python - Get error message from Flask custom validation -


i using flask_restful , want have custom validation. project_deadlines() method query database list of valid values. 

from flask import flask, request, jsonify flask_restful import resource, api, reqparse flask_restful import reqparse  class createproject(resource):     def project_deadlines(self, value):         deadline_ids = [item[0] item in get_all_deadlines()]         if not value in deadline_ids:             raise valueerror("the given deadline id '{}' not exist.".format(value))          return value      def post(self):         parser.add_argument('deadline_id', required=true, location='json',             type=self.project_deadlines, help="invalid deadline id given.")         args = parser.parse_args()   def get_all_deadlines(self):         return self.session.query(deadline.deadline_id, deadline.deadline_time).all()

this model class. sqlalchemy code has been stripped out. 

class deadline(base):     __tablename__ = 'deadline'      deadline_id = column(integer, primary_key = true)     deadline_time = column(string, nullable = false)     deadline_description = column(string, nullable = false)      def __repr__(self):         return "deadlind(deadline_id={self.deadline_id}, "\                       "deadline_time='{self.deadline_time}', "\                       "deadline_description='{self.deadline_description}'), ".format(self=self)

question

instead of output invalid deadline id given., how can the given deadline id 'xxx' not exist output?


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