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. ...
ionic3 pull-up load more stutters when running on ios some people know why they have reached the bottom on iOS, but do not get the data immediately. When a pull-up loaded picture appears, it must be moved again to appear, but debugging on the web page ...
the pictures and videos of a website want to be cached the first time they are requested, and will not be requested until the next time they are updated. It is a shopping website. What should be cached at the front end? , Android system, Android side pac...
use the imap extension of php to receive qq messages as follows: $mailbox = "{imap.qq.com:993 imap ssl} INBOX"; $username = "qq "; $password = "qq "; $res = imap_open($mailbox , $username , $password); $count = i...
report this error program cannot solve the puzzle ...
the following error occurred when running php-related commands: Cannot load Zend OPcache - it was already loaded what is not set correctly? ...