How to parse multiple objects in firebase

Question

i have a database in Firebase look like:

and two objects:

class Area: NSObject {
let itemRef:FIRDatabaseReference?
var id:String?
var name:String?
var cities : [City] = []
var collapsed: Bool
}

and

class City: NSObject {
var id:String?
var name:String?
init(_ id:String,_ name: String) {
    self.id = id
    self.name = name
}

override init(){

}

and this is my parsing code :

func makeData(){
    let ref = FIRDatabase.database().reference().child("area")
    ref.observe(.childAdded, with: {
        (snapshot) in
        if let dictionary = snapshot.value as? [String:AnyObject]{
            print(dictionary)
        }
    })
}

I try to parse the data in snapshot to my array Area but i cannot how i can do it?

You code refers to a child arena, but your JSON doesn't show such a child. Please replace the screenshot of the JSON with the actual text of the JSON and include the node that is referenced in the code. You can get the JSON as text by clicking the "Export JSON" link in your Firebase Database console. — Frank van Puffelen
– Frank van Puffelen, Commented Jul 30, 2017 at 2:01

Pipiks · Accepted Answer · 2017-07-30 15:40:28Z

2

You need something like that :

(It's just an example, you need to adapt this for your case)

let ref = FIRDatabase.database().reference().child("area")

ref.observe(.childAdded, with: { (snapshot) in
    guard let dictionary = snapshot.value as? [String: Any] else {
        return
    }

    // Create the area object
    let area = Area()

    // Add id in the area
    area.id = snapshot.key

    // Init cities
    area.cities = [City]()

    if let cities = dictionary["cities"] as? [String: Any] {
        for (key, value) in cities {
            guard let cityName = value["name"] as? String else {
                continue
            }

            // Create the city object
            let city = City(key, cityName)

            // Add city to cities in the area
            area.cities.append(city)
        }
    }

    if let name = dictionary["name"] as? String {
        // Add name in the area
        area.name = name
    }

    // Use the area
})

edited Jul 30, 2017 at 15:40

answered Jul 30, 2017 at 9:41

Pipiks

2,04813 silver badges27 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Evan Ngo Over a year ago

Thank for your answer but error in this line let city = City(key, value as! String) with error Could not cast value of type '__NSDictionaryM' (0x101ffd2b0) to 'NSString' (0x103280c60).

Pipiks Over a year ago

Try City(key, value["name"] as! String)

Evan Ngo Over a year ago

it's work perfect, thank you very much, you are my hero. but i have to change [String: Any] to [Strinng:AnyObjects]

Collectives™ on Stack Overflow

How to parse multiple objects in firebase

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related