CODEWITHSUNDEEP
node.jsfirebasegeofire
Ash8087
Ash8087

Reputation: 701

Query Location by Radius with GeoFire

I know this is a basic question, but I’m having a lot of trouble with it nonetheless.

I have a Firebase database storing community events. Each event node has a geo location node (created with GeoFire) called eventPlace (see screenshot below).

Using GeoFire (and javascript), how would I query the entire database and get all events within a certain location/radius? Is this possible, given the way the data is stored? Or do I need to move all the location nodes to a common node (eventPlaces??) and query that single parent node?

Note that I am not seeking real-time data. These locations are stored previously and don’t change very often.

Thanks in advance…

enter image description here

Upvotes: 2

Views: 2319

Answers (1)

MichaelSolati
MichaelSolati

Reputation: 2872

As it stands right now geofire sort of serves as an index to make geoqueries on, and provides the key of the document you want (which would be stored in a separate "collection").

You should be using geofire and a separate "collection" (call it eventPlaces)

var firebaseRef = firebase.database().ref('eventPlaces');
var geoFire = new GeoFire(firebaseRef);

Now you can use it as an index for your events, and can add items to it like so.

geoFire.set('-K_Pp-3RBJ58VkHGsL5P', [40.607765, -73.758949]);

Your Firebase RTDB will look like this now:

{
   'events': {
        '-K_Pp-3RBJ58VkHGsL5P': {
            // All your data here
        }
    },
   'eventPlaces': {
        '-K_Pp-3RBJ58VkHGsL5P': {
            'g': 'dr5x186m7u',
            'l': [40.607765, -73.758949]
        }
    }
}

So finally when you do a query on your geoFire:

geoFire.query({
  center: [40.607765, -73.758949],
  radius: 10
}).on('key_entered', (key, location, distance) => {
  console.log(key + ' entered query at ' + location + ' (' + distance + ' km from center)');
});

You'll end up being returned the key of the doc, for which you can do a normal Firebase query for that individual doc.

Upvotes: 5

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