mongodb-query

问题 iam trying to read a mongodb collection document by document in order to fetch every record encrypt some of fields in the record and put it back to database. for record in coll.find(): #modifying record here coll.update(record) this is causing a serious problem i.e already updated documents are read again by cursor and same document is processed again in loop (same document is trying to update again) hope this may be one of the solution to the problem. list_coll = [record for record in coll

问题 This question already has answers here : Query for documents where array size is greater than 1 (11 answers) Closed 3 years ago . I have a collection like { "_id": "201503110040020021", "Line": "1", // several documents may have this Line value "LineStart": ISODate("2015-03-11T06:49:35.000Z"), "SSCEXPEND": [{ "Secuence": 10, "Title": 1, }, { "Secuence": 183, "Title": 613, }, ... ], } { "_id": "201503110040020022", "Line": "1", // several documents may have this Line value "LineStart": ISODate

问题 I have a question for this situation with a collection in mongodb this is my Post collection { "_id" : ObjectId("530f67584fb1a510bc18c03f"), "creatorId" : "5f6f2c26-4101-4eae-90d1-20d109bea925", "creationDate" : ISODate("0001-01-01T00:00:00Z"), "category" : 23, "location" : [ -60.67045855832774, 52.86982649605247 ], "replies" : [ { "_id" : ObjectId("531acfc34fb1a50edc86fdcb"), "creatorId" : "0891f887-a6bc-4183-be10-2653b7b45e79" }, { "_id" : ObjectId("531acfc34fb1a50edc86fdcb"), "creatorId" :

问题 Below is the schema for an array contacts. The contacts array has a field hashtag which is another array. How do I delete an element openLove from the array Hashtags? "contacts" : [ { "addedDate" : ISODate("2015-12-02T09:06:09.891Z"), "personEmailId" : "tell.fadgfdg@gmail.com", "_id" : ObjectId("565eb481bf35eeb83d7f9f13"), "verified" : true, "favorite" : true, "linkedinUserName" : null, "facebookUserName" : null, "twitterUserName" : "IamlifePaul", "count" : 2, "relationshipStrength_updated" :

问题 I am trying to calculate total value if that value exits. But query is not working 100%. So can somebody help me to solve this problem. Here my sample document. I have attached two documents. Please these documents & find out best solution Document : 1 { "_id" : 1"), "message_count" : 4, "messages" : { "data" : [ { "id" : "11", "saleValue": 1000 }, { "id" : "112", "saleValue": 1400 }, { "id" : "22", }, { "id" : "234", "saleValue": 111 } ], }, "createdTime" : ISODate("2018-03-18T10:18:48.000Z"

问题 Below mongodb query is not returning the document. What is wrong with the query? I want to specify $where to match an element in array [EDIT] Above problem is a simplified version of my scenario. I am using a spring data mongodb repository. I want to specify the query using @Query annotation. Was hoping the $where part to be simple comparison and not a full fledged javascript function. something like @Query ( value=" { flag: true, $where: \"this.versions.version == this.defaultVersion \"}",

问题 I need a regular expression to validate a String like this: 1678;1678;1678;1678 and 1;0;1;1;0;1 I tried to use this pattern: db.getCollection('CollectionName').find( { "magnitude": /^[1678][1678]$/, "flag": /^[1][1]$/ } ) but it doesnt works, i try this two patterns that works separate but not both at the same time db.getCollection('CollectionName').find( { "magnitude": /[1678]$/, "flag": /[1]$/ } ) db.getCollection('CollectionName').find( { "magnitude": /^[1678]/, "flag": /^[1]/ } ) I didnt

问题 Consider documents that contain an arrays of ID of another collection, how can I find documents applying a filter based on the related collection using mongoose? I can't find my error Installation.aggregate( [ // Stage 1 { $lookup: { from: "users", localField: "_id", foreignField: "_id", as: "Users" } }, // Stage 2 { $unwind: { path: "$Users" } }, // Stage 3 { $match: {"Users.Email1" : "test@test.com"} }, { $sort: { _id: -1 } }, { $limit: 10 } ] ,function (err, installations) { console.log

问题 I have the following metrics collection: { name: "Hello", values: [ { value: 2629, date: "2016-10-28T07:00:00.000Z", _id: "58453abfef7aaa15ac1fdee8" }, { value: 1568, date: "2016-10-29T07:00:00.000Z", _id: "58453abfef7aaa15ac1fdee7" }, { value: 1547, date: "2016-10-30T07:00:00.000Z", _id: "58453abfef7aaa15ac1fdee6" }, { value: 1497, date: "2016-10-31T07:00:00.000Z", _id: "58453abfef7aaa15ac1fdee5" }, { value: 3031, date: "2016-11-01T07:00:00.000Z", _id: "58453abfef7aaa15ac1fdee4" }, { value:

问题 This should be a fairly simple one. myobject has various properties, _id, name, createdBy, date etc In my find query I want to only return specific fields from within myObject. So for example, what would I need to do to modify the find query below so that only name was returned? myCollection.find({createdBy: someId}, {fields: {myObject: 1}}).fetch(); Currently this will return everything in myObject which it should do, I just want one field within myObject returned. 回答1: Here is a way to do