'Shifts all help entries in database to default_category.  This
action cannot be reverted. It is used primarily by the engine
when importing a default help database, making sure this ends
up in one easily separated category.
Args:
default_category (str): Category to move entries to.'

def all_to_category(self, default_category):

    topics = self.all()
    for topic in topics:
        topic.help_category = default_category
        topic.save()
    string = ('Help    database    moved    to    category    %s' % default_category)
    logger.log_info(string)
