to get data from one or more subdocuments but I don't know the name of the field that will hold the subdocument. Here are some examples of what the documents look like. https://github.com/vz-risk/VCDB/blob/master/data/json/0C5DE044-B9B4-408D-9E65-D367EED12AB2.json https://github.com/vz-risk/VCDB/blob/master/data/json/064F5887-C2DA-4139-B3AA-D55906F8C30A.json I would like to get the action varieties for these incidents, so in the case of the first one I would like to get action

问题 This question is related to the answer posted here I need to return an aggregation result from a GraphQL query. Here is the query code: const companiesWithNoUsers = { type: new GraphQLList(CompanyType), resolve(root, args, context) { return Company.aggregate([ { $lookup: { from: "users", localField: "id", foreignField: "company_id", as: "company_users" } }, { $match: { "company_users:0": { $exists: false } } } ]).exec(); } }; I´m getting the follwing error at GraphQL: Expected value of type \