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from django.db import DEFAULT_DB_ALIAS
class TestRouter:
"""
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:
"""
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"
return obj1._meta.app_label == "auth" or obj2._meta.app_label == "auth" or 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:
# A router that only expresses an opinion on writes
def db_for_write(self, model, **hints):
return "writer"
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