Swift, Firebase. Check if a users, childs value exists - swift

Question

In my game you, first have to login, then you have to choose a team name, which gets stored in my firebase database, under the players UID, and when the player has entered his team name, I want to check if it is already taken, or the player is good to go.
let rootRef = FIRDatabase.database().reference()
rootRef.queryOrderedByChild("teamName").queryEqualToValue("Bob fc").observeEventType(.Value, withBlock: { snapshot in
if (snapshot.value is NSNull) {
print("Name is not in use")
} else {
print("Name is in use")
}
})
My data tree:
{
"users" : {
"pbXvXYOKmJQqwSQZ9IlBykG7x1P2" : {
"teamName" : "Bob fc"
}
}
}
My database rules:
{
"rules": {
"users": {
"$uid": {
".read": "$uid === auth.uid",
".write": "$uid === auth.uid"
}
}
}
}
The problem is that it doesn't print anything, what am I doing wrong here?

Answer 1

You are querying your root ref. You should query the /users node instead
let rootRef = FIRDatabase.database().reference()
let usersRef = rootRef.childByAppendingPath("users")
usersRef.queryOrderedBy....
You can shorten that up but I used the verbose model for clarity.
As a side note, with Firebase 3.x, the default is to only allow authenticated users to read and write. This is accomplished through Rules in the Realtime Database section.
If you want to test your code without authenticating, change your Rules to this
{
"rules": {
".read": true,
".write": true
}
}
PLEASE NOTE: This opens up your data to ANYONE that wants to read it, but if you are just learning or testing an app it makes it a bit more convenient.