From 590dedce13e04a91d13a3ce4f096f8a334c46ae4 Mon Sep 17 00:00:00 2001
From: Oliver Walters <oliver.henry.walters@gmail.com>
Date: Thu, 18 Apr 2019 23:08:33 +1000
Subject: [PATCH] Add some helper functions

---
 InvenTree/InvenTree/helpers.py | 9 +++++++++
 InvenTree/InvenTree/models.py  | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/InvenTree/InvenTree/helpers.py b/InvenTree/InvenTree/helpers.py
index ba3f3525d5..872c4fe458 100644
--- a/InvenTree/InvenTree/helpers.py
+++ b/InvenTree/InvenTree/helpers.py
@@ -4,6 +4,15 @@ from wsgiref.util import FileWrapper
 from django.http import StreamingHttpResponse
 
 
+def str2bool(text, test=True):
+    """ Test if a string 'looks' like a boolean value
+    """
+    if test:
+        return str(text).lower() in ['1', 'y', 'yes', 't', 'true', 'ok', ]
+    else:
+        return str(text).lower() in ['0', 'n', 'no', 'none', 'f', 'false',]
+
+
 def WrapWithQuotes(text):
     # TODO - Make this better
     if not text.startswith('"'):
diff --git a/InvenTree/InvenTree/models.py b/InvenTree/InvenTree/models.py
index 4c25be2fe6..b7468cd7cb 100644
--- a/InvenTree/InvenTree/models.py
+++ b/InvenTree/InvenTree/models.py
@@ -183,7 +183,7 @@ def FilterChildren(queryset, parent):
 
     if not parent:
         return queryset
-    elif str(parent).lower() in ['none', 'false', 'null', 'top', '0']:
+    elif str2bool(parent, False):
         return queryset.filter(parent=None)
     else:
         try: