Firebase Authentication creates user but does not add their Info to database - swift

Question

I am new to using firebase and ios development in general. I am having an issue with adding user's info to the firestore database even though they are being added as authenticated users. Any Suggestions?
Auth.auth().createUser(withEmail: email, password: password) { (result, err) in
if err != nil {
self.errorLabel.text = "Error Creating User"
self.errorLabel.alpha = 1
} else {
let db = Firestore.firestore()
db.collection("users").addDocument(data: ["firstname":firstname, "lastname":lastname, "uid":result!.user.uid]) { (error) in
if error != nil {
self.errorLabel.text = "error saving user data"
self.errorLabel.alpha = 1
}
}
self.transitionScreens()
}
}
}
}

Answer 1

Change your code to the following:
// Add a new document with a generated ID
var ref: DocumentReference? = nil
ref = db.collection("users").addDocument(data: [
"firstname": firstname,
"lastname": lastname,
"uid": result!.user.uid
]) { err in
if let err = err {
print("Error adding document: \(err)")
} else {
print("Document added with ID: \(ref!.documentID)")
}
}
Using this print statement print("Error adding document: \(err)") you can know exactly what the error is.
Also change your security rules to the following:
// Allow read/write access to all users under any conditions
// Warning: **NEVER** use this rule set in production; it allows
// anyone to overwrite your entire database.
service cloud.firestore {
match /databases/{database}/documents {
match /{document=**} {
allow read, write: if true;
}
}
}

Answer 2

Check out the following different rules you can give access to users depending on the data
service cloud.firestore {
match /databases/{database}/documents {
//allows all users to read and write, but dangerous as any one can flood your database
match /public_collection/{document=**} {
allow read, write: if true;
}
//only read access
match /public_read_collection/{document=**} {
allow read: if true;
allow write: if false;
}
//prefered for storing users personal info, users can access only their data
match /users/{userId} {
allow read, write: if request.auth.uid == userId;
}
//any authenticated user can access or write data
match /posts/{documentId} {
allow read, write: if request.auth.uid != null;
}
}
}