mongodb-query

问题 I need to search for the existence of a property that is within another object. the collection contains documents that look like: "properties": { "source": { "a/name": 12837, "a/different/name": 76129 } } As you can see below, part of the query string is from a variable. With some help from JohnnyHK (see mongo query - does property exist? for more info), I've got a query that works by doing the following: var name = 'a/name'; var query = {}; query['properties.source.' + name] = {$exists: true

问题 This question already has answers here : Retrieve only the queried element in an object array in MongoDB collection (11 answers) Closed last year . How can I query (in MongoDB) this nested json structure in order to get only the nested object which has the "position" value equal to "currentPosition" value? { "JobId": "123" "currentPosition" : NumberInt(18), "details" : [ { "position": NumberInt(18), "fname" : "Alexander", "lname" : "A", }, { "position": NumberInt(18), "fname" : "Doug", "lname

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 This question involves getting distinct values of a nested document in Mongo DB using C#. I have a collection of documents, each document having the structure: { key1: value1, key2: value2, key3: { nestedKey1: nestedValue1, nestedKey1: nestedValue1 } } I need to query a list of distinct nestedKey1 values based on the value of key1 . I can do this (using a shell in Robomongo) by using the command: db.runCommand({distinct:'collection_name', key:'key3.nestedKey1', query: {key1: 'some_value'}})

问题 I have a .NET app which uses MongoDB so I am using the Mongo C# driver. The driver version I am currently using is 1.9.2 and everything in my app works as expected. However I am trying to upgrade the Mongo driver to latest version 2.7.0 however I am having some issues getting some things working. The below Code snippet is where I am facing an issue with latest version of driver public IQueryable<Location> SearchByLocationDistance(double latitude, double longitude, double rangeInKm) { var

问题 Although i have found a similar question on stackOverFlow MongoDB copy a field to another collection with a foreign key I want to copy a field name from userdetails collection to user collection where userId in userDetails equals _id in user. user collection { "_id" : ObjectId("5b97743bbff66e0be66283cc"), "username" : "mmi_superadmin", "accId" : "acc1" } { "_id" : "c21d580ea3ca5c7a1664bd5feb57f0c8", "username" : "client", "accId" : "acc1" } userDetail collection { "_id" : ObjectId(

问题 I have two fields 'company' and 'url'. I want to sort it by number of times distinct 'company' is occurring and then display three 'url' corresponding to that particular company. Data is stored like this: { "_id" : ObjectId("56c4f73664af6f7305f3670f"), "title" : "Full Stack Software Developer", "url" : "http://www.indeed.com/cmp/Upside-Commerce,-Inc./jobs/Full-Stack-Software-Developer-6e93e36ea5d0e57e?sjdu=QwrRXKrqZ3CNX5W-O9jEvRQls7y2xdBHzhqWkvhd5FFfs8wS9wesfMWXjNNFaUXen2pO-kyc_Qbr7-

问题 My mongoose collection looks something like: var followSchema = new Schema({ facebookId: {type: String, required: true}, players : [], fans: [], }); When a player wants to follow another user, I add that user's id into the players[] array. In order to achieve this I first look up the player's record: var myRecord = FollowModel.findOneAndUpdate( {facebookId: req.user.facebookId}, {$setOnInsert: {}}, {upsert: true, new : true} ); The above ensures that if the player doesn't exist, one is

问题 I have vehicles collection with the following schema, all the articles are just general products (no child products included): { "_id" : ObjectId("554995ac3d77c8320f2f1d2e"), "model" : "ILX", "year" : 2015, "make" : "Acura", "motor" : { "cylinder" : 4, "liters" : "1.5" }, "products" : [ ObjectId("554f92433d77c803836fefe3"), ... ] } And I have products collection, some of them are general products related with warehouse sku's and some products are "son" products that fit in multiples general

问题 Yes, I know I should call it from server side. But the purpose is to invoke MongoDB strait from the react-redux app. It's like firebase serverless apps do. I write import mongoose from 'mongoose'; let mongoDB = 'mongodb://127.0.0.1/my_database'; mongoose.connect(mongoDB); mongoose.Promise = global.Promise; let db = mongoose.connection; db.on('error', console.error.bind(console, 'MongoDB connection error:')); And I get: TypeError: __ WEBPACK_IMPORTED_MODULE_6_mongoose___default.a.connect is