Refs #24351 -- Removed support for the old allow_migrate() signature per deprecation timeline.

django/db/utils.py

-import inspect
 import os
 import pkgutil
-import warnings
 from importlib import import_module
 from threading import local
 
@@ -9,7 +7,6 @@ from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.utils import six
 from django.utils._os import npath, upath
-from django.utils.deprecation import RemovedInDjango110Warning
 from django.utils.functional import cached_property
 from django.utils.module_loading import import_string
 
@@ -298,26 +295,7 @@ class ConnectionRouter(object):
                 # If the router doesn't have a method, skip to the next one.
                 continue
 
-            if six.PY3:
-                sig = inspect.signature(router.allow_migrate)
-                has_deprecated_signature = not any(
-                    p.kind == inspect.Parameter.VAR_KEYWORD for p in sig.parameters.values()
-                )
-            else:
-                argspec = inspect.getargspec(router.allow_migrate)
-                has_deprecated_signature = len(argspec.args) == 3 and not argspec.keywords
-
-            if has_deprecated_signature:
-                warnings.warn(
-                    "The signature of allow_migrate has changed from "
-                    "allow_migrate(self, db, model) to "
-                    "allow_migrate(self, db, app_label, model_name=None, **hints). "
-                    "Support for the old signature will be removed in Django 1.10.",
-                    RemovedInDjango110Warning)
-                model = hints.get('model')
-                allow = None if model is None else method(db, model)
-            else:
-                allow = method(db, app_label, **hints)
+            allow = method(db, app_label, **hints)
 
             if allow is not None:
                 return allow

docs/topics/db/multi-db.txt

@@ -182,12 +182,6 @@ A database Router is a class that provides up to four methods:
     keys, extra tables, or missing tables if you change it once you have
     applied some migrations.
 
-    .. versionchanged:: 1.8
-
-        The signature of ``allow_migrate`` has changed significantly from previous
-        versions. See the :ref:`deprecation notes
-        <deprecated-signature-of-allow-migrate>` for more details.
-
 A router doesn't have to provide *all* these methods -- it may omit one
 or more of them. If one of the methods is omitted, Django will skip
 that router when performing the relevant check.

tests/multiple_database/tests.py

@@ -2,7 +2,6 @@ from __future__ import unicode_literals
 
 import datetime
 import pickle
-import warnings
 from operator import attrgetter
 
 from django.contrib.auth.models import User
@@ -12,7 +11,6 @@ from django.db import DEFAULT_DB_ALIAS, connections, router, transaction
 from django.db.models import signals
 from django.db.utils import ConnectionRouter
 from django.test import SimpleTestCase, TestCase, override_settings
-from django.utils.encoding import force_text
 from django.utils.six import StringIO
 
 from .models import Book, Person, Pet, Review, UserProfile
@@ -1062,36 +1060,6 @@ class RouterTestCase(TestCase):
             self.assertTrue(router.allow_migrate_model('other', User))
             self.assertTrue(router.allow_migrate_model('other', Book))
 
-    def test_migrate_legacy_router(self):
-        class LegacyRouter(object):
-            def allow_migrate(self, db, model):
-                """
-                Deprecated allow_migrate signature should trigger
-                RemovedInDjango110Warning.
-                """
-                assert db == 'default'
-                assert model is User
-                return True
-
-        with override_settings(DATABASE_ROUTERS=[LegacyRouter()]):
-            with warnings.catch_warnings(record=True) as recorded:
-                warnings.filterwarnings('always')
-
-                msg = (
-                    "The signature of allow_migrate has changed from "
-                    "allow_migrate(self, db, model) to "
-                    "allow_migrate(self, db, app_label, model_name=None, **hints). "
-                    "Support for the old signature will be removed in Django 1.10."
-                )
-
-                self.assertTrue(router.allow_migrate_model('default', User))
-                self.assertEqual(force_text(recorded.pop().message), msg)
-
-                self.assertEqual(recorded, [])
-
-                self.assertTrue(router.allow_migrate('default', 'app_label'))
-                self.assertEqual(force_text(recorded.pop().message), msg)
-
     def test_partial_router(self):
         "A router can choose to implement a subset of methods"
         dive = Book.objects.using('other').create(title="Dive into Python",