How does Query.prototype.gt() work in Mongoose?
The Query.prototype.gt() function is used to specify a $gt query condition. It returns documents that are greater than the specified condition.
Syntax:
Query.prototype.gt()
Parameters: This function has one val parameter and an optional path parameter.
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:
Project Structure: The project structure will look like this:
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 } }); var query = User.find() query.where( 'age' ).gt(25).exec( function (err, res){ if (err) console.log(err.message) else console.log(res) }); |
Run index.js file using below command:
node index.js
Output:
[ { _id: 5ebd345f5d2d8a3534b2f391, name: 'Manish', age: 34, __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 } }); var query = User.find() query.where( 'age' ).gt(10).exec( function (err, res){ if (err) console.log(err.message) else console.log(res) }); app.listen(3000, function (error ) { if (error) console.log(error) console.log( "Server listening on PORT 3000" ) }); |
Run index.js file using below command:
node index.js
Output:
Server listening on PORT 3000 [ { _id: 5ebc3669a99bde77b2efb9ba, name: 'Lalit', age: 25, __v: 0 }, { _id: 5ebd345f5d2d8a3534b2f391, name: 'Manish', age: 34, __v: 0 } ]
Reference:
https://mongoosejs.com/docs/api/query.html#query_Query-gt
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