Add internal_name field to workflow serializer

Fixes workflow API creation view.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

HISTORY.rst

@@ -6,6 +6,8 @@
   single page navigation to jump to the home view.
 * Remove redundant Celery queue declarations from the
   file_metadata app.
+* Add internal_name field to workflow serializer. 
+  Fixes workflow API creation view.
 
 3.2.6 (2019-07-10)
 ==================

docs/releases/3.2.7.rst

@@ -13,6 +13,8 @@ Changes
   single page navigation to jump to the home view.
 - Remove redundant Celery queue declarations from the
   file_metadata app.
+- Add internal_name field to workflow serializer. 
+  Fixes workflow API creation view.
 
 Removals
 --------

mayan/apps/document_states/serializers.py

@@ -266,7 +266,7 @@ class WritableWorkflowSerializer(serializers.ModelSerializer):
             'url': {'view_name': 'rest_api:workflow-detail'},
         }
         fields = (
-            'document_types_pk_list', 'label', 'id', 'url',
+            'document_types_pk_list', 'label', 'id', 'internal_name', 'url',
         )
         model = Workflow