SetValue in Swift from Firebase removes old value's

Question

In the documentation it says that I should use this code to set new value's:

self.ref.child("users").child(user.uid).setValue(["username": username])

This way, I can set an username. However, if I want to add another value later on, like XP points, I use the following line of code:

var XPPoints = 1    
self.ref.child("users").child(user.uid).setValue(["XPPoints": XPPoints])

This, however, deletes the username value, or any other value that was stored before. It replaces all value's. I tried also the second thing the docs are saying at: https://firebase.google.com/docs/database/ios/read-and-write#basic_write which is this line of code:

self.ref.child("users/(user.uid)/username").setValue(username)

This will crash my app instantly when starting up. My question is: How can I add data, and not replacing the old value's?

Edit: Fixed it by changing the code to: self.ref.child("users/\(user.uid)/username").setValue(username)

Answer 1

Your solution shouldn't fix the problem you are having. You need to use updateChildValues instead of setValue. This adds the values instead of overwriting everything in the referenced node.