Firestore get array data at index 0

Question

Below I have some data in firestore.

I have a an array in the _geoloc field. Each of those indexes have latitude and longitude coordinates. So using SWIFT I want to be able to only get the lat and lng coordinates at index 0 and pass them to individually to a string. I have been researching for days and I am stuck. I have tried to create a new array of strings or an AnyObject array and I just get stuck with retrieving the data I need at index 0, and passing only those 2 lat/lng coordinates to string values. I have several failed snippets of code I could post.

Here is a snippet of what I was attempting to do: (I am really new to firebase so the code is a bit ugly as I am just trying to figure this out)

        Firestore.firestore().collection("users").document("626").getDocument { (document, error) in
        if let document = document {
//            let geo_array = document["_geoloc"]

            var yourArray = [String]()
           // let geo_location = [geo_array] as [AnyObject]
            let array: [Any] =  document["_geoloc"] as! [Any]
            let tmpArray = array.map({ return String(describing: $0)})
            let string = tmpArray.joined(separator: ",")
           yourArray.append(string)

            print(yourArray[0])

Leo Dabus · Accepted Answer · 2020-01-12 00:21:41Z

3

You just need to cast your object from Any to an array of dictionaries and get the first property:

Firestore.firestore().collection("users").document("626").getDocument { document, error in
    if let document = document {
        var yourArray: [String] = []    
        if let location = (document["_geoloc"] as? [[String:Double]])?.first,
            let latitude = location["lat"],
            let longitude = location["lon"] {
            let coordinate2d = CLLocationCoordinate2D(latitude: latitude, longitude: longitude) 
            yourArray.append("Latitude: \(location.latitude), Longitude: \(location.Longitude)")
        }
    }
}

edited Jan 12, 2020 at 0:21

answered Mar 8, 2019 at 21:15

Leo Dabus

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3 Comments

GhostShaman Over a year ago

Oh, I see, I was declaring my array wrong. This answers my question and I will mark it, but as a follow up, if I wanted to get the second, third, or even 10th index, what would be the right syntax for that? [[String:Double]])?[2] is not correct.

Leo Dabus Over a year ago

Just remove the first property you will have an array of dictionaries. You can map them as needed. Right now I am on my mobile but I will edit the post once I get a chance.

GhostShaman Over a year ago

I figured it out, I was referencing the index at the wrong spot. if let location = (document["_geoloc"] as? [[String:Double]]), let latitude = location[1]["lat"] { Appreciate the help @leo-dabus, apparently I need to hit the swift books and get better educated on arrays.

Peter Ruppert · Accepted Answer · 2019-03-08 21:15:28Z

0

Maybe first declare this:

  var firstPositionValues = [AnyObject]()

Then get it like this:

let db = Firestore.firestore().collection("users").document("626")

 db.getDocument { (document, error) in
        if let document = document {

            let geo_location = document["_geoloc"] as [AnyObject] // <- this is all of them in the document
            var initialValues = geo_location[0] // <- here are your lat and lng at position 0
             self.firstPositionValues = initialValues

        }

Hope I understood correctly good luck.

answered Mar 8, 2019 at 21:15

Peter Ruppert

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