def add_task(action, user):
"""
Adds a task.
{
'type': 'add_task',
'listId': <list temporary id>,
'what': <item>
}
"""
item = Item()
item.description = action["what"].get("description", "")
item.id = action["what"]["id"]
item.position = action["what"]["position"]
l = List.objects.get(id=action["listId"])
verify_permission(l, user)
l.items.append(item)
l.save()
return l
