邮递员无法发布负数，怎么办？答案

【问题标题】：Not being able to POST negative numbers by Postman, how to do that?邮递员无法发布负数，怎么办？
【发布时间】：2022-01-14 15:41:30
【问题描述】：

我有一个 Python 应用程序，它使用 Postman 来 GET 和 POST 数据到/从 MongoDB。这是一个简单的 GasStation 应用程序，但它让我们发布负数。如何验证不允许负数？

@server_api.route('/add_data', methods=['POST'])
def receive_data():
    data_received = request.get_json()
    if "PetrolCapacity" not in data_received or "DieselCapacity" not in data_received:
        return Response("Bad arguments", 400)
    print(data_received)
    service.push_to_database(data_received)
    return Response("Data received successfully", 200)


@server_api.route('/get_data', methods=['GET'])
def return_data():
    last_element = service.query_last_element()
    print(last_element)

    data = last_element['PetrolCapacity']
    return data

【问题讨论】：

标签： python json mongodb validation postman

【解决方案1】：

你可以像这样比较它们：

@server_api.route('/add_data', methods=['POST'])
def receive_data():
    data_received = request.get_json()
    if "PetrolCapacity" not in data_received or "DieselCapacity" not in data_received:
        return Response("Bad arguments", 400)

    petrol_capacity = data_received["PetrolCapacity"]
    for tank in petrol_capacity:
        if petrol_capacity[tank] < 0:
            return Response("Negative values not allowed", 400)

    if data_received["DieselCapacity"] < 0:
        return Response("Negative values not allowed", 400)

    print(data_received)
    service.push_to_database(data_received)
    return Response("Data received successfully", 200)


@server_api.route('/get_data', methods=['GET'])
def return_data():
    last_element = service.query_last_element()
    print(last_element)

    data = last_element['PetrolCapacity']
    return data

【讨论】：

谢谢，它有效！
没问题！祝你好运！ :)