Unable to retrieve data from JSON in Firebase Database Swift

Question

I took a risk to use Firebase for my final project. I am not able to retrieve my data from Firebase Database. I have no idea where I'm wrong. Please enlighten me.

Main file:

var ref: FIRDatabaseReference!
let user = FIRAuth.auth()?.currentUser

@IBOutlet var placename: UILabel!
@IBOutlet var placetype: UILabel!

var SiasuObj = [siasuObj]()
var PlaceObj = [placeObj]()

var planPriceLevel = ""

override func viewDidLoad() {
    super.viewDidLoad()

    fetchData()

    findPlaceToEat()
}

func fetchData(){

    //var planPriceLevel = ""
    ref = FIRDatabase.database().reference()

    //I can't pass through this part

ref.child("ios_entry").child(user!.uid).child("Budget").observeEventType(.ChildAdded, withBlock: {
        (snapshot) in

        if let dictionary = snapshot.value as? [String: AnyObject]{
            let SiasuObj = siasuObj()
            SiasuObj.setValuesForKeysWithDictionary(dictionary)
            self.SiasuObj.append(SiasuObj)
            print("Total budget")
            print(SiasuObj.total_budget, SiasuObj.total_day, SiasuObj.total_pax)
            SiasuObj.total_budget = dictionary ["total_budget"] as! String
            SiasuObj.total_day = dictionary["total_day"] as! String
            SiasuObj.total_pax = dictionary["total_pax"] as! String

            let  total_budget:Int32? = Int32(SiasuObj.total_budget);
            print(total_budget)
            let total_day:Int32? = Int32(SiasuObj.total_day);
            print(total_day)
            let total_pax:Int32? = Int32(SiasuObj.total_pax);
            print(total_pax)

            let budgetPerPax = (total_budget! / total_pax!) / (total_day! * 3);

            if(budgetPerPax < 50){
                self.planPriceLevel = "1";
                self.findPlaceToEat();
            }else if(budgetPerPax <= 150){
                self.planPriceLevel = "2";
                self.findPlaceToEat();
            }else if(budgetPerPax > 150){
                self.planPriceLevel = "3";
                self.findPlaceToEat();
            }
        }

        }, withCancelBlock: nil)
}

func findPlaceToEat(){
    print("inside findPlaceToEat()")

    print("Plan price level")
    print(planPriceLevel)
    //let pricelevel = String(planPriceLevel)
   // print("pricelevel")
    //print(pricelevel)

    ref.child("places_detail").child("price_level").child(planPriceLevel).childByAutoId().observeEventType(.ChildAdded, withBlock:{
        (snapshot) in
        if let dictionary = snapshot.value as? [String: AnyObject]{
            let PlaceObj = placeObj()
            //placeObj.setValuesForKeysWithDictionary(dictionary)

            //self.PlaceObj.append(PlaceObj)
            print("Whatever")
            print(PlaceObj.place_name, PlaceObj.place_type)
            PlaceObj.place_name = dictionary["place_name"] as! String
            PlaceObj.place_type = dictionary["place_type"] as! String
            PlaceObj.price_range = dictionary["price_range"] as! String
            PlaceObj.vegan_type = dictionary["vegan_type"] as! String
            PlaceObj.website = dictionary["website"] as! String



            self.placename.text = PlaceObj.place_name;


        }
    }, withCancelBlock: nil)
}

Class file:

class placeObj: NSObject {

var place_name : String!
var place_type : String!
var price_range : String!
var vegan_type : String!
var website : String!
}

Answer 1

Instead of using .observeEventType(.ChildAdded), use .value as it child added will only fetch data when new entry has been added to firebase.

To read data at a path and listen for changes, use the observeEventType:withBlock or observeSingleEventOfType:withBlock methods of FIRDatabaseReference to observe FIRDataEventTypeValue events.

FIRDataEventTypeValue: Read and listen for changes to the entire contents of a path.

Firebase documentation says: You can use the FIRDataEventTypeValue event to read the data at a given path, as it exists at the time of the event. This method is triggered once when the listener is attached and again every time the data, including any children, changes. The event callback is passed a snapshot containing all data at that location, including child data. If there is no data, the value of the snapshot returned is nil.

Answer 2

Change this line

ref.child("places_detail").child("price_level").child(planPriceLevel).childByAutoId().observeEventType(.ChildAdded, withBlock:{
    (snapshot) in

to this:

ref.child("places_detail").child("price_level").child(planPriceLevel).childByAutoId().observeEventType(.Value, withBlock:{
    (snapshot) in

ObserveEvent type is .ChildAdded only gives you information when new child is added. That's why use .Value

One more important thing to check is reference URL. Check you have correct base URL in Google-Info.plist or not