Adding and Retrieving multiple values with Firebase under "User"

Question

Im uploading my data like this:

By using these function:

extension Database {

func createPurchase (purchaseID : String, quantity: String, completion: @escaping (Error?) -> ()){

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

    let userPostRef = Database.database().reference().child("purchases").child(uid) //taken off auto ID
    let values = ["purchase" : purchaseID, "quantity" : quantity ] as [String: Any]

                    userPostRef.updateChildValues(values) { (err, ref) in
            if let err = err {
                print("Failed to save purchase to database", err)
                completion(err)
                return
            }
            completion(nil)
        }
    }

}

.

In Viewcontroller 1:

func callID (){
    let itemCount = CartController.shared.items.count

    for i in 0...itemCount-1 {

        let quantity = CartController.shared.items[i].quantity
        let quantity1 = String(quantity)
        let item = CartController.shared.items[i].product.id

        Database.database().createPurchase(purchaseID: item, quantity: quantity1 ) { (err) in
            if err != nil {
                print("error uploading purchase to Firebase ")
                return
            }
        }
    }
}

callID uses createPurchase to take the sku number of each product and its quantity and uploads to firebase. However, it overrides what was previously uploaded. So when I load more than 1 product. It only leaves the last products sku and quantity. For this example, I started with 3 product, but only 1 (the last one) got uploaded. How can I upload all the data. i.e stop this overide?

Here is how Im retrieving it:

extension Database {
    func fetchPurchase(withUID uid: String, completion: @escaping (Purchase) -> ()) {
        Database.database().reference().child("purchases").child(uid).observeSingleEvent(of: .value, with: { (snapshot) in
            guard let userDictionary = snapshot.value as? [String: Any] else { return }

            let purchase = Purchase(uid: uid, dictionary: userDictionary)
            completion(purchase)
        }) { (err) in
            print("Failed to fetch purchase from database:", err)
        }
    }
}

.

In viewcontroller 2:

struct Purchase {

    let uid: String
    let purchases: String
    let quantities: String


    init(uid: String, dictionary: [String: Any]) {
        self.uid = uid
        self.purchases = dictionary["purchase"] as? String ?? ""
        self.quantities = dictionary["quantity"] as? String ?? ""

    }
}

var myPurchases: [Purchase] = []

private func fetchPurchaseForCurrentUser() {
    guard let currentLoggedInUserId = Auth.auth().currentUser?.uid else { return }
    Database.database().fetchPurchase(withUID: currentLoggedInUserId, completion: { (purchases) in
        self.myPurchases.append(purchases)
        print("myPurchases", self.myPurchases)
    })
}

This is the printout I get:

myPurchases [myShop.Purchase(uid: "Tgb9MyxTfdTRd9tQhInsjNRXoPL2", purchases: "Z2lkOi8vc2hvcGlmeS9Qcm9kdWN0Lzk4OTUzMDk2OTk=", quantities: "2")]

This only shows the one product, however Im needing to have multiple products.

Please Help!

EDIT:

This is a screenshot of when I use ChildByAutoId(). I get all products (2 in this case). But I am unable to retrieve the information from the snapshot and set to my text fields?

You need all purchases or do you want to filter it with some value? — Mohit Kumar
– Mohit Kumar, Commented Jan 29, 2020 at 4:00
Because Database.database().reference().child("purchases").child(uid) this will return you only one value. And if you can more purchases in the screenshot that will be helpful. — Mohit Kumar
– Mohit Kumar, Commented Jan 29, 2020 at 4:01
I can only store one value of purchases, but I want to store more. If I use ChildAutoId, then I can store them all. However I can retrieve them all? — Dan.code
– Dan.code, Commented Jan 29, 2020 at 4:14
If you want to get all values use "Database.database().reference().child("purchases")" with single value observer — Mohit Kumar
– Mohit Kumar, Commented Jan 29, 2020 at 4:18

Mohit Kumar · Accepted Answer · 2020-01-29 05:42:09Z

1

Prepare an array from multiple records, sample code:

var myPurchases: [Purchase] = []
for (key, value) in userDictionary {
    guard let dic = value as? [String: Any] else {
         continue
    }

    let purchaseModel = Purchase(uid: key, dictionary: dic)
    myPurchases.append(purchaseModel)
}

edited Jan 29, 2020 at 5:42

answered Jan 29, 2020 at 5:24

Mohit Kumar

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3 Comments

Dan.code Over a year ago

cant recognise json.dictionaryObject

Dan.code Over a year ago

Do I put this in the func fetchPurchaseForCurrentUser()? I dont have userDictionary in the view controller Im trying to get the data to

Mohit Kumar Over a year ago

You will get userDictionary in fetchPurchaseForCurrentUser via let userDictionary = purchases[uid] and then you can use the above code to add values to your purchase model.

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