The Query.prototype.centerSphere() function defines a circle for a geospatial query that uses spherical geometry. It returns the all the documents which are within the bounds of the circle.
Syntax:
Query.prototype.centerSphere()
Parameters: This function has one value 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
Now, create a folder and add a file for example, index.js as shown below.
Example 1:
const mongoose = require( 'mongoose' );
// Database connection useNewUrlParser: true ,
useCreateIndex: true ,
useUnifiedTopology: true
}); // User model const User = mongoose.model( 'User' , {
name: { type: String },
age: { type: Number }
}); var query = User.find();
var area = { center: [20, 20], radius: 5, unique: true }
query.where( 'loc' ).within().centerSphere(area)
console.log(query._conditions.loc.$geoWithin) |
- The project structure will look like this:
node index.js
Output :
{ '$centerSphere': [ [ 20, 20 ], 5 ], '$uniqueDocs': true }
Example 2:
const express = require( 'express' );
const mongoose = require( 'mongoose' );
const app = express() // Database connection useNewUrlParser: true ,
useCreateIndex: true ,
useUnifiedTopology: true
}); // User model const User = mongoose.model( 'User' , {
name: { type: String },
age: { type: Number }
}); var query = User.find();
var area = { center: [10, 10], radius: 50, unique: true }
query.where( 'loc' ).within().centerSphere(area)
console.log(query._conditions.loc.$geoWithin) app.listen(3000, function (error ) {
if (error) console.log(error)
console.log( "Server listening on PORT 3000" )
}); |
- The project structure will look like this:
node index.js
Output :
Server listening on PORT 3000 { '$centerSphere': [ [ 10, 10 ], 50 ], '$uniqueDocs': true }
Reference:https://mongoosejs.com/docs/api/query.html#query_Query-centerSphere