[Kde-pim] Re: Nepomukfeeders duplicate all data

[Christian Mollekopf]

On Tue, 10 May 2011 16:36:27 +0200, Christian Mollekopf  
<chrigi_1 at fastmail.fm> wrote:

> Hi,
>
> as already mentioned previously there is a problem with the nepomuk fast
> classes in the feederagents.
>
> Unfortunately this affects all nepomuk-feeders we have and causes them to
> duplicate all properties (summary, description, icon, etc.),
> everytime the akonadi item is updated.
>
> I think this is a rather critical issue and has to be fixed for the first
> release.
>
> As a quick fix i propose that we simply remove the old statement directly
> using:
>
> Soprano::Model::removeAllStatements( resUri, propUri, Soprano::Node() );
>
> before adding the new statement using the NepomukFast classes.
>

I revise my proposal, we should just use the normal Resource api, at least  
for the calendar and contacts feeders.
Especially the contacts feeder has loads of addProperty calls and i  
believe it would be easier to just switch the whole classes to
Nepomuk::Resource. (Nepomuk::Resource is supposed to check if the value is  
already existing and avoid the duplication)

The email feeder would probably suffer the most from the reduced  
performance, and has the base classes copied anyways,
so we can easily fix the few addProperty calls with a  
Soprano::Model::removeAllStatements( resUri, propUri, Soprano::Node() );
call.

If we could even postpone the release of some of these feeders until the  
dms is available, even better.

>
> Of course that is ugly as hell, but at least we don't fill the nepomuk
> database with loads of duplicated info.
>
> But we will need a proper replacement using the new DatamanagementService
> which will be in kde-runtime as of 4.7,
> which means replacing the usage of the NepomukFast classes with the DMS.
>
>
> If there are no objections I will start fixing the existing feeders with
> the aforementioned workaround.
>
> Cheers,
>
> Chris
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