如何在 Flask-restful 中返回错误消息？答案

【问题标题】：How do I return an error message in Flask-resful?如何在 Flask-restful 中返回错误消息？
【发布时间】：2017-06-17 04:47:42
【问题描述】：

我在 Post 方法上添加了一个检查，只允许不同日期的约会通过，但我不知道如何返回错误消息。这是代码

from flask_restful import Resource, Api, request
from package.model import conn


class Appointments(Resource):

    def get(self):
        appointment = conn.execute("SELECT p.*,d.*,a.* from appointment a LEFT JOIN patient p ON a.pat_id = p.pat_id LEFT JOIN doctor d ON a.doc_id = d.doc_id ORDER BY appointment_date DESC").fetchall()
        return appointment

    def post(self):
        appointment = request.get_json(force=True)
        pat_id = appointment['pat_id']
        doc_id = appointment['doc_id']
        appointment_date = appointment['appointment_date']

        a = conn.execute("SELECT count(*) From appointment WHERE doc_id =?
         AND appointment_date=?",(doc_id,appointment_date,)).fetchone()
        if a['count(*)'] == 0:
            appointment['app_id'] = conn.execute('''INSERT INTO appointment(pat_id,doc_id,appointment_date)VALUES(?,?,?)''', (pat_id, doc_id,appointment_date)).lastrowid
            conn.commit()
            return appointment
        else:
            pass

我应该返回什么而不是 pass 语句？

PS：就上下文而言，我正在努力改进https://github.com/tushariscoolster/HospitalManagementSystem

【问题讨论】：

标签： python flask error-handling flask-restful

【解决方案1】：

Flask-Restful 提供了一个abort 函数，它可以通过特殊的HTTP 代码和消息引发HTTPException 并返回给客户端。

因此，您可以尝试更改如下代码：

from flask_restful import abort

class Appointments(Resource):
    def post(self):
        # ignore some code
        if a['count(*)'] == 0:
           # ignore some code
        else:
           abort(403, error_message='just accept an appointment on special date')

然后，客户端将收到 403 和一个有效的 JSON 字符串，如下所示：

{"error_message":"just accept an appointment on special date"}

最后，客户端应该正确处理错误信息。

【讨论】：