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Date: Wed, 9 May 2012 06:54:34 +0200
Message-ID: <CAJhx5RfkStjr88_Sg73Fw7jCBUt1EChLbiv4swyz7qF4wOx...@mail.gmail.com>
Subject: Re: Colander: unflatten invalid.asdict() error
From: Robert Forkel <xrotw...@googlemail.com>
To: pylons-discuss@googlegroups.com
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you may want to have a look at cornice [1]. Among other things it
helps with validating json input via colander and handling resulting
errors.
regards,
robert

[1] http://cornice.readthedocs.org/en/latest/index.html

On Wed, May 9, 2012 at 3:52 AM, anh le <anh...@gmail.com> wrote:
> Hi all,
>
> I'm using colander to validate json input for my api. To report the
> invalid input to user
> I try to =A0unflatten the invalid.asdict()
>
> However if the invalid input located in the place other than the first
> place in a
> sequence the unflatten fails.
>
> Here is the snipets: (as =A0https://gist.github.com/2641011 )
>
> import colander
>
> class Phone(colander.MappingSchema):
> =A0 =A0location =3D colander.SchemaNode(colander.String(),
> =A0 =A0 =A0 =A0 =A0 =A0validator=3Dcolander.OneOf(['home', 'work']))
> =A0 =A0number =3D colander.SchemaNode(colander.String())
>
> class Phones(colander.SequenceSchema):
> =A0 =A0phone =3D Phone()
>
> class User(colander.MappingSchema):
> =A0 =A0name =3D colander.SchemaNode(colander.Str())
> =A0 =A0phones =3D Phones()
>
> user =3D User()
>
> d1 =3D {'name': 'jim',
> =A0 =A0 =A0'phones': [{'location': 'office', 'number': '12343'},
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 {'location': 'home', 'number': '33131'}]
> }
>
> try:
> =A0 =A0user.deserialize(d1)
> except colander.Invalid as invalid:
> =A0 =A0print user.unflatten(invalid.asdict())
>
> # result:
> # {'phones': [{'location': u'"office" is not one of home, work'}]}
>
> # place invalid location as second position
> d2 =3D {'name': 'bob',
> =A0 =A0 =A0'phones': [{'location': 'home', 'number': '1234'},
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 {'location': 'office', 'number': '33131'}=
]
> }
>
> try:
> =A0 =A0user.deserialize(d2)
> except colander.Invalid as invalid:
> =A0 =A0print user.unflatten(invalid.asdict())
>
> # result:
> # ...
> # /opt/env/lib/python2.7/site-packages/colander/__init__.py", line
> 816, in unflatten
> # =A0 =A0 return [mapstruct[str(index)] for index in xrange(len(mapstruct=
))]
> # KeyError: '0'
> #
>
> How to handle this error or is there a better way to show the error in
> a api (json) validation?
>
> thanks,
>
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