compare textfield.text to firebase string swift

Question

I have a database in Firebase that will have individual user nodes. In each user\'s node will be data pertaining to them and will be private. In addition to that I want to c

Answer 1

Please don't use email addresses as keys. Email addresses are dynamic and may change (as in if the users wants to change it) and if they do, you'll have a mess on your hands as every node that directly used that email would have be deleted and re-created.

Best practice is to disassociate key's from the data they contain.

Here's the structure to use

emails
  -Yiaisjpa90is
    email: "dude@test.com"
  -Yijs9a9js09a
    email: "thing@test.com"

then you simply query the email node for the email you are looking for, and handle accordingly if it exists.

And some code

emailsRef.queryOrdered(byChild: "email").queryEqual(toValue: "dude@test.com")
         .observe(.value, with: { snapshot in
     if snapshot.value is NSNull {
        print("the snapshot was null, no email found")
     } else {
        print("email was found, YIPEE")
     }  
})

For completeness it would be a little more Swifty to use

if snapshot.exists() {
  print("found it")
} else {
  print("no email found")
}