'Return collections in this order:
1. SFW/NSFW
2. Spotlighted
3. Alphabetical'

@classmethod
def get_all(cls):

    all_collections = CollectionStorage.get_all()
    sorted_collections = sorted(all_collections, key=(lambda collection: (collection.over_18, (- collection.is_spotlight), collection.name.lower())))
    return sorted_collections
