the set of collections I now get through the mongoose query looks like this: [{ _id: "123456", sex: 0 },{ _id: "222222", sex: 1 },{ _id: "111111", sex: 1 },{ _id: "333333", sex: 0 ...
const mongoose = require( mongoose ) mongoose.connect( mongodb: localhost test ) const A = mongoose.model( A , new mongoose.Schema({name: String})) A.create({name: aaa }, (err, doc) => { console.log(doc) { _id: 5ae424bdcc21a02b700f9342,...
router.get( VaguePartner , function (req, res, next) { const keyWords = req.query.keyWords t_Superior.find().populate( consumer firstsuperior ).where( consumer ).or([ { nickname : { $regex : keyWords, $options: $i } }, ...
I have read the document for a long time, and I have a general understanding of the concept grammar and so on, but when I really write it, I still have a lot of problems and always get stuck. such as the following this.ctx.model.Role.remove({ _id: { ...
suppose there is a table Group User, and the owner of Group is associated with User Group _ id name owner: {type: Schema.ObjectId, ref: User } User _ id name Q: search to find the Group list, fuzzy search according to Group name and User n...
mongoose What is the reason for ? ...
schema is defined in this way const mongoose = app.mongoose; const { Schema } = mongoose; const UserSchema = new Schema({ phone: { type: String }, unphone: { type: String } ...
query router.get(" cartList", (req, res, next) => { User.findOne({ userId: 123456 }, (err, doc) => { }); } query router.get(" cartList", (req, res, next) => { let userId = req.cookies.userId console.log(user...
I am working on an examination system. There are four collections in the system: teacher collection: var mongoose = require( mongoose ); var Schema = mongoose.Schema; var QuestionSchema = new Schema({ name: String, _teacher: { type: Schema.T...
recently, an interface for reading data has been found to take too long to return in the production environment. Project uses nodejs + mongodb Development dependency: questions such as title: what is the difference between: timed out and so...
mongoose defines required, min, max and other validators in scheme, which seems to validate only the documents to be inserted by create (), but does not seem to validate the documents to be updated by update (). if so, what is the use of this validati...
You can stream query results from MongoDB. You need to call the Query-sharpcursor () function to return an instance of QueryCursor. Please do not translate directly. I want to know what cursor is and what stream is, and why I use it, thank you! ...
first of all, the models of my mongoose is as follows: var clubsSchema = new mongoose.Schema({ "clubCreatetime": String, "clubCreater": String, "clubName": String, "clubDescription": String, &...
Story .findOne({ title: Bob goes sledding }) .populate( author ) .exec(function (err, story) { if (err) return handleError(err); console.log( The author is %s , story.author.name); prints "The author is Bob Smith" }); here we...
var animalSchema = new Schema({ name: String, type: String }); animalSchema.methods.findSimilarTypes = function(cb) { return this.model( Animal ).find({ type: this.type }, cb); }; var Animal = mongoose.model( Animal , animalSchema); var dog = new A...
Virtual properties are document properties that you can get and set but that do not get persisted to MongoDB. I don t quite understand this sentence. Please do not translate. I hope you can explain it in your own words. It is better to have examples. ...
I use the local database localhost:1234 to request data report an error request:fail url not in domain list Why do I also report an error locally, and what should I do? ...
wrong format I hope it is the following format. How can I change it? MACnpmnpm MACnpmnpm npm install vue-router Windowsnpmcnpm cnpm install vue-router -save cnpm install vuex --save npm install --re...
<!DOCTYPE html PUBLIC "- W3C DTD XHTML 1.0 Transitional EN" "http: www.w3.org TR xhtml1 DTD xhtml1-transitional.dtd"> <html xmlns="http: www.w3.org 1999 xhtml"> <head> <meta http-equiv="C...
public JsonResult add(@RequestBody(required = false) User user){ if(user == null){ RequestBody ; ; } } ...
I have downloaded the font file used on the site, but I don t know how to replace the corresponding text in the scrapy crawler. what it looks like in html html ...