1. Prevent inserts with a lock.
  2. Check if the key exists.
  3. If not, insert the record.
  4. Release the lock.

I don't see anything that would allow what you want more directly in the PostgreSQL or DBIx::Class docs. Neither even support a database-level "insert or update".

I'm by no means a DBIx::Class expert. Or user.

In reply to Re: how to tell if ->insert succeeded in DBIx::Class? by ikegami
in thread how to tell if ->insert succeeded in DBIx::Class? by perl5ever

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