def post(self, product): product = StoreModel.find_by_product(product) if product: return {'message': 'Product already in database!'} else: parser = reqparse.RequestParser() parser.add_argument('product', type=str, required=True, help='This field is mandatory!') parser.add_argument('price', type=float, required=True, help='This field is mandatory!') data_payload = parser.parse_args() StoreModel.add_product(data_payload['product'], data_payload['price']) return {'message': 'Product successfully added to database!'}, 201