Swift Firebase Must be a non-empty string and not contain '.' '#' '$' '[' or ']'

Question

This is a follow up to my previous question. I am trying to see if an email has already been used.

I am using the line

if snapshot.hasChild(email) {         


        

Answer 1

Firebase keys cannot contain a . (dot) character. If you want to store an email address in a key, you'll have to encode it. The common way to do that is to replace the . with a , (comma), which conveniently is not allowed in email addresses. So test1@test.com would be encoded as test1@test,com.

I don't think you're actually storing the email address as a key, but I'll follow up for that on your previous question.