[TYPO3-mvc] How to validate if input value is unique in table?

[Uwe Michelfelder]

Hi list,

I want to validate that the given email is not already used in the
repository.

How is this solved correctly?

If I create a custom validator in the Domain Model checking against the
repository by using ->findbyEmail() it would work for the add function,
but not validate at updating the Object, because the repository finds
the currently updated Object itself.

Any suggestions to solve this?

Greetings,
Uwe