#35407: Cache Model._meta.swapped -------------------------------------+------------------------------------- Reporter: Adam | Owner: nobody Johnson | Type: | Status: new Cleanup/optimization | Component: Database | Version: dev layer (models, ORM) | Severity: Normal | Keywords: Triage Stage: | Has patch: 1 Unreviewed | Needs documentation: 0 | Needs tests: 0 Patch needs improvement: 0 | Easy pickings: 0 UI/UX: 0 | -------------------------------------+------------------------------------- Another candidate for caching, like #35232 before.
The `Model._meta.swapped` property returns the model that this one has been swapped for. Since most models are not swappable (only `auth.User` is officially swappable), it returns `None` in nearly all cases. I found this property was the most called function in Django when profiling a subset of Django’s tests, with: {{{ $ python -m cProfile -o profile runtests.py --parallel 1 *model* $ python -m pstats profile <<< 'sort ncalls stats 10000' | less }}} This showed 439,484 calls to `swapped`, taking 29ms of the 5.597s test run, or 0.5% of the total runtime. After adding `@cached_property`, this is reduced to 3,653 calls, rounding down to 0ms. -- Ticket URL: <https://code.djangoproject.com/ticket/35407> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/0107018f19ae54dc-c924e0b2-ab39-4b00-b808-b9e886fe2996-000000%40eu-central-1.amazonses.com.