DB Using CodeIgniter’s Model - $afterFind

Hi everyone, I’m doing my own project and I have a couple of tables and I want to make a connection between them through $afterFind, but in the documentation, it’s not clear how to do it correctly. I have a table of films and there are additional tables for films (genres, countries, actors) and I need to link them to the main table of films and set up specific output fields. Maybe someone already made a similar connection.