Add error handling for a raised AttributeError inside of a property call for "request.user".

rest_framework/request.py

@@ -223,7 +223,10 @@ class Request(object):
         by the authentication classes provided to the request.
         """
         if not hasattr(self, '_user'):
-            self._authenticate()
+            try:
+                self._authenticate()
+            except AttributeError as error:
+                raise RuntimeError("AttributeError: " + error.message)
         return self._user
 
     @user.setter

tests/test_request.py

@@ -333,24 +333,27 @@ class TestUserSetter(TestCase):
         login(self.request, self.user)
         self.assertEqual(self.request.user, self.user)
 
-    def test_calling_user_fails_when_exception_is_raised(self):
-        class AuthRaisesError(object):
+    def test_calling_user_fails_when_attribute_error_is_raised(self):
+        """
+        This proves that when an AttributeError is raised inside of the request.user
+        property, that we can handle this and report the true, underlying error.
+        """
+        class AuthRaisesAttributeError(object):
             def authenticate(self, request):
-                raise AttributeError('We should see this error!')
-                # import rest_framework
-                # rest_framework.MISSPELLED_NAME_THAT_DOESNT_EXIST
+                import rest_framework
+                rest_framework.MISSPELLED_NAME_THAT_DOESNT_EXIST
 
-        self.request = Request(factory.get('/'), authenticators=(AuthRaisesError(),))
+        self.request = Request(factory.get('/'), authenticators=(AuthRaisesAttributeError(),))
         SessionMiddleware().process_request(self.request)
 
         login(self.request, self.user)
         error_seen = None
         try:
             self.request.user
-        except AttributeError as error:
+        except RuntimeError as error:
             error_seen = error
 
-        self.assertEqual('We should see this error!', error_seen.message)
+        self.assertEqual("AttributeError: 'module' object has no attribute 'MISSPELLED_NAME_THAT_DOESNT_EXIST'", error_seen.message)
 
     def test_user_can_logout(self):
         self.request.user = self.user