currval has not yet been defined this session, how to get multi-session sequences?

Question

My objective is to get a primary key field automatically inserted when inserting new row in the table.

How to get a sequence going from session to session in Postg

Answer 1

Actually nextval will advance sequence and return the new value, so that would be the answer for your question.

currval will return the value most recently obtained with nextval for specified sequence (This though might fail if there wasn't nextval used in current session).