mongodb

问题 I am doing a university project and I've read every post regarding my problem, but I am yet to find a solution. Maybe you can help me out. The code is the following: viewerObj.update({_id: currentIDViewerVar} , {minutesWatched: 5},{upsert:true} , function (err,result) { if (err) throw err; console.log("Viewer " + userNameVar + " gespeichert"); console.log("minsWatched" +minsWatched); }); I get the following error. I can't see what I am doing wrong. events.js:160 throw er; // Unhandled 'error'

问题 I am doing a university project and I've read every post regarding my problem, but I am yet to find a solution. Maybe you can help me out. The code is the following: viewerObj.update({_id: currentIDViewerVar} , {minutesWatched: 5},{upsert:true} , function (err,result) { if (err) throw err; console.log("Viewer " + userNameVar + " gespeichert"); console.log("minsWatched" +minsWatched); }); I get the following error. I can't see what I am doing wrong. events.js:160 throw er; // Unhandled 'error'

问题 I have collection like this: { "_id" : ObjectId("4d663451d1e7242c4b68e000"), "topic" : "abc", "subLevel" : { "id" : 1 } } { "_id" : ObjectId("4d6634514cb5cb2c4b69e000"), "topic" : "bce", "subLevel" : { "id" : 1 } } { "_id" : ObjectId("4d6634514cb5cb2c4b70e000"), "topic" : "bec", "subLevel" : { "id" : 2 } } { "_id" : ObjectId("4d6634514cb5cb2c4b70e000"), "topic" : "vvv", "subLevel" : { "id" : 3 } } and I need to count how many documents exist for provided subLevel.id list, for example if I

问题 I am having trouble inserting an image to MongoDB through node.js. My code is as follows: var express = require('express'), mongoose = require('mongoose'), fs = require('fs'), Schema = mongoose.Schema; app = express(), port = process.env.PORT || 3000; var imagePath = '~\images\image1.png'; mongoose.connect('mongodb://localhost/test'); var db = mongoose.connection; var contentSchema = new Schema({ _id: Schema.ObjectId, date: {type: Date, default: Date.now}, user_ip: Number, likes: Number,

问题 I need to update a document using mongoose which contains an array of objects where each object within the array also contains an array of objects. Pseudo code for this would be something like: user.rooms[{where roomname = 'abc123'}].messages.push({message: 'hello', from: 'james'}) Where 'rooms' is an array of objects. And 'messages' is an array of objects which sits inside a room object which itself sits in the rooms array. I am confused as to how to build the query in terms of using $ in

问题 I have a sub document called services in a collection it contains serviceID and type . serviceID is referred to two collections internalservice and externalservice varies based on the type field. internalServices:[{ serviceID:ObjectId('0000000000000'), serviceDesc:'sweeping' }, { serviceID:ObjectId('0000000000000'), serviceDesc:'floor cleaning' }] externalServices:[{ serviceID:ObjectId('0000000000000'), serviceDesc:'painting' }, { serviceID:ObjectId('0000000000000'), serviceDesc:'white

问题 I have a MongoDB collection with some documents that have a field called Personal.FirstName and another field call Personal.Surname. Some documents are messed up and have the persons first name and last name in both fields. For example there are some documents that have Personal.FirstName = 'John Doe' and Personal.Surname = 'John Doe'. I want to write a mongo update statement that will do the following: Find all of the documents that have a Personal section Find all of the documents where

问题 I have a MongoDB collection with some documents that have a field called Personal.FirstName and another field call Personal.Surname. Some documents are messed up and have the persons first name and last name in both fields. For example there are some documents that have Personal.FirstName = 'John Doe' and Personal.Surname = 'John Doe'. I want to write a mongo update statement that will do the following: Find all of the documents that have a Personal section Find all of the documents where

问题 Having this for Flask: example = mongo.db.example got_name = example.find({'name':1}) got_lastname = example.find({'lastname':1}) details = {'name' : got_name, 'lastname' : got_lastname} return render_template('blabla.html', details=details) Then the for loop using Jinja in my HTML (wanting it to be a table): {% for x in details} <tr> <td>{{ x.['name'] }}</td> <td>{{ x.['lastname'] }}</td> </tr> {% endfor %} But it won't work, it doesn't display anything in my table. I wrote this example

问题 I have written a RestController in my SpringBoot app. I am using a MongoDB as well. This is my entity: public class LocationEntity { @Id private String id; private String name; @DBRef(lazy = true) @JsonIgnore private UserEntity owner; private String description; @DBRef(lazy = true) private List<RoleEntity> roles; private Date date; public LocationEntity(String name, UserEntity owner, String description, List<RoleEntity> roles, Date date) { this.name = name; this.owner = owner; this