Refactor to increase readability for getting whitelist objects

app/service/utils.py

@@ -0,0 +1,17 @@
+from app.models import (
+    ServiceWhitelist,
+    MOBILE_TYPE, EMAIL_TYPE)
+
+
+def get_recipients_from_request(request_json, key, type):
+    return [(type, recipient) for recipient in request_json.get(key)]
+
+
+def get_whitelist_objects(service_id, request_json):
+    return [
+        ServiceWhitelist.from_string(service_id, type, recipient)
+        for type, recipient in (
+            get_recipients_from_request(request_json, 'phone_numbers', MOBILE_TYPE) +
+            get_recipients_from_request(request_json, 'email_addresses', EMAIL_TYPE)
+        )
+    ]