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What is the Virtual of mongoose?
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. ...
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Explain this custom mongoose schema method
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...
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About the return value of mongoose populate
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...
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A subset of a subset of mongoose queries
first of all, the models of my mongoose is as follows:
var clubsSchema = new mongoose.Schema({
"clubCreatetime": String,
"clubCreater": String,
"clubName": String,
"clubDescription": String,
&...
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What is mongoose streaming??
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!
...
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Is mongoose's validator invalid for update?
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...
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What is the difference between mongoose's error report: timed out and socket closed? Under what circumstances do they appear?
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...
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How to relate the new data in mongoose association table
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...
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The problem of how mongoose, mongodb db.collection.find () syntax is introduced into query
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...
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Mongoose definition completed schema query data not available
schema is defined in this way
const mongoose = app.mongoose;
const { Schema } = mongoose;
const UserSchema = new Schema({
phone: {
type: String
},
unphone: {
type: String
}
...
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Mongodb database reported an error, why?
mongoose
What is the reason for ?
...
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How to write mongoose association fuzzy matching search
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...
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How do I view all the syntax of Mongoose?
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: { ...
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How does mongoose query based on join table fields or virtual fields?
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 } },
...
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Does console.log call the toObject method of the mongoose document?
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,...
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Mongoose query how to sort? again on top of a sort condition
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
...
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Mongoose fuzzy query based on Chinese characters
first of all, I have a club community table (collection); then I want to find the community with the Chinese character in its name according to the fuzzy search of the input Chinese character. For example: societies are: "Tianyue run " and "Tianyue V...
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How to use Date.now + in mongoose for half an hour?
createdTime: {type: Date, required: true, default: Date.now},
+30
endTime: {type: Date, required: true, default: Date.now + }
how to implement Date.now + for half an hour
...
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Koa encountered being unable to get data when reading mongodb data
< H2 > question < H2 >
when find () is used in findAddUsers.js , the data can be read normally, but there is no data in return
< H2 > Code < H2 >
findAddUsers.js
const mongoose = require( mongoose )
let Schema = mongoose.Schema
let UserSchem...
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How to set objectId to userId when mongoose creates a user
const UserSchema = new Schema({
userId:Schema.Types.ObjectId,
username: String,
mobile: String,
password: String,
remarks: String,
createAt: {type: Date, default: Date.now},
updateAt: {type: Date, default: Date.now},
...
