How to create a unique constraints in YML in Doctrine2?

Question

I Want to create a unique constraints on two attributs. The YML configuration with Doctrine2 isn't well documented. So I try to traduct the XML in YML. What's wrong with this code?

unique-constraints:
    name: event_user
    columns:
        event_id: ~
        user_id: ~

Thanks in advance.

Answer 1

Finally I managed to create it by this code:

    uniqueConstraints:
        event_user_idx:
            columns: event_id,user_id

But Thank Reuven for your answer.

Answer 2

You should try that:

uniqueConstraints:
  event_user:
    columns:
      - event_id
      - user_id