如何在 Swift 中 Firebase 检索 UID 和自动 ID 以下的数据

Question

[在此处输入图像描述][1]我正在尝试从数据库中检索特定数据。我想读取product_list中的所有数据

我的数据库

这是我尝试的，但是当我打印 listName 时。它显示像这样 listName = nil

 let refList = Database.database().reference().child("Users/Sellers")
        refList.observe(DataEventType.value, with:{(snapshot) in
            if snapshot.childrenCount>0{
                self.listProduct.removeAll()

                for lists in snapshot.children.allObjects as! [DataSnapshot]{
                    let userList = lists.value as? [String: AnyObject]
                    let listName = userList?["name"]
                    let listDetail = userList?["detail"]
                    let listPrice = userList?["price"]
                    print("key = \(listName)")

                    let list = ListModel(name: listName as! String?, detail: listDetail as! String?, price: listPrice as! String?)

                    self.listProduct.append(list)
                }
                self.tableList.reloadData()
            }

        })

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ViewControllerTableViewCell

        let list: ListModel
        list = listProduct[indexPath.row]

        cell.lblName.text = list.name
        cell.lblDetail.text = list.detail
        cell.lblPrice.text = list.price

        return cell
    }

它有 4 个我想要检索的东西

（详细信息、名称、价格和 product_image_url）

Answer 1

现在您的代码正在循环/Users/Sellers 的子节点，这是每个用户的节点。您似乎想要做的是在每个用户的 product_list 属性下包含所有节点，这需要一个额外的嵌套循环：

let refList = Database.database().reference().child("Users/Sellers")

refList.observe(DataEventType.value, with:{(snapshot) in
    if snapshot.childrenCount>0{
        self.listProduct.removeAll()

        for user in snapshot.children.allObjects as! [DataSnapshot]{
            let productList = user.childSnapshot(forPath: "product_list")
            for product in productList.children.allObjects as! [DataSnapshot]{
              let userList = product.value as? [String: AnyObject]
              let listName = userList?["name"]
              let listDetail = userList?["details"] // NOTE: also fixed a typo here
              let listPrice = userList?["price"]
              print("key = \(listName)")

              let list = ListModel(name: listName as! String?, detail: listDetail as! String?, price: listPrice as! String?)

              self.listProduct.append(list)

            }
        }
        self.tableList.reloadData()
    }

})