'Delete all assets identified via this course_key. Dangerous operation which may remove assets
referenced by other runs or other courses.
:param course_key:'

def delete_all_course_assets(self, course_key):

    course_query = query_for_course(course_key)
    matching_assets = self.fs_files.find(course_query)
    for asset in matching_assets:
        asset_key = self.make_id_son(asset)
        self.fs.delete(asset_key)
