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[Semediawiki-user] Iterating queries - go 'phut' at 3rd iteration

From: Izzy <Isabel.Sargent@or...> - 2008-12-09 13:49

I am trying my hand at iterative querying to try to produce hierachies of
pages.

I have a page type that has a property 'Has parent' and want to produce a
list of all pages, sorted into the hierachy.

My top level query has the form:

{{#ask: [[Category:Research Projects]][[Has parent::None]]
        |limit=500
        |link=none
        |sort=Ultimate parent
        |format=template
        |template=Gen2Query
}}

and Template:Gen2Query has the form:

{{#vardefine:Gen1|{{{1|}}}}}
=={{#var:Gen1}}==
{{#ask: [[Category:Research Projects]][[Has parent::{{#var:Gen1}}]]
        |limit=500
        |link=none
        |format=template
        |template=Gen3Query
}}

At this point, all works well. The results from the first query are passed
to the first template which produces a heading for each first query result
and then performs a search using the first query result. 

Another level can be added if Template:Gen3Query has the form:

{{#vardefine:Gen2|{{{1|}}}}}
==={{#var:Gen2}}===
{{#ask: [[Category:Research Projects]][[Has parent::{{#var:Gen2}}]]
        |limit=5000
        |link=none
}}

but if Template:Gen3Query tries to call a third template by including the
options:

        |format=template
        |template=Gen4Query

the third generation disappears from my resulting output. I cannot see why
this should happen.

Am I misusing SMW or is there a problem?

Izzy
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Re: [Semediawiki-user] Iterating queries - go 'phut' at 3rd iteration

From: Izzy <Isabel.Sargent@or...> - 2008-12-09 14:53

Similarly, I have another query that is truly iterative. (this uses a 'Has
child' property that is derived elsewhere using a query on the Has parent
property). This requires only 3 pages and is run from within the pages being
queried to determine the name of the page that is the ultimate (top level)
parent of the current page.

The first page initiates the iterator:

==Top level project==
{{#vardefine:currentpage|{{PAGENAME}}}}
{{UltimateParentQuery}}
[[Ultimate parent::{{#var:ultimateparent}}]]


This initiates the variable being searched on (<currentpage>) and calls the
query page (Template:UltimateParentQuery):

{{#ask: [[Category:Research Projects]][[Has
child::{{#var:currentpage}}]][[Has child::+]]
        |format=template
        |link=none
        |default={{#vardefine:ultimateparent|{{#var:currentpage}}}}
        |template=UltimateParent
        |limit=1
}}

This searches for the page that has the property Has child:<currentpage>. If
there is no result, <currentpage> is written out. If there is a result, this
is sent to to Template:UltimateParent:

{{#vardefine:currentpage|{{{1|}}}}}
{{UltimateParentQuery}}

which sets <currentpage> to the result and re-runs the query.

This should continue until the top level parent is found. However, it fails
after 3 iterations. This means that for 4th generation pages and beyond, the
grandparent's page name is written out.

Again, can anyone see why this fails at the 3rd iteration?
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Re: [Semediawiki-user] Iterating queries - go 'phut' at 3rd iteration

From: Izzy <Isabel.Sargent@or...> - 2009-01-14 15:42

Has there been any more progress on this, or is it considered a quirk of SMW
that we shouldn't be messing with?

I have tried several different ways around the problem but can find no
workable ways to return the hierarchy of set of pages. This would be so
useful as our Wiki grows.
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