feat: Add field Meta.sub_model_type to sub-models

ref: #732 #564

app/core/viewsets/ticket.py

@@ -27,10 +27,16 @@ def spectacular_request_serializers( serializer_type = 'Model'):
 
         if issubclass(model, TicketBase):
 
+            serializer_name = 'ticket'
+
+            if model._meta.model_name != 'ticketbase':
+                
+                serializer_name += '_' + model._meta.sub_model_type
+
             serializer_module = importlib.import_module(
                 model._meta.app_label + '.serializers.' + str(
-                    model._meta.verbose_name
-                ).lower().replace(' ', '_')
+                    serializer_name
+                )
             )
 
             serializers.update({