在 ChildByAutoId 下从 Firebase 检索数据并添加到数组 - Xcode - Swift

Question

这是我来自 Firebase 的数据库：

我试图在“Tgb9MyxTfdTRd9tQhInsjNRXoPL2”下获取所有购买和数量的数据并添加到数组中。

这是我的代码：

    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)
    }
}

这是print("dict-->", dict)的打印输出：

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

这是print("purchase-->", purchase)的打印输出：

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

值 dict 包含我需要的数据，但我无法通过它将数据放入数组中以显示它？

如何将采购和数量数据放入他们自己的数组中？

请帮忙！

Answer 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)
        }
    }

}