Django 1.7 And You

A talk I gave at the San Francisco Django Meetup group

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
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