Cerberus oneof two keys

Question

I have a set of schemas I'm using to validate one of my input routes:

# schemas is just a dict of validator schemas
REGISTRATION_VALIDATOR = {
    'email_address': schemas['email_address'],
    'user_level': schemas['user_level'],
    'first_name': schemas['first_name'],
    'last_name': schemas['last_name'],
    'mobile_number': schemas['mobile_number'],
    'auth_method': schemas['auth_method']
}

but I need to define that either email_address or mobile_number is required but not both. How to require only one of those two keys?

Answer 1

There's the excludes rule that you can set for both fields, pointing with the constraint to the other.