[ckan-dev] Function called on resource update

Thu Apr 27 15:21:49 UTC 2017

Hi Lucia,

this seems like a perfect case for the IDomainObjectModification interface (
http://docs.ckan.org/en/latest/extensions/plugin-interfaces.html#ckan.plugins.interfaces.IDomainObjectModification
).

You can implement that in your extension and every time a resource is
updated, the notify() method is called. E.g. the datastore part in CKAN
core uses that:
https://github.com/ckan/ckan/blob/af2f061fdd08219d5070415be118d6063d38341f/ckanext/datastore/plugin.py#L130
You then have to check that the entity is acutally a resource with
something like isinstance(entity, model.Resource)
and that the operation is "changed" (operation ==
model.domain_object.DomainObjectOperation.changed).

Once that is clear, then you'll have to check if the allowed_users field
has changed (I guess the value should be in entity.allowed_users).

If this seems like overkill, then maybe using the IResourceController
interface with the after_update method is the better choice (
http://docs.ckan.org/en/latest/extensions/plugin-interfaces.html#ckan.plugins.interfaces.IResourceController.after_update
)

Hope this helps.

- Stefan

On Thu, Apr 27, 2017 at 3:33 PM, <lucia.espona at wsl.ch> wrote:

> Dear all
>
> I would like to know how to define a function that will be called when a
> resource is updated. The function will need to know which information
> (field, new value, old value) was changed.
> What would be the best way to do this? I am using scheming and was
> thinking of using a validator.
>
> Here is the context: in my ckanext-restricted extension, I would like that
> the user is notified by mail when he/she is granted access to access a
> restricted resource. This happens when the owner updates a field called
> "allowed_users" in the resource metadata. It is important that only the new
> added users get a mail.
>
> Any help will be appreciated :)
>
> Best regards,
> Lucia
>
>
> _________________________________________________________
> Dr. Lucia Espona Pernas
>
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