How to make rules to validate a record in a database in YII2?

Question

Yii

Good day! I want to make an invite code, without which you can not register. I know that it is possible to link the rules to the database (as is done, for example, with checking for the uniqueness of the e-mail address), and accordingly, if there is no code in the database, throw an error, if there is, finish the registration and delete the code. Thank you!

Answer 1

and why ExistValidator did not please you? and it’s not difficult to see how standard validators are implemented and write your own