only register gcal_link if necessary

diff --git a/gooswapper.py b/gooswapper.py
index f3c73a0610e4c4dcaab4faeb39f249957a1954ac..75edd3febb2c54bcd77979cfadd513b4268f169e 100644 (file)
--- a/gooswapper.py
+++ b/gooswapper.py
@@ -54,7 +54,10 @@ class ex_gcal_link(exchangelib.ExtendedProperty):
     property_name = "google calendar event id"
     property_type = 'String'
 
     property_name = "google calendar event id"
     property_type = 'String'
 

-exchangelib.CalendarItem.register('gcal_link',ex_gcal_link)
+try:
+    exchangelib.CalendarItem.get_field_by_fieldname('gcal_link')
+except ValueError:
+    exchangelib.CalendarItem.register('gcal_link',ex_gcal_link)

 
 #useful if you want to replay an event
 def drop_from_ex_cache(itemid):
 
 #useful if you want to replay an event
 def drop_from_ex_cache(itemid):