Retrieving Data from Firebase under ChildByAutoId and adding to array - Xcode - Swift

Question

Here is my Database from Firebase:

Im trying to get the data for all purchases and quantities under "Tgb9MyxTfdTRd9tQhInsjNRXoPL2" and add to an array.

Here is my code:

    func fetchPurchase(withUID uid: String, completion: @escaping (Purchase) -> ()) {
        Database.database().reference().child("purchases").child(uid).observeSingleEvent(of: .value, with: { (snapshot) in


        guard let dict = snapshot.value as? [String: Any] else { return }
            print("dict-->", dict)
        let purchase = Purchase(uid: uid, dictionary: dict)
            print("purchase-->", purchase)
        completion(purchase)
    }) { (err) in
        print("Failed to fetch purchase from database:", err)
    }
}

This is the print out for print("dict-->", dict):

dict--> ["-LzjaFBgD3ATl7e8uR2-": {
purchase = "Z2lkOi8vc2hvcGlmeS9Qcm9kdWN0Lzk4OTUzMjEyODM=";
quantity = 1;
}, "-LzjaFBiAmrj4m3ZS8m4": {
purchase = "Z2lkOi8vc2hvcGlmeS9Qcm9kdWN0Lzk4OTUzMDk2OTk=";
quantity = 2;
}]

This is the print out for print("purchase-->", purchase):

 purchase--> Purchase(uid: "Tgb9MyxTfdTRd9tQhInsjNRXoPL2", purchases: "", quantities: "")

The value dict holds the data I need, but I cant get past that to put the data into an array to display it?

How can I get the purchase and quantity data into their own arrays?

Please help!

Chetan Hedamba · Accepted Answer · 2020-01-30 04:03:54Z

1

    func fetchPurchase(withUID uid: String, completion: @escaping (Purchase) -> ()) {
            Database.database().reference().child("purchases").child(uid).observeSingleEvent(of: .value, with: { (snapshot) in

            if snapshot.childrenCount > 0 {
                self.YourArrayList.removeAll()
                 for dict in snapshot.children.allObjects as! [DataSnapshot]
                    let purchase = Purchase(uid: uid, dictionary: dict)
                    self.YourArrayList.append(purchase)
                }

            }
            completion(purchase)
        }) { (err) in
            print("Failed to fetch purchase from database:", err)
        }
    }

}

edited Jan 30, 2020 at 4:03

answered Jan 29, 2020 at 9:17

Chetan Hedamba

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2 Comments

Dan.code Over a year ago

where is the i inside the for loop?

Jay Over a year ago

Not a big issue but you've cast all of the snapshot child nodes to[DataSnapshot] (which is spot on) but your loop var is called dict which is a little misleading as it looks like the Purchase object is expecting a Dictionary, not a DataSnapshot. Probably should call it childSnap or snap for clarity or cast it to a dict [String: Any]. Other than that, great answer.

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