An inner join with SqlAlchemy

Question

I have a raw inner join query with counting, written directly on Postgres SQL:

    SELECT \"films\".\"id\" AS \"megaId\", 
           COUNT(\"filmComments\".         


        

Answer 1

Mapping that to SQLAlchemy should be quite straightforward. I'm not considering the aliases, for obvious reasons.

from sqlalchemy import func

megaId, numOfComments = (session.query(Film.id, func.count(FilmComment.id))
                                .join(FilmComment, Film.id == FilmComment.filmId)
                                .group_by(Film.id).first())

This should work. The explicit on clause wouldn't be needed if FilmComment.filmId were declared as a foreign key.