# has fields in request params, else fetch all records
if query_data:
subscriptions = NsdmSubscriptionModel.objects.filter(**query_data)
else:
subscriptions = NsdmSubscriptionModel.objects.all()
if not subscriptions.exists():
# has fields in request params, else fetch all records
if query_data:
subscriptions = NsdmSubscriptionModel.objects.filter(**query_data)
else:
subscriptions = NsdmSubscriptionModel.objects.all()
if not subscriptions.exists():