Logic for setting up qualtrics links

gistfile1.txt

class QualtricsLink(NamedModel):
    def get_link(self):
        keys = QualtricsLink.all().fetch(100, keys_only=True)
        
        try:
            link = self._get_link_transactionally(keys.pop())
        # repeat if you don't have a link
        
        return link.link_string
    
    @db.transactional
    def _get_link_transactionally(self, key):
        # Will db.get fail properly if the key it's got has been deleted?
        link = db.get(keys.pop())
        # If it doesn't, maybe this?
        if link is None:
            raise Exception()
        db.delete(link)