** Changed in: zeitgeist
Assignee: (unassigned) => Markus Korn (thekorn)
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Hard to use exclusive queries
https://bugs.launchpad.net/bugs/592599
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Status in Unity Files Place: New
Status in Zeitgeist Framework: Triaged
Bug description:
(Canonical hat on)
For Unity we want to try and group recent files into some categories like
Documents, Images, Video, Presentations, etc, and I've discovered an
unfortunate decision in our template matching algorithm, making this quite hard
to get 100% right.
The deal is that the designers think that the Documents section should not
contain Presentations (which makes quite good sense if there is a separate
section for this). Also we'd like to have an "Other" section with unclassified
stuff. But since nfo:Presentation is a subclass of nfo:Document a query for all
documents would also include all presentations (which is "correct", but not
what we want in this particular case).
So roughly speaking the query for the Documents section should be
all subtypes of nfo:Document but NOT nfo:Presentation
Currently this is simply not possible in Zeitgeist, because we do logical OR
between all subject templates. What I'd propose to do to make these kind of
queries possible, is to switch to logical AND between subjects, but keep it at
logical OR between events. So in code I'd like the following code to work:
su1 = Subject.new_for_values(interpretation=DOCUMENT)
su2 = Subject.new_for_values(interpretation="!"+PRESENTATION)
ev = Event()
ev.subjects.append(su1)
ev.subjects.append(su2)
# now query for [ev].
As you probably realize we have the same problem (but even stronger) in the
"Other" section where we want to exclude all the listed sections and match
everything else.
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