Update error message

arkindex/dataimport/api.py

@@ -1038,7 +1038,7 @@ class WorkerConfigurationList(WorkerACLMixin, ListCreateAPIView):
                 Q(configuration=configuration) | Q(name=name)
             )
         ).exists():
-            raise ValidationError({'worker': 'A worker configuration with this worker and this name or this configuration already exists'})
+            raise ValidationError({'__all__': 'A worker configuration with this name or this configuration already exists for this worker'})
 
         configuation = WorkerConfiguration.objects.create(
             worker=worker,

arkindex/dataimport/tests/test_workers.py

@@ -1060,7 +1060,7 @@ class TestWorkersWorkerVersions(FixtureAPITestCase):
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertDictEqual(
             response.json(),
-            {'worker': 'A worker configuration with this worker and this name or this configuration already exists'}
+            {'__all__': 'A worker configuration with this name or this configuration already exists for this worker'}
         )
 
     def test_configurations_create_configuration_already_exists(self):
@@ -1087,7 +1087,7 @@ class TestWorkersWorkerVersions(FixtureAPITestCase):
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertDictEqual(
             response.json(),
-            {'worker': 'A worker configuration with this worker and this name or this configuration already exists'}
+            {'__all__': 'A worker configuration with this name or this configuration already exists for this worker'}
         )
 
     def test_configurations_create(self):