Я делаю проект Flask API, и у меня проблема с обработкой исключения AssertionError. Поэтому моя программа проверяет, является ли длина указанного параметра, и вызывает ошибку AssertionError, если длина превышает лимит. Проблема в том, что обработчик ошибок выполняется два раза.
__ __ INIT. Ру
from flask_restplus import Api
from flask import Blueprint
from .main.controller.book_controller import api as book_ns
from .main.controller.category_controller import api as category_ns
from .main.exception.not_found import NotFound
blueprint = Blueprint('api', __name__)
api = Api(blueprint,
title='FLASK RESTPLUS API BOILER-PLATE WITH JWT',
version='1.0',
description='a boilerplate for flask restplus web service')
api.add_namespace(book_ns, path='/book')
api.add_namespace(category_ns, path='/category')
@api.errorhandler(NotFound)
def handle_no_result(error):
'''Return a custom not found error message and 404 status code'''
return {'message': error.message}, 404
@api.errorhandler(AssertionError)
def handle_assertion_error(error):
'''Return the assertion error message and 400 status code'''
print("&&&&&&&&&&&&&&&&&&")
return {'message': error.message}, 400
book.py (модель)
from .. import db
from sqlalchemy.schema import Sequence
from sqlalchemy.orm import validates
class Book(db.Model):
__tablename__ = 'book'
book_id = db.Column('book_id',
db.Integer,
Sequence('seq_book'),
primary_key=True)
viewable = db.Column('viewable', db.Integer)
title = db.Column('title', db.String(length=50), nullable=False)
isbn = db.Column('isbn', db.String(length=13), unique=True, nullable=False)
publication_date = db.Column('publication_date', db.Date)
presentation_month = db.Column('presentation_month', db.String(length=7))
image = db.Column('image', db.String(length=100))
category_id = db.Column('category_id', db.Integer,
db.ForeignKey('category.category_id'))
category = db.relationship('Category')
def __repr__(self):
return '<id {}>'.format(self.book_id)
def serialize(self):
return {
'book_id': int(self.book_id),
'isbn': self.isbn,
'title': self.title,
'category': self.category.serialize(),
'publication_date': self.publication_date,
'presentation_month': self.presentation_month,
'image': self.image
}
@validates('title')
def validates_title(self, key, title):
if not title:
raise AssertionError('title cannot be blank')
if len(title) > 50:
raise AssertionError(
'title length must be minor or equal to 50 characters')
@validates('isbn')
def validates_isbn(self, key, isbn):
if not isbn:
raise AssertionError('isbn cannot be blank')
if len(isbn) > 13:
raise AssertionError(
'isbn length must be minor or equal to 13 characters')
@validates('presentation_month')
def validates_presentation_month(self, key, presentation_month):
if len(presentation_month) > 7:
raise AssertionError(
'presentation_month length must be minor or equal to 7 characters'
)
@validates('image')
def validates_image(self, key, image):
if len(image) > 100:
raise AssertionError(
'image length must be minor or equal to 100 characters')
Таким образом, я получаю сообщение об ошибке исключения в консоли, она печатает два раза «&&&&&&&&&&&&&&&&&» и отправляет код состояния 500, а не de 400. Я думаю, что он выдает код ошибки 500, потому что он возвращает два раза return {'message': error.message}, 400 , Я понятия не имею, как решить эту проблему.
--- EDIT -----------------------------
Исключение, возвращаемое в консоли:
&&&&&&&&&&&&&&&&&&
&&&&&&&&&&&&&&&&&&
127.0.0.1 - - [31/May/2019 11:21:53] "POST /book/ HTTP/1.1" 500 -
Traceback (most recent call last):
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 2328, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 2314, in wsgi_app
response = self.handle_exception(e)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask_restplus\api.py", line 583, in error_router
return original_handler(e)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1760, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\_compat.py", line 36, in reraise
raise value
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 2311, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1834, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask_restplus\api.py", line 583, in error_router
return original_handler(e)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1737, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\_compat.py", line 36, in reraise
raise value
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1832, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1818, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask_restplus\api.py", line 325, in wrapper
resp = resource(*args, **kwargs)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\views.py", line 88, in view
return self.dispatch_request(*args, **kwargs)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask_restplus\resource.py", line 44, in dispatch_request
resp = meth(*args, **kwargs)
File "C:\Users\albert_lazaro\Documents\Projects\Generetis\generetis-backend-flask\app\main\controller\book_controller.py", line 33, in post
return save_new_book(data=data)
File "C:\Users\albert_lazaro\Documents\Projects\Generetis\generetis-backend-flask\app\main\service\book_service.py", line 28, in save_new_book
viewable=0)
File "<string>", line 4, in __init__
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\orm\state.py", line 441, in _initialize_instance
manager.dispatch.init_failure(self, args, kwargs)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\util\langhelpers.py", line 68, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\util\compat.py", line 129, in reraise
raise value
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\orm\state.py", line 438, in _initialize_instance
return manager.original_init(*mixed[1:], **kwargs)
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\ext\declarative\base.py", line 836, in _declarative_constructor
setattr(self, k, kwargs[k])
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\orm\attributes.py", line 262, in __set__
instance_state(instance), instance_dict(instance), value, None
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\orm\attributes.py", line 822, in set
state, dict_, value, old, initiator
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\orm\attributes.py", line 830, in fire_replace_event
state, value, previous, initiator or self._replace_token
File "C:\Users\albert_lazaro\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\orm\util.py", line 168, in set_
return validator(state.obj(), key, value)
File "C:\Users\albert_lazaro\Documents\Projects\Generetis\generetis-backend-flask\app\main\model\book.py", line 52, in validates_isbn
'isbn length must be minor or equal to 13 characters')
AssertionError: isbn length must be minor or equal to 13 characters