confirmation: Set confirmation object realm attribute in realm reactivation.

The value of realm attribute in confirmation object used to be empty
before. We are not currently using the realm attribute of reactivation
links anywhere. The value of realm stored in content_object is currently
used.

confirmation/models.py

@@ -72,6 +72,9 @@ def create_confirmation_link(obj: ContentType, host: str,
     realm = None
     if hasattr(obj, 'realm'):
         realm = obj.realm
+    elif isinstance(obj, Realm):
+        realm = obj
+
     Confirmation.objects.create(content_object=obj, date_sent=timezone_now(), confirmation_key=key,
                                 realm=realm, type=confirmation_type)
     return confirmation_url(key, host, confirmation_type, url_args)

zerver/tests/test_realm.py

@@ -223,6 +223,15 @@ class RealmTest(ZulipTestCase):
         realm = get_realm('zulip')
         self.assertFalse(realm.deactivated)
 
+    def test_realm_reactivation_confirmation_object(self) -> None:
+        realm = get_realm('zulip')
+        do_deactivate_realm(realm)
+        self.assertTrue(realm.deactivated)
+        create_confirmation_link(realm, realm.host, Confirmation.REALM_REACTIVATION)
+        confirmation = Confirmation.objects.last()
+        self.assertEqual(confirmation.content_object, realm)
+        self.assertEqual(confirmation.realm, realm)
+
     def test_do_send_realm_reactivation_email(self) -> None:
         realm = get_realm('zulip')
         do_send_realm_reactivation_email(realm)