When importing a CSV file for a certain publisher, records don't come up on the search index. After some investigation this has tunrn out to be caused by the records being deleted. We need to investigate if this was caused by the import or just made by the users.

Various stuff related with release 1.7:

• Review patches sent to the release branch
• Regularly update TDH with latest changes
• write changelog, announce email, etc
• ...

I've been writing a doc with different issues regarding INSPIRE support in CKAN. It is mostly done, except for some sections on CSW support. Depends on #2359

A simple way for geocoding place names would be very useful, e.g in the spatial search, defining a geometry for a dataset (on the form or bulk)

US-0a

Do not show failed preview with red-bar (esp when just empty datastore ...)

• Data Viewer checks if datastore is empty nad falls back to ther options if emtpy
• DataStore? enabled is off by default and only turned on either explicitly by user or by DataStorer? on successful store ...

Loading/showing error reports

This chap tried to use the API to add a dataset to a group and got the uninformative message 'Access denied':

​http://lists.okfn.org/pipermail/ckan-dev/2012-May/002229.html

The problem was he didn't have access to the group. A message like 'You don't have access to the group "LODcloud"' would have been clearer.

Please see these GitHub? issues:

​https://github.com/okfn/recline/issues/130

​https://github.com/okfn/recline/issues/131

There are some areas where the documentation could use some improvement and it would be good to have it available for 1.7.1.

• Add an introduction to harvesting support
• Add an introduction to CSW support
• Better upgrade docs: Some users suggested improvements to the upgrade docs on the list [1]. Also we should mention how the upgrade would work for point point releases
• Source install: see #2406

[1] ​http://lists.okfn.org/pipermail/ckan-dev/2012-May/002178.html

Requests (​http://python-requests.org) is really useful to deal with http requests and saves a lot of time.

I propose we include it as a requirement for the tests for the time being, and even for core if necessary at a later stage.

Depends on #2639

The checks to show or not the button need to be updated for the latest datastore version

Extension hooking into the edit and create methods of the IPackageController interface receive the package object. This may not include all the fields that came from the form. The new extension points will pass the validated data_dict so extensions can have access to it

nav_named_link won't include the nice icon even when passing the icon keyword param.

This proposal is to discuss adding a new API for proxying certain spreadsheet data via JSON-P to make it possible to build simple browser apps directly off the API.

See the attached proposal for information.

Summarise final set of requirements for this and finish development and test. Estimated 10 working days.

Can we finish this ready for release on data hub and CKAN Hosted.

Basic websotre exists but this may be not what is described yet.

CKAN provides a rich API for the data itself, allowing users to query retrieve and use data instantly from datasets in CKAN without needing to download or process it first.

Requires change to celeryd. Estimated 4 weeks.

How much effort will this be to be ready to use?

Need to write custom harvesters for each client. Is it worth having one for data hub?

Finish any work out standing on web store preview extension to be able to package and release.

Ref James and I going through existing features and trying to mention any polishing that needed doing to get exiting features ready for release with projects such as CKAN hosted.

Tick and cross aren't clear enough. Propose:

• Icon for downloadability (nothing if absent ...(?))
• Icon for open license? (Need something if closed ...)

Cost: 2h (?)

WUI:

• Editable as part of package or separately? (e.g. like authz)
• Do we normalize to only one type name of the pair?
• Do we allow create of relationship from both ends (e.g. only from dependency to dependent or either way?)

A package discussion page is like a wikipedia discussion page: an editable free text page for people to have discussion/post comments about a given package.

It provides a way for people to make suggestions about a package without needing access to main package.

Use case: new package

1. An external front-end system provides a web page with a list of packages. Each package has the option to edit it or and there is also a button to create a new package.

2. User: clicks 'new package'.

3. CKAN presents the package/new form to the user.

4. (After a couple of previews) User: clicks 'commit'.

5. Notification message goes from CKAN to the front-end detailing the new package.

6. The user is redirected back to the front-end web page displaying the list of packages, which contains the new one.

The notification message (step 5) has to get through to the front-end that the new package is created before the redirect (step 6). This suggests that the message sending needs to be *synchronous*, i.e. acknowledged by the front-end, before CKAN redirects the user to the front-end package listing page (step 6).

In addition, this use case suggests the front-end listens for package notifications, to save another call to CKAN to get the package details, before the displaying the list of packages. If this isn't possible (see next use case) and it must listen for revision notifications instead, then perhaps it is worth including the full package details in the payload for the revision notification message. Would there be a problem with such a large message in the next use case, with 100 packages?

Use case: CKAN imports packages

1. CKAN administrator runs a script that adds 100 new packages into CKAN.

2. CKAN sends notification message to front-end to report the new packages/revisions.

3. Knowing there are new revisions, the front-end queries the CKAN revision interface to get the list of new packages.

4. The front-end queries CKAN for each new package one-by-one.

5. A new user request to the front-end will include the info about the new packages.

The package addition could be achieved in 1 revision, 100 revisions or some compromise:

• If it is 1 revision then potentially there are problems displaying the long list of packages in the 'recent changes'.

• If it is 100 revisions, then the notification webhook would be called 100 times, which creates unnecessary load on the front-end. Suppose each Webhook call-back (step 2) triggers the front-end to make a call to CKAN to get the latest revisions (step3), in this case it would make 100 calls, most of them fruitless, causing unnecessary load on CKAN.

This use case suggests a bulk import of packages should go into one revision, and therefore generate one revision notification message and 100 package notification messages. The front-end client should listen to only revision messages.

(in the same way that we can refer to packages in the API by ID as well as name.)

As a

client of CKAN

I want to

link to a package page in the UI, referring to it by ID

Need to research what can easily be done to improve CKAN packages in the search rankings.

Comments from Glen Barnes:

We've been pretty successful at SEO without even really trying (see ​http://www.google.co.nz/search?client=safari&rls=en&q=auckland+google+transit+feed&ie=UTF-8&oe=UTF-8&redir_esc=&ei=dsYSTOzJLs2eceuZiI8I as an example). This to me is key. If we are to make data available it has to be findable which is the main reason for a catalogue. There are probably things we should be doing on CKAN like using slugged urls (​http://www.ckan.net/package/ascoe -> ​http://www.ckan.net/package/ascoe/atmospheric-chemistry-studies-in-the-oceanic-environment), setting the H1 tag correctly ("Atmospheric Chemistry Studies in the Oceanic Environment" on the example above). Some basic SEO 101 on page optimisations.

As a

SOLR instance

I want to

keep my search index of CKAN packages up-to-date

Implementation

• Using asynchronous event notifications
• Running in a separate process to CKAN

On ckan.net there are plenty of packages (and indeed their tags) with the word 'statistic' in them, but no packages turn up when you search for it:

​http://ckan.net/package/search?q=statistic&search=Search+Packages+%C2%BB

(Using Postgres full text search)

Currently there's a nice legend titled "Package Listing Key" that appears in right side of "Browse Packages" results. The same key should show on other search results like when searching for a tag.

When the API returns any response it should always retunr JSON. For example a 404 response should return something like

{'status': 404, 'message': 'package somename not found'}

When errors are encountered when creating a package:

{'status': nnn, 'message': 'Validation Errors', 'errors':['description':'name cannot be
blank', 'description':'license code must be an integer']}

Not authorised:

{'status': 503, 'message': 'You are not authorised to create this package.'}

The reason being that screeds of html coming back in the response just makes it harder to debug and understand. Having the proper error codes/messages means that you can see why your package was not created.

At the moment, some pages within CKAN tend to load slowly. We should create a profiling setup in which we can measure response times for complete requests and individual methods calls.

This could be used to identify bottlenecks and find an appropriate caching or tuning strategy to improve CKAN performance.

NB: We should also agree on a maximum request latency.

TODO: Read up on all those QoS tickets to avoid overlapping efforts.

As a

user browsing a CKAN package which has a resource in a bad format

I want to

be alerted to the possibility of scraping it on scraperwiki

Implementation

This should be done in a CKAN extension. It should appear in a side-bar on the package read page.

If the package does not have a resource with scraperwiki.com in the url, then it displays this message:

Title: Scrape it
Image: (Scraperwiki dumper truck)
Body text: Could this data be in a better format? Why not use Scraperwiki to extract data from tables, Excel or PDF for everyone's benefit? You can ​request this data is scraped or even ​write the scraper yourself.

Requirements:

• cater naturally for multiple packages with multiple resources
• international encoding
• large number of packages

Here's the trace:

[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197] Error - <type 'exceptions.IndexError'>: list index out of range
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197] mod_wsgi (pid=6195): Exception occurred processing WSGI script '/home/okfn/var/srvc/si.ckan.net/py
env/bin/si.ckan.net.py'.
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197] Traceback (most recent call last):
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/paste/cascade.py", line 
130, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return self.apps[-1](environ, start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/paste/registry.py", line
 375, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     app_iter = self.application(environ, start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/repoze/who/middleware.py
", line 107, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     app_iter = app(environ, wrapper.wrap_start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/pylons/middleware.py", l
ine 214, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     self.app, new_environ, catch_exc_info=True)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/pylons/util.py", line 94
, in call_wsgi_application
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     app_iter = application(environ, start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/weberror/errormiddleware
.py", line 156, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return self.application(environ, start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/beaker/middleware.py", l
ine 73, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return self.app(environ, start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/beaker/middleware.py", l
ine 152, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return self.wrap_app(environ, session_start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/routes/middleware.py", l
ine 130, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     response = self.app(environ, start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/pylons/wsgiapp.py", line
 125, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     response = self.dispatch(controller, environ, start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/pylons/wsgiapp.py", line
 324, in dispatch
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return controller(environ, start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/src/ckan/ckan/lib/base.py", line 73, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return WSGIController.__call__(self, environ, start_response)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/pylons/controllers/core.
py", line 221, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     response = self._dispatch_call()
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/pylons/controllers/core.
py", line 172, in _dispatch_call
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     response = self._inspect_call(func)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/pylons/controllers/core.
py", line 107, in _inspect_call
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     result = self._perform_call(func, args)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/pylons/controllers/core.
py", line 60, in _perform_call
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return func(**args)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/src/ckan/ckan/controllers/error.py", line 32, in doc
ument
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     ckan_template = render('error_document_template.html')
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/src/ckan/ckan/lib/base.py", line 38, in render
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return render_template()
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/src/ckan/ckan/lib/base.py", line 36, in render_templ
ate
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return literal(stream.render(method=method, encoding=None))
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/core.py", line 18
3, in render
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return encode(generator, method=method, encoding=encoding, out=out)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/output.py", line 
57, in encode
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     return _encode(''.join(list(iterator)))
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/output.py", line 339, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for kind, data, pos in stream:
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/output.py", line 670, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for kind, data, pos in stream:
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/output.py", line 771, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for kind, data, pos in chain(stream, [(None, None, None)]):
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/output.py", line 586, in __call__
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for ev in stream:
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/core.py", line 288, in _ensure
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for event in stream:
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/template/base.py", line 618, in _include
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for event in tmpl.generate(ctxt, **vars):
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/template/base.py", line 618, in _include
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for event in tmpl.generate(ctxt, **vars):
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/template/base.py", line 605, in _include
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for event in stream:
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/template/markup.py", line 327, in _match
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for event in stream:
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/template/base.py", line 545, in _flatten
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for kind, data, pos in stream:
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/filters/i18n.py", line 177, in _generate
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     for event in msgbuf.translate(gettext(msgbuf.format())):
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/filters/i18n.py", line 1029, in translate
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     parts = parse_msg(string)
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]   File "/home/okfn/var/srvc/si.ckan.net/pyenv/lib/python2.5/site-packages/genshi/filters/i18n.py", line 1143, in parse_msg
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197]     parts.append((stack[-1], string))
[Wed Aug 18 11:10:19 2010] [error] [client 89.212.104.197] IndexError: list index out of range

ckan: 1e403927f2bb (metastable) genshi: 0.6 lang: slovenian

On today's buildbot: ​http://buildbot.okfn.org/builders/buildbot-test/builds/201

2 failures about ascii (ignore other 2)

• Create test data on visible ckan
• Discuss with JF

John did this a while ago.

Either CKAN writes to SOLR and Drupal reads from SOLR, or CKAN writes to SOLR and Drupal reads SOLR via CKAN API (so search resource locations are unaffected).

Investigate exception:

URL: http://ckan.net/revision/diff/dbtune-audioscrobbler?diff=66a47b9e-232a-4838-8674-66fa1a5c76e1&oldid=a99c98be-767a-4e49-9025-2472b2d18b9c
Module weberror.errormiddleware:162 in __call__
<<              __traceback_supplement__ = Supplement, self, environ
                   sr_checker = ResponseStartChecker(start_response)
                   app_iter = self.application(environ, sr_checker)
                   return self.make_catching_iter(app_iter, environ, sr_checker)
               except:
>>  app_iter = self.application(environ, sr_checker)
Module beaker.middleware:73 in __call__
<<                                                     self.cache_manager)
               environ[self.environ_key] = self.cache_manager
               return self.app(environ, start_response)
>>  return self.app(environ, start_response)
Module beaker.middleware:152 in __call__
<<                          headers.append(('Set-cookie', cookie))
                   return start_response(status, headers, exc_info)
               return self.wrap_app(environ, session_start_response)
           
           def _get_session(self):
>>  return self.wrap_app(environ, session_start_response)
Module routes.middleware:130 in __call__
<<                  environ['SCRIPT_NAME'] = environ['SCRIPT_NAME'][:-1]
               
               response = self.app(environ, start_response)
               
               # Wrapped in try as in rare cases the attribute will be gone already
>>  response = self.app(environ, start_response)
Module pylons.wsgiapp:125 in __call__
<<          
               controller = self.resolve(environ, start_response)
               response = self.dispatch(controller, environ, start_response)
               
               if 'paste.testing_variables' in environ and hasattr(response,
>>  response = self.dispatch(controller, environ, start_response)
Module pylons.wsgiapp:324 in dispatch
<<          if log_debug:
                   log.debug("Calling controller class with WSGI interface")
               return controller(environ, start_response)
           
           def load_test_env(self, environ):
>>  return controller(environ, start_response)
Module ckan.lib.base:73 in __call__
<<          # available in environ['pylons.routes_dict']    
               try:
                   return WSGIController.__call__(self, environ, start_response)
               finally:
                   model.Session.remove()
>>  return WSGIController.__call__(self, environ, start_response)
Module pylons.controllers.core:221 in __call__
<<                  return response(environ, self.start_response)
               
               response = self._dispatch_call()
               if not start_response_called:
                   self.start_response = start_response
>>  response = self._dispatch_call()
Module pylons.controllers.core:172 in _dispatch_call
<<              req.environ['pylons.action_method'] = func
                   
                   response = self._inspect_call(func)
               else:
                   if log_debug:
>>  response = self._inspect_call(func)
Module pylons.controllers.core:107 in _inspect_call
<<                        func.__name__, args)
               try:
                   result = self._perform_call(func, args)
               except HTTPException, httpe:
                   if log_debug:
>>  result = self._perform_call(func, args)
Module pylons.controllers.core:60 in _perform_call
<<          """Hide the traceback for everything above this method"""
               __traceback_hide__ = 'before_and_this'
               return func(**args)
           
           def _inspect_call(self, func):
>>  return func(**args)
Module ckan.controllers.revision:119 in diff
<<          c.revision_to = model.Session.query(model.Revision).get(
                   request.params.getone('diff'))
               diff = pkg.diff(c.revision_to, c.revision_from)
               c.diff = diff.items()
               c.diff.sort()
>>  diff = pkg.diff(c.revision_to, c.revision_from)
Module ckan.model.package:340 in diff
<<                              display_id = to_obj_rev.tag.name
                               elif obj_class.__name__ == 'PackageExtra':
                                   display_id = to_obj_rev.key
                               else:
                                   display_id = related_obj_id[:4]
>>  display_id = to_obj_rev.key
AttributeError: 'NoneType' object has no attribute 'key'
CGI Variables
AUTH_TYPE	'cookie'
DOCUMENT_ROOT	'/htdocs'
GATEWAY_INTERFACE	'CGI/1.1'
HTTP_ACCEPT	'application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5'
HTTP_ACCEPT_CHARSET	'ISO-8859-1,utf-8;q=0.7,*;q=0.3'
HTTP_ACCEPT_ENCODING	'gzip'
HTTP_ACCEPT_LANGUAGE	'en-US,en;q=0.8'
HTTP_CACHE_CONTROL	'max-age=0'
HTTP_COOKIE	'__utmz=27730403.1281000628.1.6.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=ckan; auth_tkt="e919c7bb40f890a0184ed7be95465e1a4c6d130bhttp://pudo.org/!"; auth_tkt="e919c7bb40f890a0184ed7be95465e1a4c6d130bhttp://pudo.org/!"; __utma=27730403.1381387877.1281962773.1282248244.1282250173.11; __utmc=27730403; __utmb=27730403.6.10.1282250173'
HTTP_HOST	'ckan.net'
HTTP_REFERER	'http://ckan.net/package/history/dbtune-audioscrobbler'
HTTP_USER_AGENT	'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_4; en-US) AppleWebKit/534.6 (KHTML, like Gecko) Chrome/6.0.490.1 Safari/534.6'
PATH	'/usr/local/bin:/usr/bin:/bin'
PATH_INFO	'/revision/diff/dbtune-audioscrobbler'
PATH_TRANSLATED	'/home/okfn/var/srvc/ckan.net/pyenv/bin/ckan.net.py/revision/diff/dbtune-audioscrobbler'
QUERY_STRING	'diff=66a47b9e-232a-4838-8674-66fa1a5c76e1&oldid=a99c98be-767a-4e49-9025-2472b2d18b9c'
REMOTE_ADDR	'92.226.62.168'
REMOTE_PORT	'55102'
REMOTE_USER	'http://pudo.org/'
REMOTE_USER_TOKENS	['']
REQUEST_METHOD	'GET'
REQUEST_URI	'/revision/diff/dbtune-audioscrobbler?diff=66a47b9e-232a-4838-8674-66fa1a5c76e1&oldid=a99c98be-767a-4e49-9025-2472b2d18b9c'
SCRIPT_FILENAME	'/home/okfn/var/srvc/ckan.net/pyenv/bin/ckan.net.py'
SCRIPT_URI	'http://ckan.net/revision/diff/dbtune-audioscrobbler'
SCRIPT_URL	'/revision/diff/dbtune-audioscrobbler'
SERVER_ADDR	'10.226.226.118'
SERVER_ADMIN	'[no address given]'
SERVER_NAME	'ckan.net'
SERVER_PORT	'80'
SERVER_PROTOCOL	'HTTP/1.1'
SERVER_SIGNATURE	'<address>Apache/2.2.9 (Debian) mod_wsgi/2.5 Python/2.5.2 Server at ckan.net Port 80</address>\n'
SERVER_SOFTWARE	'Apache/2.2.9 (Debian) mod_wsgi/2.5 Python/2.5.2'
WSGI Variables
application	<beaker.middleware.CacheMiddleware object at 0xbb528cc>
beaker.cache	<beaker.cache.CacheManager object at 0xbb528ec>
beaker.get_session	<bound method SessionMiddleware._get_session of <beaker.middleware.SessionMiddleware object at 0xbb5286c>>
beaker.session	{'_accessed_time': 1282252047.603267, '_creation_time': 1282252047.603267}
mod_wsgi.application_group	'ckan.net|'
mod_wsgi.callable_object	'application'
mod_wsgi.listener_host	''
mod_wsgi.listener_port	'80'
mod_wsgi.process_group	''
mod_wsgi.reload_mechanism	'0'
mod_wsgi.script_reloading	'1'
mod_wsgi.version	(2, 5)
paste.cookies	(<SimpleCookie: __utma='27730403.1381387877.1281962773.1282248244.1282250173.11' __utmb='27730403.6.10.1282250173' __utmc='27730403' __utmz='27730403.1281000628.1.6.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=ckan' auth_tkt='e919c7bb40f890a0184ed7be95465e1a4c6d130bhttp://pudo.org/!'>, '__utmz=27730403.1281000628.1.6.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=ckan; auth_tkt="e919c7bb40f890a0184ed7be95465e1a4c6d130bhttp://pudo.org/!"; auth_tkt="e919c7bb40f890a0184ed7be95465e1a4c6d130bhttp://pudo.org/!"; __utma=27730403.1381387877.1281962773.1282248244.1282250173.11; __utmc=27730403; __utmb=27730403.6.10.1282250173')
paste.parsed_querystring	([('diff', '66a47b9e-232a-4838-8674-66fa1a5c76e1'), ('oldid', 'a99c98be-767a-4e49-9025-2472b2d18b9c')], 'diff=66a47b9e-232a-4838-8674-66fa1a5c76e1&oldid=a99c98be-767a-4e49-9025-2472b2d18b9c')
paste.registry	<paste.registry.Registry object at 0xf702aec>
paste.throw_errors	True
pylons.action_method	<bound method RevisionController.diff of <ckan.controllers.revision.RevisionController object at 0xf6eaf0c>>
pylons.controller	<ckan.controllers.revision.RevisionController object at 0xf6eaf0c>
pylons.environ_config	{'session': 'beaker.session', 'cache': 'beaker.cache'}
pylons.pylons	<pylons.util.PylonsContext object at 0xf6eaa8c>
pylons.routes_dict	{'action': u'diff', 'controller': u'revision', 'id': u'dbtune-audioscrobbler'}
repoze.who.identity	<repoze.who identity (hidden, dict-like) at 280815340>
repoze.who.logger	<logging.Logger instance at 0xbcdfccc>
repoze.who.plugins	{'openid': <OpenIdIdentificationPlugin 196612236>, 'auth_tkt': <AuthTktCookiePlugin 198048140>}
routes.route	<routes.route.Route object at 0xbbc44cc>
routes.url	<routes.util.URLGenerator object at 0xf5e55ec>
webob._parsed_query_vars	(GET([('diff', '66a47b9e-232a-4838-8674-66fa1a5c76e1'), ('oldid', 'a99c98be-767a-4e49-9025-2472b2d18b9c')]), 'diff=66a47b9e-232a-4838-8674-66fa1a5c76e1&oldid=a99c98be-767a-4e49-9025-2472b2d18b9c')
webob.adhoc_attrs	{'language': 'en-us'}
wsgi process	'Multi process AND threads (?)'
wsgi.file_wrapper	<built-in method file_wrapper of mod_wsgi.Adapter object at 0xfe0b0b0>
wsgiorg.routing_args	(<routes.util.URLGenerator object at 0xf5e55ec>, {'action': u'diff', 'controller': u'revision', 'id': u'dbtune-audioscrobbler'})

We don't want /api to be an HTML page, but rather provide information about the API in a JSON structure.