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Add a new feature to the hall of fame to demonstrate how to check uniqueness #92
As we talked on Gitter with @codeliner , I would be interested to demonstrate the use of domain services to check, let's say, the uniqueness of an email address.
Example: Check that the user's email is not already used while registering a new user. At the moment, you can register twice with the same email address (when pressing the previous button and filling the registration form again).
Another improvement proposed by @bweston92 :