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Asked: 2026-05-11T03:58:21+00:00

I’m using the SQLAlchemy Python ORM in a Pylons project. I have a class

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I’m using the SQLAlchemy Python ORM in a Pylons project. I have a class ‘Project’ which has a one to many relationship with another class ‘Entry’. I want to do a query in SQLAlchemy that gives me all of the projects which have one or more entries associated with them. At the moment I’m doing:

[project for project in Session.query(Project) if len(project.entries)>0]

which I know isn’t ideal, but I can’t figure out how to do a filter that does what I require (e.g. Session.query(Project).filter(Project.entries.exists())).

Any ideas?

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1 Answer

  1. Session.query(Project).filter(Project.entries.any()) should work.

    Edited credit of James Brady’s comment, be sure to give him some love.

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