How to override error message

[llaumgui]

Hi,

I would like to override 400 error to add some information but I can't catch them with :

bp = Blueprint('api', __name__, url_prefix=f'/api/{api_path_version}')

api = Api(
    bp,
    title='SeedboxSync API',
    version=api_version,
    description='REST API providing access to the SeedboxSync database and its resources.',
    validate=True,
)

# Add namespaces
api.add_namespace(nsDownloads)
api.add_namespace(nsUploads)

from werkzeug.exceptions import BadRequest
@api.errorhandler(BadRequest)
def handle_root_exception(error):
    '''Return a custom message and 400 status code'''
    return {'message': 'What you want'}, 400

Where is my issue ?

[peter-doggart]

This is caused because of the way flask-restx handles werkzeug.exceptions, and you will likely also see differing behaviour depending on if app.config['PROPAGATE_EXCEPTIONS'] is set to true or false (it's true in flask automatically in debug/testing, and false otherwise).

If you are catching werkzeug.exceptions rather than your own custom exceptions, you need to modify the existing exception like suggested here because the api.py always reads the data field if present (and will ignore any custom outputs): #72 (comment)

@api.errorhandler(BadRequest)
def handle_validation_error(error):
    api.logger.error(error.data)
    error.data = {'my custom': 'error message'}
    return {}, 400