Can not retrieve data correctly from Firebase - ios

Question

This is my second version me trying to retrieve code from Firebase and do stuff with it. This is how I done it the second way:
channelRef?.observe(.childChanged, with: { (snapshot) -> Void in
let update = snapshot.value as! Dictionary<String, AnyObject>
var readyToGoValue: Bool?
var userID: String?
var amountOfPlayers: Int?
var changedCreator: String?
if let updatedReadyToGo = update["readyToGo"] as! Bool!{
if updatedReadyToGo == true
{
readyToGoValue = true
}
else
{
readyToGoValue = false
}
}
if let updateduserID = update["userID"] as! String!{
userID = updateduserID
}
if let updatedAmountOfPlayers = update["currentPlayers"] as! Int!{
amountOfPlayers = updatedAmountOfPlayers
}
if let updateduserID = update["userID"] as! String!{
userID = updateduserID
}
if let updatedCreator = update["creator"] as! String!{
changedCreator = updatedCreator
}
let currentUser = FIRAuth.auth()?.currentUser?.uid
if changedCreator != nil
{
print("changed creator")
self.creator = changedCreator!
}
This crashed with an error code:
Could not cast value of type '__NSCFString' (0x10a77f4a0) to 'NSDictionary' (0x10a780288). at the line " update". This was my first attempt:
channelRef?.observe(.childChanged, with: { (snapshot) -> Void in
let value = snapshot.value as? NSDictionary
let readyToGoValue = value?["readyToGo"] as? Bool ?? false
let userID = value?["userID"] as? String ?? ""
var amountOfPlayers = value?["currentPlayers"] as? Int ?? 0
let changedCreator = value?["creator"] as? String ?? ""
print(snapshot)
let currentUser = FIRAuth.auth()?.currentUser?.uid
print(changedCreator)
print(amountOfPlayers)
if changedCreator != ""
{
print("changed creator")
self.creator = changedCreator
}
This doesn't work swell. When changing the creator (just a string) in Firebase, I get this as a print when adding print(snapshot):
Snap (creator) hi
However the print("changed creator") never is executed. Why is this?
edit: This is how I got channelRef?:
super.prepare(for: segue, sender: sender)
if let channel = sender as? Channel {
let chatVc = segue.destination as! channelMultiplayerViewController
chatVc.channel = channel
chatVc.channelRef = channelRef.child(channel.id)
chatVc.usersKey = userKey
}
Printing more data:
print("path channel ref: " + "\(self.channelRef)")
print("snapshot: " + "\(snapshot)")
print("value: " + "\(value)")
-path channel ref: Optional(https://X.com/channels/-KeGKaJavH6uPYaSa7k4)
-snapshot: Snap (creator) new Creator
-value: nil
Update:
data structure:
This will work for now, but isn't there a better approach?:
if snapshot.key == "creator"
{
changedCreator = snapshot.value as! String
}
Another problem, exactly the same as above but with the solution for the first problem, this problem won't get solved. When I try to get the first child node, so the first user, and trying to get their userID, nothing works. I use this code:
let firstChild = UInt(1)
self.channelRef?.queryLimited(toFirst: firstChild).observeSingleEvent(of: .value, with: { (snapshot) in
let value = snapshot.value as? NSDictionary
print(snapshot)
print(value)
let newCreator = value?.value(forKey: "userID") as? String
if newCreator != nil{
print("Got the userID")
}
if snapshot.key == "userID"
{
print("Got the userID")
}
})
Snap (-KeJWMiXaL-FGp0J7b3u) {
"-KeJWO0V9kxgGnrACAtP" = {
PictureVersion = 2;
readyToGo = 0;
userID = SZlQ76RLCJQpFa0CDhrgFJoYzrs2;
username = pietje;
};
}
Optional({
"-KeJWO0V9kxgGnrACAtP" = {
PictureVersion = 2;
readyToGo = 0;
userID = SZlQ76RLCJQpFa0CDhrgFJoYzrs2;
username = pietje;
};
})
And this prints out, so no userID is given. Why is this? The userID is right there! I read the docs but it should work...

Answer 1

Try replacing chatVc.channelRef = channelRef.child(channel.id) with chatVc.channelRef = channelRef