mirror of
https://github.com/django/django.git
synced 2025-01-15 21:02:52 +00:00
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 bed504d70bede3431a213203c13a33905d6dbf77 from master
63 lines
1.9 KiB
Python
63 lines
1.9 KiB
Python
from __future__ import unicode_literals
|
|
|
|
from django.db import DEFAULT_DB_ALIAS
|
|
|
|
|
|
class TestRouter(object):
|
|
"""
|
|
Vaguely behave like primary/replica, but the databases aren't assumed to
|
|
propagate changes.
|
|
"""
|
|
|
|
def db_for_read(self, model, instance=None, **hints):
|
|
if instance:
|
|
return instance._state.db or 'other'
|
|
return 'other'
|
|
|
|
def db_for_write(self, model, **hints):
|
|
return DEFAULT_DB_ALIAS
|
|
|
|
def allow_relation(self, obj1, obj2, **hints):
|
|
return obj1._state.db in ('default', 'other') and obj2._state.db in ('default', 'other')
|
|
|
|
def allow_migrate(self, db, app_label, **hints):
|
|
return True
|
|
|
|
|
|
class AuthRouter(object):
|
|
"""
|
|
Control all database operations on models in the contrib.auth application.
|
|
"""
|
|
|
|
def db_for_read(self, model, **hints):
|
|
"Point all read operations on auth models to 'default'"
|
|
if model._meta.app_label == 'auth':
|
|
# We use default here to ensure we can tell the difference
|
|
# between a read request and a write request for Auth objects
|
|
return 'default'
|
|
return None
|
|
|
|
def db_for_write(self, model, **hints):
|
|
"Point all operations on auth models to 'other'"
|
|
if model._meta.app_label == 'auth':
|
|
return 'other'
|
|
return None
|
|
|
|
def allow_relation(self, obj1, obj2, **hints):
|
|
"Allow any relation if a model in Auth is involved"
|
|
if obj1._meta.app_label == 'auth' or obj2._meta.app_label == 'auth':
|
|
return True
|
|
return None
|
|
|
|
def allow_migrate(self, db, app_label, **hints):
|
|
"Make sure the auth app only appears on the 'other' db"
|
|
if app_label == 'auth':
|
|
return db == 'other'
|
|
return None
|
|
|
|
|
|
class WriteRouter(object):
|
|
# A router that only expresses an opinion on writes
|
|
def db_for_write(self, model, **hints):
|
|
return 'writer'
|