Re: [Semediawiki-user] setting properties from queries [vaguely SIO]

[Bob M. <unc...@gm...>]

Hi Patrick,

I suspected something like you suggested would be a problem, but I
just did a test and the following always gives the right result on the
first save (SMW 1.5g-SVN, SIO 0.4).

Even if the #ask: is before the set_internals, which seems counter-intuitive!

Add flour
{{#set_internal:is part of recipe
|has ingredient=flour
|has amount=200g
}}

Add eggs
{{#set_internal:is part of recipe
|has ingredient=eggs
|has amount=2
}}

I have this number of ingredients [[has number of ingredients::{{#ask:
[[is part of recipe::{{PAGENAME}}]]|format=count}}]]

(I got the same result with a template.)

Still looking for a drawback!

cheers,
Bob.



On Fri, Mar 5, 2010 at 2:47 AM, Patrick Nagel <ma...@pa...> wrote:
> Hi Bob,
>
> On 2010-03-04 20:55 UTC Bob MacCallum wrote:
>> I tried something like this today
>>
>> [[number of ingredients::{{#ask: [[Is part of recipe::{{PAGENAME}}]] |
>> format=count }} ]]
>>
>> and to my amazement it works.
>>
>> With some judicious arraymapping, mainlabel=- and link=none you could
>> even assign a summary list of SIO properties to the page (for example
>> a unique list of ingredients) or calculate the total calories (if each
>> SIO had a calories property).
>>
>> However, something makes me feel uneasy about this.  Is there a
>> chicken and egg issue?  Will the summary properties require a refresh
>> of the page to be accurate?  Are there CPU load issues?
>>
>> I'd appreciate a simple "steer clear" or "it's fine" from someone with
>> a better understanding of the internals.  No need to go into details.
>
> There is a problem: you will always have to save a page twice. When you save
> it for the first time, Property:number of ingredients will be empty. This is
> because at that time, the #ask query will return nothing, since Property:Is
> part of recipe is not actually in the database, yet.
>
> Patrick.
>
> --
> Key ID: 0x86E346D4            http://patrick-nagel.net/key.asc
> Fingerprint: 7745 E1BE FA8B FBAD 76AB 2BFC C981 E686 86E3 46D4
>
> ------------------------------------------------------------------------------
> Download Intel&#174; Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
> _______________________________________________
> Semediawiki-user mailing list
> Sem...@li...
> https://lists.sourceforge.net/lists/listinfo/semediawiki-user
>
>



-- 
http://darwintunes.org - a test-tube for cultural evolution
http://evolectronica.com - survival of the funkiest
http://compare-stuff.com - confused? you will be!
http://twitter.com/darwintunes
http://twitter.com/bobmaccallum