How does Query.prototype.box() work in Mongoose ?
The Query.prototype.box() is used to specify a $box condition. When this function is used, the $geoWithin returns documents based on the grid coordinates.
Syntax:
Query.prototype.box()
Parameters: This function has one array object parameter which has upper-left co0rdinates and upper-right coordinates.
Return Value: This function returns Query Object.
Installing mongoose :
npm install mongoose
After installing the mongoose module, you can check your mongoose version in command prompt using the command.
npm mongoose --version
After that, you can just create a folder and add a file for example, index.js as shown below.
Example 1:
index.js
const mongoose = require( 'mongoose' ); // Database connection mongoose.connect( 'mongodb://127.0.0.1:27017/w3wiki' , { useNewUrlParser: true , useCreateIndex: true , useUnifiedTopology: true }); // User model const User = mongoose.model( 'User' , { name: { type: String }, age: { type: Number } }); const query = User.find(); var lower_left = [23, -71] var upper_right= [12, 11] query.where( 'loc' ).within().box(lower_left, upper_right) query.box({ ll : lower_left, ur : upper_right}) console.log( "Geo Location within: " , query._conditions.loc.$geoWithin) |
The project structure will look like this:
Run index.js file using below command:
node index.js
Output:
Geo Location within: { '$box': [ [ 23, -71 ], [ 12, 11 ] ] }
Example 2:
index.js
const express = require( 'express' ); const mongoose = require( 'mongoose' ); const app = express() // Database connection mongoose.connect( 'mongodb://127.0.0.1:27017/w3wiki' , { useNewUrlParser: true , useCreateIndex: true , useUnifiedTopology: true }); // User model const User = mongoose.model( 'User' , { name: { type: String }, age: { type: Number } }); const query = User.find(); var lower_left = [21, -33] var upper_right= [-6, 32] query.where( 'loc' ).within().box(lower_left, upper_right) query.box({ ll : lower_left, ur : upper_right}) console.log( "Geo Location is: " , query._conditions.loc.$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:
Run index.js file using below command:
node index.js
Output:
Server listening on PORT 3000 Geo Location is: { '$box': [ [ 21, -33 ], [ -6, 32 ] ] }
Reference: https://mongoosejs.com/docs/api/query.html#query_Query-box
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