Request parsing example?

[nickretallack]

Is this only for serializing responses, or can it be used for parsing requests as well? Can you add an example of this?

[sloria]

marshmallow is used for validating/deserializing input data and serializing objects. It does not itself pull values off of flask.request, but marshmallow pairs nicely with a library like webargs.

I am planning on writing up--either in an example in the marshmallow repo or in a blog post--how to use marshmallow and webargs together.

[ghost]

I'm having issues with creating an object with a Hyperlinks attribute
I get AttributeError: 'Hyperlinks' object has no attribute 'attribute'; I assume this is is because it's trying to make a Hyperlinks object although it should be auto-generated like marshmallow.URL. Any ideas?

[sloria]

@raj-kesavan Can you please provide a reproducible example to help debug your problem?

[ghost]

@sloria
Simple set up with Flask-RESTful and Flask-Marshmallow. When I navigate to /api/v1/person, I get a 500 Internal Server Error. Server logs at bottom.

class PersonSchema(ma.Schema):
    name = ma.String(required = True)
    friends = ma.Hyperlinks({
        'href': ma.AbsoluteURL('person_ep')
    })

class PersonAPI(Resource):
    def get(self):
        person, errors = PersonSchema().load({
            'name': 'Rob'
        })

api.add_resource(PersonAPI, '/api/v1/person/', endpoint = 'person_ep')

Server log

[Mon Dec 22 04:15:16 2014] [error] [client 108.162.215.69]   File "/usr/local/lib/python2.7/dist-packages/flask_restful/__init__.py", line 521, in dispatch_request
[Mon Dec 22 04:15:16 2014] [error] [client 108.162.215.69]     resp = meth(*args, **kwargs)
[Mon Dec 22 04:15:16 2014] [error] [client 108.162.215.69]   File "/var/www/html/devabacus/abacus/views.py", line 95, in get
[Mon Dec 22 04:15:16 2014] [error] [client 108.162.215.69]     'name': 'Rob'
[Mon Dec 22 04:15:16 2014] [error] [client 108.162.215.69]   File "/usr/local/lib/python2.7/dist-packages/marshmallow/schema.py", line 498, in load
[Mon Dec 22 04:15:16 2014] [error] [client 108.162.215.69]     dict_class=self.dict_class
[Mon Dec 22 04:15:16 2014] [error] [client 108.162.215.69]   File "/usr/local/lib/python2.7/dist-packages/marshmallow/fields.py", line 260, in deserialize
[Mon Dec 22 04:15:16 2014] [error] [client 108.162.215.69]     key = fields_dict[attr_name].attribute or attr_name
[Mon Dec 22 04:15:16 2014] [error] [client 108.162.215.69] AttributeError: 'Hyperlinks' object has no attribute 'attribute'

[sloria]

@raj-kesavan I see. Thank you for the clarification. I will work on a fix for the next release.