[ckan-dev] Conditional validation on custom Datasets

Wed Mar 5 10:46:23 UTC 2014

Hi David

Thank you for replying, I understand now why the package is validated
as well. I took your example but unfortunately when I call the
resource_create in the manner you have, I get a recursion error. CKAN
will warn that I am calling the logic action direct...

            def warn(context, data_dict):
                log.critical('Action `%s` is being called directly '
                             'all action calls should be accessed via '
                             'logic.get_action' % action_name)

... and then proceed to call my_resource_create anyway.

I can put the core CKAN resource_create code in mine, which isn't
ideal. Do you know if there's any interface like IAction (or if
IAction does it too) that allows me to chain logic calls instead of
overriding?

If I work something out, I'll update here.

Thanks
Richard

On 4 March 2014 14:08, David Raznick <david.raznick at okfn.org> wrote:
> Hello
>
> The reason that it is validated here is that people can write
> validators than depend on both resource and dataset data at the same
> time.  i.e a validator that states then can be no more than 4
> resources in a dataset.
> So all the package data has to be validated together or we could break
> people code.
>
>
> For this case I think you will have to use an IAction extension point
> to override resource_create.  It is recommended you call the original
> function from your overriden one like this:
>
> https://github.com/okfn/ckanext-ecportal/blob/master/ckanext/ecportal/logic.py#L401
>
> Your case looks difficult though and you may have to override the
> whole function.  You "could" just call the original and catch the
> KeyError but that is clearly not nice.  Or you can put in the context
> a new lenient schema for this case.  A schema in the context. i.e
> context['schema'] = {new schema}  will override your defined
> package_update one making sure no errors could ever happen in the
> package_update.
>
> So your code would look somehting like
>
> import ckan.logic as logic
>
> def my_resource_create(context, data_dict):
>     context['schema'] = new_lenient_schema
>     return logic.action.create.resource_create(context, data_dict)
>
> class YourPlugin(p.SingletonPlugin):
>     p.implements(p.IActions)
>
>     def get_actions(self):
>         return {
>             'resource_create': my_resource_create,
>         }
>
>
> Hope that helps
>
> David
>
> On 4 March 2014 12:39, Richard Claydon <richard at icdw.co.uk> wrote:
>> Hi
>>
>> I have a requirement to not validate custom data on a package when a
>> package is created, only to validate when the package is updated. I
>> have achieved this by creating a custom form derived from
>> DefaultDatasetForm, adding the relevant rules in
>> create_package_schema() and update_package_schema().
>>
>> So far so good.
>>
>> The problem I am currently facing is, when I add a resource, the
>> package is validated because the package_update action is called
>> within the resource_create function inside actions/create.py.
>> Unfortunately the exception handler in resource_create assumes the
>> problem is with the resources and an unhandled KeyError exception is
>> thrown. Here is the code in CKAN.
>>
>>     try:
>>         context['defer_commit'] = True
>>         context['use_cache'] = False
>>         _get_action('package_update')(context, pkg_dict)
>>         context.pop('defer_commit')
>>     except ValidationError, e:
>>         errors = e.error_dict['resources'][-1] # <--- assumes
>> validation error is in the resource.
>>         raise ValidationError(errors)
>>
>> My question is; can anyone suggest how I can suppress package
>> validation when a resource is added? Resource validation is fine, but
>> the "new_resource" view in CKAN by default does not include the rest
>> of the package data, so IMO that shouldn't be validated here.
>>
>> I would like to try and avoid overriding core code if possible.
>>
>> Open to suggestions!
>>
>> Thanks
>> Richard
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