Prefetching the user object when getting the token in TokenAuthentication.

Since the user object is fetched 4 lines after getting Token from the database, this removes a DB query for each token-authenticated request.

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/test_authentication.py b/tests/test_authentication.py
index 44837c4e..caabcc21 100644
--- a/tests/test_authentication.py
+++ b/tests/test_authentication.py
@@ -202,6 +202,12 @@ class TokenAuthTests(TestCase):
         response = self.csrf_client.post('/token/', {'example': 'example'}, format='json', HTTP_AUTHORIZATION=auth)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
 
+    def test_post_json_makes_one_db_query(self):
+        """Ensure that authenticating a user using a token performs only one DB query"""
+        auth = "Token " + self.key
+        func_to_test = lambda: self.csrf_client.post('/token/', {'example': 'example'}, format='json', HTTP_AUTHORIZATION=auth)
+        self.assertNumQueries(1, func_to_test)
+
     def test_post_form_failing_token_auth(self):
         """Ensure POSTing form over token auth without correct credentials fails"""
         response = self.csrf_client.post('/token/', {'example': 'example'})