fixes

netbox/dcim/choices.py

@@ -2093,7 +2093,7 @@ class PowerOutletStatusChoices(ChoiceSet):
 #
 
 class CoolingMethodChoices(ChoiceSet):
-    key = 'CoolingMethod'
+    key = 'Device.cooling_method'
 
     METHOD_AIR = 'air'
     METHOD_LIQUID = 'liquid'

netbox/dcim/tests/test_api.py

@@ -4125,6 +4125,12 @@ class CoolingFeedTestCase(APIViewTestCases.APIViewTestCase):
                 'rack': racks[3].pk,
                 'type': RETURN,
             },
+            {
+                'name': 'Cooling Feed 4C',
+                'cooling_source': cooling_sources[0].pk,
+                'rack': racks[3].pk,
+                'type': SUPPLY,
+            },
         ]