Software Development
More about Django · Module 2 - Models and the ORM in depth

2.3 QuerySets you actually need

26 min
Back to the curriculum

Video coming soon

The recording for this lesson has not been published yet.

What we cover

  • filter, exclude and chaining
  • Q objects for OR and negation
  • F expressions for field-to-field comparisons
  • annotate and aggregate for counts and averages
  • Laziness: when a QuerySet hits the database
Written notes for this lesson are being prepared. The outline above already shows what the recording will cover.
← 2.2 Migrations for real 2.4 Custom managers and querysets →

After this lesson you will

  • Express complex conditions in a single query
  • Compute values in the database, not in Python

Module 2

2.1Relations between models 2.2Migrations for real 2.3QuerySets you actually need 2.4Custom managers and querysets 2.5Killing N+1 queries 2.6Slugs, timestamps and abstract base models