How does Query.prototype.and() work in Mongoose ?
The Query.prototype.and() specifies arguments for a $and condition. The array parameter contains all the conditions that has to be matched.
Syntax:
Query.prototype.and()
Parameters: This function has one array parameter i.e. an array of conditions.
Return Value: This function returns Query Object.
Installing mongoose :
npm install mongoose
After installing the mongoose module, you can check your mongoose version in command prompt using the command.
npm mongoose --version
After that, you can just create a folder and add a file for example, index.js as shown below.
Database: The sample database used here is shown below:
Example 1:
index.js
const mongoose = require( 'mongoose' ); // Database connection mongoose.connect( 'mongodb://127.0.0.1:27017/w3wiki' , { useNewUrlParser: true , useCreateIndex: true , useUnifiedTopology: true }); // User model const User = mongoose.model( 'User' , { name: { type: String }, age: { type: Number } }); const query = User.find(); query.collection(User.collection); query.and([{ name: 'Gourav' }, { age: 10 }]) .exec( function (error, result) { if (error) { console.log(error) } else { console.log(result) } }); |
The project structure will look like this:
Run index.js file using below command:
node index.js
Output:
[ { _id: 5ebb9129a99bde77b2efb809, name: ‘Gourav’, age: 10, __v: 0 } ]
Example 2:
index.js
const express = require( 'express' ); const mongoose = require( 'mongoose' ); const app = express() // Database connection mongoose.connect( 'mongodb://127.0.0.1:27017/w3wiki' , { useNewUrlParser: true , useCreateIndex: true , useUnifiedTopology: true }); // User model const User = mongoose.model( 'User' , { name: { type: String }, age: { type: Number } }); const query = User.find(); query.collection(User.collection); query.and([{ name: 'Lalit' }, { age: 25 }]) .exec( function (error, result) { if (error) { console.log(error) } else { console.log(result) } }); app.listen(3000, function (error ){ if (error) console.log(error) console.log( "Server listening on PORT 3000" ) }) |
The project structure will look like this:
Run index.js file using below command:
node index.js
Output:
Server listening on PORT 3000
[ { _id: 5ebc3669a99bde77b2efb9ba, name: ‘Lalit’, age: 25, __v: 0 } ]
Reference:https://mongoosejs.com/docs/api/query.html#query_Query-and
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