How do I return an error message in Flask-resful?

Question

I added a check on a Post method to only let appointments on different dates pass through but I don't know how to return an error msg. here's the code

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

what do I return instead of the pass statement?

PS: For context, I'm trying to improve https://github.com/tushariscoolster/HospitalManagementSystem

Benjamin Yan · Accepted Answer · 2017-06-17 09:35:40Z

Flask-Restful provides an abort function, it's can raise an HTTPException with special HTTP code and message back to the client.

So, you can try to change the code like below:

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')

then, the client will receive 403 and a valid JSON string like below:

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

The last, the client should deal with the error message properly.

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