Lesson 20 — Custom manager

Name your common queries

A manager is the object behind Post.objects. You can add your own methods to it, so instead of repeating filter(pub=True) in ten views you write Post.objects.published() once.

class PostManager:
    def published(self):
        return [p for p in self.rows if p["pub"]]

Note: the exercise runs in your browser without Django installed, so it is a small plain-Python simulation of what Django does for you.

Why it matters: one named query is one place to fix when the rule changes ("published and not deleted").