Django 1.7 And You

Transcript

1. 1.7 Andrew Godwin @andrewgodwin & you

2. Andrew Godwin Author of South migrations library Hi, I'm Author

   of 1.7 Django migrations Generally far too involved in Django

3. Django 1.7 Migrations Scheduled release: May 15th (we'll probably miss

   it) App loading refactor Checks framework select_related filters Custom lookups

4. Migrations They're pretty good.

5. The (second) Plan Django Schema backend ORM Hooks South 2

   Migration handling User interface Backport for 1.4 - 1.6

6. Logically Separate Schema backend ORM Hooks Migration handling User interface

   SchemaEditor Migrations

7. A New Format More concise Declarative Introspectable

8. Migration actions Frozen ORM

9. None

10. In-memory running Creates models from migration sets Autodetector diffs created

    from on-disk Used to feed SchemaEditor / ORM

11. Backwards Compatability Auto-applies first migration if tables exist Ignores South-style

    migrations South will start looking for south_migrations

12. App Loading Mostly internal change App objects per-app Start of

    long path away from settings

13. Checks Framework Proper support for project-level validation Old validation moved

    in Upgrade warnings now possible

14. from django.core.checks import register @register() def example_check(app_configs, **kwargs): errors =

    [] # ... your check logic here return errors

15. prefetch_related control Now accepts a Prefetch object Can customise order,

    select_related, or filter

16. Pizza.objects.prefetch_related( Prefetch( 'restaurants', queryset=Restaurant.objects.select_related('best_pizza'), ) )

17. Custom Lookups Allows for more powerful Field subclasses You can

    stop using .extra() and .raw() as much

18. from django.db.models import Lookup class NotEqual(Lookup): lookup_name = 'ne' def

    as_sql(self, qn, connection): lhs, lhs_params = self.process_lhs(qn, connection) rhs, rhs_params = self.process_rhs(qn, connection) params = lhs_params + rhs_params return '%s <> %s' % (lhs, rhs), params

19. Important Upgrade Notes

20. Fields need deconstruct() It's a required new method for all

    fields.

21. syncdb is deprecated Use migrate (old apps will still work)

22. initial_data is dead Use data migrations and the ORM instead

23. Django 1.8? LTS Migrations for contrib apps PostgreSQL improvements?

24. Thanks. @andrewgodwin aeracode.org