def get_device(user, uid, user_agent, undelete=True):
"""
Loads or creates the device indicated by user, uid.
If the device has been deleted and undelete=True, it is undeleted.
"""
store_ua = user.profile.settings.get_wksetting(STORE_UA)
# list of fields to update -- empty list = no update
update_fields = []
try:
with transaction.atomic():
client = Client(id=uuid.uuid1(), user=user, uid=uid)
client.clean_fields()
client.clean()
client.save()
except IntegrityError:
client = Client.objects.get(user=user, uid=uid)
if client.deleted and undelete:
client.deleted = False
update_fields.append('deleted')
if store_ua and user_agent and client.user_agent != user_agent:
client.user_agent = user_agent
update_fields.append('user_agent')
if update_fields:
client.save(update_fields=update_fields)
return client
