Comparing Models in Django -

i have 2 models, model , model b. within model column called modules, , within model b column called new modules.

what want compare values in new modules column against values in modules column in model a, , return list of values in new modules column didn't match value in modules column

i'm unable create query want, , wondering know how this.

modules_a = modela.objects.values_list('modules', flat=true).distinct() modules_b = modelb.objects.values_list('new_modules', flat=true).distinct() diff = [i in module_b if not in modules_a] 

https://docs.djangoproject.com/en/1.9/ref/models/querysets/#values-list