How does Query.prototype.geometry() works in Mongoose ?
The Query.prototype.geometry() function is used to specify a $geometry condition. The geometry can be provided in an array which is passed as parameter.
Syntax:
Query.prototype.geometry()
Parameters: This function has one object parameter which must contain a type property of string type and a coordinates property of array type.
Return Value: This function returns Query Object.
Installing mongoose :
npm install mongoose
After installing the mongoose module, you can check your mongoose version in command prompt using the command.
npm mongoose --version
Database: The sample database used here is shown below.
After that, you can just create a folder and add a file for example, index.js as shown below.
Project Structure: The project structure will look like this.
Example 1:
index.js
const mongoose = require( 'mongoose' );
useNewUrlParser: true ,
useCreateIndex: true ,
useUnifiedTopology: true
});
const User = mongoose.model( 'User' , {
name: { type: String },
age: { type: Number }
});
var query = User.find()
var polyA = [[[ 11, 21 ], [ 11, 41 ], [ 31, 41 ], [ 31, 21 ]]]
query.where( 'loc' ).within()
.geometry({ type: 'Polygon' , coordinates: polyA })
console.log(query._conditions.loc)
|
Run index.js file using below command:
node index.js
Output:
{
'$geoWithin': { '$geometry': {
type: 'Polygon', coordinates: [Array] } }
}
Example 2:
index.js
const express = require( 'express' );
const mongoose = require( 'mongoose' );
const app = express()
useNewUrlParser: true ,
useCreateIndex: true ,
useUnifiedTopology: true
});
const User = mongoose.model( 'User' , {
name: { type: String },
age: { type: Number }
});
var query = User.find()
var polyA = [[[ 15, 25 ], [ 15, 45 ], [ 35, 45 ], [ 35, 25 ]]]
query.where( 'loc' ).within()
.geometry({ type: 'Polygon' , coordinates: polyA })
console.log(query._conditions.loc)
app.listen(3000, function (error ) {
if (error) console.log(error)
console.log( "Server listening on PORT 3000" )
});
|
Run index.js file using below command:
node index.js
Output:
Server listening on PORT 3000
{
'$geoWithin': { '$geometry': {
type: 'Polygon', coordinates: [Array] } }
}
Reference:
https://mongoosejs.com/docs/api/query.html#query_Query-geometry
Last Updated :
23 Jul, 2021
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