requirements, filter the time range of the data and describe the picture
meta: {
createAt: {
type: Date,
dafault: Date.now()
},
updateAt: {
type: Date,
dafault: Date.now()
}
}
requirements, filter the time range of the data and describe the picture
meta: {
createAt: {
type: Date,
dafault: Date.now()
},
updateAt: {
type: Date,
dafault: Date.now()
}
}//createAt2018-07-25
yourModel.findOne(
{"meta.createAt":{$gte:new Date("2019-07-25"),$lt:new Date("2019-07-26")}}
,callback
);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...
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...
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 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: { ...
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}, ...
my mongodb is a MMAPv1 engine, how to view and set lock granularity? ...
the model is designed as follows const RegistrationSheet = mongoose.model( RegistrationSheet , new Schema({ doctorId: String, today: { time: String, date: { morning: [ { number:Number, patient: ...
the local startup project reported an error, the same code configuration, but there is no problem with others. solve the reason, { "exception ": "com.mongodb.MongoSocketWriteException: Exception sending messagerntat com.mongodb.connection.Interna...
The structure is shown in the figure. Steps is an array. Now you want to modify the count value of a specified date. ...
Room schema var Room = new Schema({ title: String, author: String, body: String, owners: [ { type: ObjectId, ref: User , index: true } ] }) Room.find({ owners: user }) first question: why can the query here be written this way? How...
after mongodb has designed the schema, it has been running normally for some time (data is already available). When you adjust the schema later, for example, to add a field and decrease a field, what to do with the original data? do you have to wash the ...
const userSchema = new Schema({ name:{type:String}, clubnumber:{type:String}, memo:[{ memos:{type:String} }] }) the data structure is as above. Now you want to match name and clubnumber, to query all the memo under the library db.userModel....
const Article = new Schema({ Title: { type: String, required: true }, Content: { type: String, required: true }, CreatedAt: { type: Date, default: new Date, get: v => moment(v).format( YYYY-MM-DD HH:mm )}, UpdatedAt: { type: Date, d...
problem description there is a shopping cart cartList field under the user table. The field type is as follows: cartList: [ { shopId: { type: Schema.ObjectId }, shopName: String, goodsList: [ ...
Environment: Mongodb 3.6.3 mongoose: 5.2.5 nodeJS: 8.x description: simulate the blog system. There are two collection (articles comments), schema as follows Query for comment Params: { offset limit sortBy } exports.getComment...
when you associate with mysql, you can use id to associate, and you can store two tables during the same database operation. Because the primary key id can be self-increasing and is not affected by other factors, the two tables can be associated with id,...
problem description for example, take the World Foreign language School as an example. When you use mongoose s $regex for fuzzy matching, you can match when you enter keywords such as the world and foreign languages, but when you enter keywords that ...
topic description the following is a set of built replicas, where 12 nodes are arbitration nodes 192.168.1.10 br 27017 192.168.1.11 purl 27017 192.168.1.12 purl 27017 replica set set is: sss nodejs uses mongoose middleware to connect to mongodb...
[ { _id:001 ... arrs:[{name: a ,score:10}, {name: b ,score:11}, {name: c ,score:12}, {name: d ,score:13} ] } { _id:002 ... arrs:[{name: a ,score:11}, {name: b ,score:12}, {name: c ,score:13}, {name: ...
koa connects to mongodb database time error Unexpected token import, has been introduced into babel server.js const db = require( . mongodb db ); const Koa = require( koa ); const webpack = require( webpack ); const merge = require( webpack-m...