CODEWITHSUNDEEP
swiftfirebasefirebase-realtime-database
PlanB
PlanB

Reputation: 37

Swift Firebase - trying to retrieve more than one set of data in a function to count the number of entries

I have a problem trying to retrieve two sets of data from Firebase, in one function. The results from this retrieve will be used to update a progress bar, after the retrieve (otherwise 'zero' values) so this 'progress bar' function is also included in the Firebase function. To clarify further, I am trying to get the count of entries for 'user-posts', and 'user-plans' from the Firebase Db:- enter image description here

enter image description here

The code for the function looks like this (and then I'll let you know what the issue is!):-

func firebaseRetrieve() {

    guard let uid = Auth.auth().currentUser?.uid else {return}

    let planRef = DB_BASE.child("user-plan").child(uid)
    planRef.observeSingleEvent(of: .value, with: { (snapshot) in
        for child in snapshot.children {
            let snap = child as! DataSnapshot
            let key = snap.key
            self.totalPlans.append(key)
            self.planCount = Double(self.totalPlans.count)

            let postRef = DB_BASE.child("user-posts").child(uid)
            postRef.observeSingleEvent(of: .value, with: { (snapshot) in
                for child in snapshot.children {
                    let snaps = child as! DataSnapshot
                    let keys = snaps.key
                    self.totalPosts.append(keys)
                    self.postCount = Double(self.totalPosts.count)

                    self.fraction = self.postCount / self.planCount

                    //THIS IS WHERE I INPUT ANOTHER FUNCTION TO PASS THE VALUE OF 'FRACTION' INTO, THAT THNE DETERMINES THE PROGRESS BAR
                }
            })
        }
    })

THE ISSUE: The current count of 'user-plan' is 18. The current count of 'user-posts' is 14. So the fraction should equal 0.77 (78%). But, the count of 'user-posts' seems to be reiterated 18 times, so the count is 252 (i.e. 14 * 18)!! I've tried all sorts to fix it over the past 3 days, but always the same result. Any ideas greatly received, and will stop me swearing at the wife......

Upvotes: 1

Views: 70

Answers (1)

Ali Faris
Ali Faris

Reputation: 18592

you can use snapshot.childrenCount to get the count of the snapshot children , and you need to move your calculation for fraction outside the loop

checkout this code

func firebaseRetrieve() 
{

    guard let uid = Auth.auth().currentUser?.uid else {return}

    let planRef = DB_BASE.child("user-plan").child(uid)
    planRef.observeSingleEvent(of: .value, with: 
    { 
        (snapshot) in

        self.planCount = snapshot.childrenCount;
        for child in snapshot.children 
        {
            let snap = child as! DataSnapshot
            let key = snap.key
            self.totalPlans.append(key)
        }


        let postRef = DB_BASE.child("user-posts").child(uid)
        postRef.observeSingleEvent(of: .value, with: 
        { 
            (snapshot) in

            self.postCount = snapshot.childrenCount;
            for child in snapshot.children 
            {
                let snaps = child as! DataSnapshot
                let keys = snaps.key
                self.totalPosts.append(keys)
            }

            self.fraction = self.postCount / self.planCount;
            print("fraction = \(self.fraction)")

        })

    });

}

Upvotes: 1

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