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61 lines
1.9 KiB
Python
61 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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# A test router. The behavior is vaguely primary/replica, but the
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# databases aren't assumed to propagate changes.
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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, model):
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return True
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class AuthRouter(object):
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"""A router to control all database operations on models in
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the contrib.auth application"""
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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, model):
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"Make sure the auth app only appears on the 'other' db"
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if db == 'other':
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return model._meta.app_label == 'auth'
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elif model._meta.app_label == 'auth':
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return False
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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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