From 054782ee16bd638c63bb37701d841a98d51a8b0f Mon Sep 17 00:00:00 2001
From: Jake Yip <jake.yip@unimelb.edu.au>
Date: Wed, 1 May 2019 11:37:31 +1000
Subject: [PATCH] allow an empty string to unset options

For command `alarm update`, options like `--alarm-actions` cannot be
unset. Update utils to allow user to pass in an empty string in command
line to unset these values.

Change-Id: Ib6c712d8ad1a69b16dfef83362c576e80223f5a2
---
 aodhclient/utils.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/aodhclient/utils.py b/aodhclient/utils.py
index 11609ec..8d2fd55 100644
--- a/aodhclient/utils.py
+++ b/aodhclient/utils.py
@@ -131,7 +131,14 @@ def dict_from_parsed_args(parsed_args, attrs):
         else:
             value = getattr(parsed_args, attr)
         if value is not None:
-            d[attr] = value
+            if value == [""]:
+                # NOTE(jake): As options like --alarm-actions is an array,
+                # their value can be array with empty string if user set option
+                # to ''. In this case we set it to None here so that a None
+                # value gets sent to API.
+                d[attr] = None
+            else:
+                d[attr] = value
     return d