mongodb

问题 I want to user commander.js and inquirer.js to ask questions and collect the answer to create a User instance: // index.js const mongoose = require('mongoose'); const User = require('./model/user') const {addUser,listAllUsers,findUserByEmail,updateUser,deleteUser} = require('./model_methods/user_methods') const { program } = require('commander'); var inquirer = require('inquirer'); // connect to DB const db = mongoose.connect('mongodb://localhost:27017/myImportantDates', { useNewUrlParser:

问题 Running sudo pkg install mongodb produces an error stating that no such package exists. I figured this is because it says on this website https://www.freshports.org/databases/mongodb/ that the MongoDB port has expired and has been removed. How do I get a version of MongoDB on my FreeBSD server now? 回答1: I recommend that every time you want to install a package you perform a pkg search pkg search packagename For MongoDB: root@demo:/ # pkg search mongodb mongodb32-3.2.11_2 Distributed document

问题 understanding questions here. I am doing a MERN setup website, and I was updating a field in my database like this: router.post("/updateLogApprovementStatus", (req, res) => { User.findOneAndUpdate( { _id: req.body.userId }, { $set: { log: req.body.newData } } ).then(user => res.json(user.log)); }); But after doing repeated calls to the api with correct data, my data field wasn't updating. However, when I do this: router.post("/updateLogApprovementStatus", (req, res) => { User.findOneAndUpdate

问题 Is there a way to store Dates in local timezone and not in UTC ? This is my schema : var WhispSchema = new mongoose.Schema({ text : String, pos : {latitude: Number, longitude: Number}, distance : {type : Number, default : 0}, created_by : {type : Schema.Types.ObjectId, ref : "UserSchema"}, upvote : {type : Number, default : 0}, downvote : {type : Number, default : 0} }); WhispSchema.plugin(timestamps, { createdAt: 'created_at', updatedAt: 'updated_at' }); But the field "created_at" and

问题 I have made a json file using pandas by combining two other pandas dataframes. But after uploading it to server and importing it to a new database's new collection using mongoimport , I have found that all the blank string fields which should be appeared as null are now showing as NaN . How can I convert these NaN s to null s from mongo shell? Please note that I have to do it from the server, and there is no MongoDBCompass installed there. I have to do everything from console ( PuTTy ). 回答1:

问题 Okay, So I've been writing tests for my node.js app using jest and supertest, for every test suite after the first, I'm getting an error Error: listen EADDRINUSE: address already in use :::3000 , I believe this is because it attempts to start the server on every test file (I have multiple test files *.test.js in /tests ) The top part before tests are described in each test file looks something like this const request = require("supertest"); const app = require("../index.js"); // the express

问题 E.g. I have Java objects: public class Foo { private Example example; } public class Example { private String str1; private String str2; } Field example can be null. I need to get all Foo objects where str1 contains e.g. "text". According to documentation I tried: @Query(value = "{ 'example' : { $exists : true, $elemMatch : { str1 : { $regex: '.*?0.*'} } } }") but it returns empty Page. 回答1: Define the query in the repository: @Repository public interface FooRepo extends MongoRepository<Foo,

问题 I got this structure in my mongodb (2 collections: restaurant and cocktail ) restaurant {id=1001, name="Res1", coor=[12.392, 19.123], cocktail=[13, 0, 92]} cocktail {id=13, name="Capiroska"}, {id=167, name="Capirinha"}, {id=92, name="Negroni"}, {id=0, name="Martini"} Multiple restaurant s and multiple cocktail s, N:N relationship. My goal is to find which different cocktail s I can drink within a specified area. I've already written a query that finds all restaurants near my position like

问题 I have an array of objects that I want to sort by. .sort() at top level works like this according to documentation: Product.findById(productId) .sort({ somefield: -1 }) I have tried something like this: Product.findById(productId) .sort( { requests: { _id: -1 } } ) But I get the following error: TypeError: Invalid sort value: { requests: [object Object] } If I have the object ID's in this order in mongodb (compass) _id: 123456789 _id: 987654321 I want _id 987654321 show first in the list. I

问题 I am working on Aws Machine learning with MERN(Mongodb,Express,React,NodeJS)Stack Code.But the issue is that when I upload the data file (.csv file) for process machine learning after sometime process training is failed with TrainingFailed Error which is follow: AlgorithmError: CannotStartContainerError. Please make sure the container can be run with 'docker run train'. Please refer SageMaker documentation for details. It is possible that the Dockerfile's entrypoint is not properly defined,