How to Firebase retrieve data below UID and auto ID In Swift - swift

Question

[enter image description here][1]I'm trying to retrieve specific data from Database. I'd like to read all data in product_list
My Database
This is what i try but when i print listName. It show like this 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
}
It have 4 things i want to retrieve
(details, name, price and product_image_url)

Answer 1

Right now your code is looping over the child nodes of /Users/Sellers, which is the nodes of each individual user. What you seem to want to do is include all nodes under the product_list property of each user, which requires an extra nested loop:
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()
}
})