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3a6c37fce4
The new signature enables better support for routing RunPython and
RunSQL operations, especially w.r.t. reusable and third-party apps.
This commit also takes advantage of the deprecation cycle for the old
signature to remove the backward incompatibility introduced in #22583;
RunPython and RunSQL won't call allow_migrate() when when the router
has the old signature.
Thanks Aymeric Augustin and Tim Graham for helping shape up the patch.
Refs 22583.
Conflicts:
django/db/utils.py
Backport of bed504d70b from master
63 lines
1.9 KiB
Python
63 lines
1.9 KiB
Python
from __future__ import unicode_literals
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from django.db import DEFAULT_DB_ALIAS
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class TestRouter(object):
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"""
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Vaguely behave like primary/replica, but the databases aren't assumed to
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propagate changes.
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"""
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def db_for_read(self, model, instance=None, **hints):
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if instance:
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return instance._state.db or 'other'
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return 'other'
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def db_for_write(self, model, **hints):
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return DEFAULT_DB_ALIAS
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def allow_relation(self, obj1, obj2, **hints):
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return obj1._state.db in ('default', 'other') and obj2._state.db in ('default', 'other')
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def allow_migrate(self, db, app_label, **hints):
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return True
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class AuthRouter(object):
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"""
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Control all database operations on models in the contrib.auth application.
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"""
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def db_for_read(self, model, **hints):
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"Point all read operations on auth models to 'default'"
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if model._meta.app_label == 'auth':
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# We use default here to ensure we can tell the difference
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# between a read request and a write request for Auth objects
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return 'default'
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return None
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def db_for_write(self, model, **hints):
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"Point all operations on auth models to 'other'"
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if model._meta.app_label == 'auth':
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return 'other'
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return None
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def allow_relation(self, obj1, obj2, **hints):
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"Allow any relation if a model in Auth is involved"
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if obj1._meta.app_label == 'auth' or obj2._meta.app_label == 'auth':
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return True
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return None
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def allow_migrate(self, db, app_label, **hints):
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"Make sure the auth app only appears on the 'other' db"
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if app_label == 'auth':
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return db == 'other'
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return None
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class WriteRouter(object):
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# A router that only expresses an opinion on writes
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def db_for_write(self, model, **hints):
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return 'writer'
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