'Return the list of courses which use this wiki_slug
:param wiki_slug: the course wiki root slug
:return: list of course keys'

@strip_key
def get_courses_for_wiki(self, wiki_slug, **kwargs):

    courses = []
    for modulestore in self.modulestores:
        courses.extend(modulestore.get_courses_for_wiki(wiki_slug, **kwargs))
    return courses
