def put(self, product_uuid):
    data = product.parser.parse_args()

    product = productModel.find_by_product_uuid(product_uuid)

    if product == None:
        product = ProductModel(product_uuid, **data)
    else:
        product.product_number =    data['product_number']
        product.target_edit =       data['target_edit']
        # not part of the model, but included for return purposes
        product.comments =          data['comments']

    product.save_to_db()

    # delete all existing comments first
    for existing_comment in CommentModel.find_all_by_product_uuid(product_uuid):
        existing_comment.delete_from_db()

    # add new comments
    for comment_data in data['comments']:
        comment = CommentModel(product_uuid=product_uuid, **comment_data)
        comment.save_to_db()