[Nepomuk] Issue with removing resources

[George Goldberg]

On 6 August 2010 09:47, Sebastian Trüg <trueg at kde.org> wrote:
> On 08/05/2010 07:45 PM, George Goldberg wrote:
>> I'm having a bit of a problem with Nepomuk::Resource. The context is this:
>>
>> I have a query, using queryserviceclient (in this case, for all PIMO:Person).
>> I also have a QList<PersonObject> where PersonObject is a class
>> encapsulating a Nepomuk::Resource referencing a PIMO:Person.
>>
>> Whenever the queryserviceclient query emits it's newEntries() signal,
>> a new PersonObject is created using that Resource and appended to the
>> list.
>>
>> This is all fine so far.
>>
>> However, when the queryserviceclient query emits entriesRemoved(), I
>> iterate over the list of PersonObjects, getting the Nepomuk::Resource
>> from each one and comparing its uri with the one from
>> entriesRemoved().
>>
>> This would be fine too, except that if the resource concerned has been
>> removed altogether from the Nepomuk database, the Nepomuk::Resource
>> instance for it in my list has magically had its uri property set to
>> ""
>>
>> This means that when doing the comparison, it never matches.
>>
>> Is this a bug? If not, can anyone suggest how I should be doing this instead?
>
> This is not a bug. It is a feature. :P
> Seriously, that is why entriesRemoved does not return Result objects but
> QUrls: the Resources are no longer valid after having been deleted.
>
> One solution would be your own hash of resource uris to results.

OK, I'll do that for now.

Thanks,

George