CODEWITHSUNDEEP
javascriptnode.jsmongodbobjectmeteor
tomwassing
tomwassing

Reputation: 961

Cannot acces object properties. Returns undefined (Meteor)

I am trying to get the latitude and longitude from a object. Why is it returning Undefined?. I am using .find() beacuse of this: https://blog.serverdensity.com/checking-if-a-document-exists-mongodb-slow-findone-vs-find/

var LatLngs = Shops.find({_id:template.data._id}, {fields: {latitude: 1, longitude: 1}, limit:1}).fetch();

console.log(LatLngs);

Console:

[Object]
0: Object_id: "vNHYrJxDXZm9b2osK"
latitude: "xx.x50785"
longitude: "x.xx4702"
__proto__: 
Objectlength: 1
__proto__: Array[0]

try 2:

var LatLngs = Shops.find({_id:template.data._id}, {fields: {latitude: 1, longitude: 1}, limit:1}).fetch();

console.log(LatLngs.longitude);

Console:

undefined

Upvotes: 1

Views: 226

Answers (2)

David Weldon
David Weldon

Reputation: 64342

fetch returns an array. In your first example you'd need to do something like this:

// fetch an array of shops
var shops = Shops.find(...).fetch();
// get the first shop
var shop = shops[0];
// if the shop actually exsists
if (shop) {
  // do something with one of its properies
  console.log(shop.latitude);
}

The linked article doesn't apply in this case - you are not testing if it exists, you are actually fetching it and reading its contents.

Use findOne instead:

// get a matching shop
var shop = Shops.findOne(...);
// if the shop actually exsists
if (shop) {
  // do something with one of its properies
  console.log(shop.latitude);
}

Upvotes: 1

saimeunt
saimeunt

Reputation: 22696

The fetch method of Mongo cursors returns an array, so you have to access the longitude of the first item in the array : LatLngs[0].longitude.

Moreover, you're working on the client, thus using MiniMongo, a browser reimplementation of the Mongo query language : you can't make the same assumptions on how findOne will perform versus find because it's not the same implementation as regular server-side MongoDB engine.

Just use findOne, it has been specifically designed for your use case.

Upvotes: 1

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