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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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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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Mongodb database reported an error, why?
mongoose
What is the reason for ?
...
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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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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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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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Mongoose multiple save methods save how to get the overall save results?
:projectDao.js
var mongoose = require( mongoose )
const Project = mongoose.model( Project )
exports.createProject = async(data) => {
data.m.projectModelId=data.m.projectModel.split( , )[0]
data.m.projectModelName=data.m.projectModel.spli...
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Please tell me about how mongoose uses updateMany to update in batches.
Schema:
the update I want to implement is to store the same carId, for the stopName in the stops array. How should I implement such batch updates in mongoose? Common Update on the Internet is for a single field, did not encounter such a case, please ...
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[mongoose] how does populate relate to a non-_ id field?
new Schema({
pid: {type: String, ref: product },
sid: {type: String, ref: sale },
}));
suppose there are product and sale two collections
pid and sid both specify user_id of the product and sale collections instead of _ id
...
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Use mongoose to connect to the specified database of MongoDB
1. A user created in the admin database in MongoDB that is used to connect to another database myBase;
2. Use mongoose to connect to MongoDB, when the connection address is
mongodb: username:password@my-server myBase?authSource=admin
3. Unable ...
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How does mongoose find a value in an array?
for example
const ProjectSchema = new mongoose.Schema ({)
name : { type:String },
time : { type:Date, default:Date.now },
url : { type: String},
user : { type: Object},
proId : {type: String},
spaceId : {type: String},
description: {type: String...
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How do I delete data at a specific location in an array in the Models of Mongoose?
problem description
how do I delete data at a specific location in an array in mongodb? the entity of an aircraft like this:
number:B-xxxx,
components:[fuselage,wings,engines,landinggears]
I now want to delete the third data in components, but I c...
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Mongoose populate doesn't seem to work. I've been confused for two days.
problem description
mongoose populate doesn t seem to work. Confusingly, I use it in another part of the project, and it s normal .
the environmental background of the problems and what methods you have tried
mongodb: 4.0.1 mongoose: 5.2.9
rel...
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Java implements mongodb multi-condition query. It is best to take the request parameters dynamically.
query conditions are composed of String and List, such as: (List < String > id, String location, String status,.)
The exact number of fields in the parameter is not certain. There may be more than one .
how to implement this situation? you d better ...
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Express is using Model to operate mongodb Times wrong, I don't know why, ask for advice
when you create a user, you will first query the data in the table. There is a mistake here in the query. I don t understand the reason. Please give me some advice:
user model: models User.js
const mongoose = require( mongoose );
const Schema = ...
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Egg project connection mongoose copy set (Replica Set) connection
problem description egg project uses mongoose mongoose to report error failed to connect to server,
PRIMARY:hostA, master node SECONDARY:hostB, hostC; slave node one master and two slaves, both ports are 27017
copy set set:rs0
Url: mongodb: ...
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Egg project connection mongoose copy set (Replica Set) connection
problem description egg project uses mongoose mongoose to report error failed to connect to server,
PRIMARY:hostA, master node SECONDARY:hostB, hostC; slave node one master and two slaves, both ports are 27017
copy set set:rs0
Url: mongodb: ...
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Koa1 cooperates with mongoose to return data asynchronously
problem description
version: koa@1.2.2,mongoose@5.4.1
request test . The doc that is queried and returned has information, but the front end always prompts interface 404 whether to return the data queried in the database asynchronously, but doe...
