Review Request: Stop DataContainer from discarding multiple values for a single key.

[John Layt]

> On 2010-06-05 09:29:07, Marco Martin wrote:
> > good catch.
> > could also have something to do wwith https://bugs.kde.org/show_bug.cgi?id=240462  ?

Just tested that scenario, but I'm afraid it doesn't fix it.  I'll try look at that, and there's another report duplicated entries and failures to update.  I also think the Event details displayed need a bit of polish.


- John


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On 2010-06-05 00:08:34, John Layt wrote:
> 
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> 
> (Updated 2010-06-05 00:08:34)
> 
> 
> Review request for Plasma.
> 
> 
> Summary
> -------
> 
> If a DataEngine implementation uses QHash::insertMulti() to try return multiple values for a key, the DataContainer discards the multiple values and only returns a single value to the client.
> 
> A simplified example showing where 2 holidays occurring on the same date need to be treated as separate data entities:
> 
>         Plasma::DataEngine::Data holidays;
>         holidays.insertMulti("2010-06-01", "A national public holiday");
>         holidays.insertMulti("2010-06-01", "A minor religious holiday");
>         setData(request, holidays);
> 
> What gets returned to the client is only the second value for the minor religious holiday, so the public holiday doesn't appear on the calendar.
> 
> This is because the call to setData() loops through each value in the passed in DataEngine::Data and calls DataContainer::setData(), which inserts each value into a new DataEngine::Data, in the process discarding any previous multiple values.
> 
> This patch uses insertMulti() in the DataContainer::setData() to fix this.  I can't think of anything this would break by changing the behaviour to retain any multiples, they can only get there in the first place by the DataEngine explicitly calling insertMulti() so I think it's safe to assume the coder wants them kept.
> 
> The alternative would be to create new DataEngine::setMultiData() and DataContainer::setMultiData() methods.
> 
> 
> Diffs
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> 
>   /trunk/KDE/kdelibs/plasma/datacontainer.cpp 1134380 
> 
> Diff: http://reviewboard.kde.org/r/4235/diff
> 
> 
> Testing
> -------
> 
> Without the patch, holidays disappear between the calendar data engine and the calendar plasmoid.  With the patch all the holidays make it and can be treated differently according to type.
> 
> 
> Thanks,
> 
> John
> 
>