From 2864576c0c8b988c9356083fb0eb56711a126c35 Mon Sep 17 00:00:00 2001
From: evgeniy-st <stoyushko.evgeniy@gmail.com>
Date: Thu, 24 Oct 2019 17:09:08 +0300
Subject: [PATCH] fix TimeZoneChoiceField

---
 apps/utils/serializers.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/apps/utils/serializers.py b/apps/utils/serializers.py
index a2a33ee2..eeff1043 100644
--- a/apps/utils/serializers.py
+++ b/apps/utils/serializers.py
@@ -58,7 +58,11 @@ class TimeZoneChoiceField(serializers.ChoiceField):
         super().__init__(choices=choices, **kwargs)
 
     def to_representation(self, value):
-        return value.zone
+        if isinstance(value, str):
+            return value
+        elif isinstance(value, pytz.tzinfo.BaseTzInfo):
+            return value.zone
+        return None
 
     def to_internal_value(self, data):
         return pytz.timezone(data)