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. ...
word add watermark ...
problem description use echart to make pie chart, and value is configured in data how can we achieve different value values, but divide the area of the pie chart equally related codes Please paste the code text below (do not replace the code...
problem description I introduced in app.vue that the names of root declaration subcomponents are all in a format similar to aaaVue Why should I use aaa-vue when using the template node of app.vue? <template> <div> <header-vue v-...
data is submitted in the form of form form in the foreground, and the front-end page can be rendered normally through res.render (ejs) in the background. The background code is as follows: router.post( classifyadd , (req, res) => { let {class...
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