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POUsing find() with geospatial coordinates in Mongoose (NodeJS+MongoDB)
 

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  1. POUsing find() with geospatial coordinates in Mongoose (NodeJS+MongoDB)
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    <p>Mongoose version: 3.6 Node version: 0.10</p> <p>I have been trying to solve this problem for hours. I want to find all the documents closer than maxDistance to some coordinates. I am trying to use the GeoJSON specifications of MongoDB (2dsphere), so that I can input the distance in meters. </p> <p>This is my schema "venue.js":</p> <pre><code>var db = require('mongoose'), Schema = db.Schema, ObjectId = Schema.ObjectId; var venueSchema = new Schema({ geo: { type: [Number], index: '2dsphere'}, city: String, name: String, address: String }); module.exports = db.model('Venue', venueSchema); </code></pre> <p>This is where I insert the query ctrlVenue.js:</p> <pre><code>var Venue = require('../models/venue.js'); VenueController = function(){}; /** GET venues list ordered by the distance from a "geo" parameter. Endpoint: /venues Params: - geo: center for the list of venues - longitude, latitude (default: 25.466667,65.016667 - Oulu); - maxDistance: maxímum distance from the center for the list of venues (default: 0.09) **/ exports.getVenues =function(req, res) { var maxDistance = typeof req.params.maxDistance !== 'undefined' ? req.params.maxDistance : 0.09; //TODO: validate var geo = typeof req.params.geo !== 'undefined' ? req.params.geo.split(',') : new Array(25.466667, 65.016667); //TODO: validate var lonLat = { $geometry : { type : "Point" , coordinates : geo } }; Venue.find({ geo: { $near: lonLat, $maxDistance: maxDistance }}).exec(function(err,venues){ if (err) res.send(500, 'Error #101: '+err); else res.send(venues); }); } </code></pre> <p>When I run the code I receive the error:</p> <blockquote> <p>"Error #101: CastError: Cast to number failed for value \"[object Object]\" at path \"geo\""</p> </blockquote> <p>If I instead modify this line:</p> <pre><code>$near: lonLat, </code></pre> <p>with</p> <pre><code>$near: geo, </code></pre> <p>I correctly get the documents, but then, I cannot use meters as unit of measure. I based my assumptions on the following table: <a href="http://docs.mongodb.org/manual/reference/operator/query-geospatial/">http://docs.mongodb.org/manual/reference/operator/query-geospatial/</a></p> <p>I have seen plenty of functioning examples using <em>$geometry</em> but none together with <em>$near</em>. What am I doing wrong? </p>
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    1. COHmm, your query is build up correctly, but I am not sure why mongoose is throwing a fit!
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    2. CO@Derick that's what I thought. And this kind of use looks to me so basic that I would be very surprised if I were the only one going through it...
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