Takes a list of badge slugs and returns a tuple: ``(valid, invalid)``.

def get_recipe_instances_for_badges(self, badges):
        """
        Takes a list of badge slugs and returns a tuple: ``(valid, invalid)``.
        """
        from .exceptions import BadgeNotFound

        valid, invalid = [], []

        if not isinstance(badges, (list, tuple)):
            badges = [badges]

        for badge in badges:
            try:
                recipe = self.get_recipe_instance(badge)
                valid.append(recipe)
            except BadgeNotFound:
                logger.debug('✘ Badge "%s" has not been registered', badge)
                invalid.append(badge)

        return (valid, invalid)