[ckan-dev] pylons/webob issue

Fri Jul 8 13:44:04 UTC 2011

On 8 July 2011 14:29, Eric Lemoine <eric.lemoine at gmail.com> wrote:
> On Fri, Jul 8, 2011 at 1:22 PM, David Read <david.read at okfn.org> wrote:
>> This question is for James really with his Pylons knowledge, but I'd
>> appreciate thoughts from others with experience in the wider open
>> source world.
>>
>> The latest version of WebOb seems to be incompatible with Pylons
>> 0.9.7. It's just a minor thing but it has broken buildbot - pylons
>> 0.9.7 imports the class Multidict from webob and Multidict has moved
>> to webob.multidict.
>
> It seems that MutiDict was removed from webob in WebOb 0.9.7, with
> isn't so recent.
>
>> For a while there has been an import of Multidict
>> into webob itself as well to cope with pylons 0.9.7, but this has just
>> been removed.
>
> Do you know where in the Pylons 0.9.7 code MultDict is imported from
> webob? I can't find it.
>
> Pylons 0.9.7 does import UnicodeMultiDict from webob though, in
> decorators / __init__.py.

Yes, this is the reference I'm meant to refer to.

> The latest WebOb release, namely WebOb
> 1.0.8, does have UnicodeMultiDict in the webob namespace. So Pylons
> does work with WebOb 1.0.8.

Yes, it's today's release of 1.1beta that is the problem - see my
original message.

> But it seems that things will change in WebOb 1.1. WebOb 1.1beta1 does
> indeed not have UnicodeMultiDict in webob. Is it what you're talking
> about?
>
>>
>> What's the best way to solve this in the short term? Options:
>>
>> 1) Ask the WebOb maintainer to put back the extra import of MultiDict
>> into webob and continue support of Pylons 0.9.7
>> 2) Fork Pylons 0.9.7 and force it to use the old version of WebOb
>> 3) Fork Pylons 0.9.7 and fix the import of Multidict from WebOb
>> 4) Upgrade to Pylons 1.0 (a fair number of small changes required)
>>
>> Background:
>> WebOb has a new maintainer Sergey Schetinin and has been releasing new
>> versions in the past couple of weeks that have been changing behaviour
>> subtley and caused a couple of buildbot failures in the past week
>> already. Today he pushed out version 1.1beta1, which buildbot uses
>> straight away because Pylons specifies in its setup.py "Web>=0.9.6.1".
>
> As a short term solution can't you just have WebOb<=1.0.8 in the
> requirements of CKAN?

That sounds like a good hack - I'll do that for now. Many thanks,

David

>
>
> Cheers,
>
> --
> Eric
>
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