Django 1.7 And You

Transcript

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   1.7 Andrew Godwin @andrewgodwin & you

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

   of 1.7 Django migrations Generally far too involved in Django
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   Django 1.7 Migrations Scheduled release: May 15th (we'll probably miss

   it) App loading refactor Checks framework select_related filters Custom lookups
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   Migrations They're pretty good.

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

   Migration handling User interface Backport for 1.4 - 1.6
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   Logically Separate Schema backend ORM Hooks Migration handling User interface

   SchemaEditor Migrations
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   A New Format More concise Declarative Introspectable

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   Migration actions Frozen ORM

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   None
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    In-memory running Creates models from migration sets Autodetector diffs created

    from on-disk Used to feed SchemaEditor / ORM
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    Backwards Compatability Auto-applies first migration if tables exist Ignores South-style

    migrations South will start looking for south_migrations
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    App Loading Mostly internal change App objects per-app Start of

    long path away from settings
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    Checks Framework Proper support for project-level validation Old validation moved

    in Upgrade warnings now possible
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    from django.core.checks import register @register() def example_check(app_configs, **kwargs): errors =

    [] # ... your check logic here return errors
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    prefetch_related control Now accepts a Prefetch object Can customise order,

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

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    Custom Lookups Allows for more powerful Field subclasses You can

    stop using .extra() and .raw() as much
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    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
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    Important Upgrade Notes

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

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

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    initial_data is dead Use data migrations and the ORM instead

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    Django 1.8? LTS Migrations for contrib apps PostgreSQL improvements?

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    Thanks. @andrewgodwin aeracode.org