Extension talk:Semantic Drilldown

Database PostgreSQL: Error 42601 Syntax-Error
I run a SMW (2.4.1) MW (1.27.1) with PHP (7.0.7) and PostgresSQL (9.4.9)

As long as I set only one filter in my drilldowninfo-tag everything on Special:BrowseData is fine. But as soon as a second (or third) filter the 42601 ERROR occur: My guess. PostgreSQL hast no CONVERT-Funktion. I also posted this for a while at Phabricator

Backtrace:

Any suggestion or solutions? Thanks a lot!


 * What's the full SQL call, do you know? Yaron Koren (talk) 14:18, 19 January 2017 (UTC)


 * --M art in (talk) 14:27, 19 January 2017 (UTC)
 * On Referata there is a similar bug - but more than one filters are possible there --M art in (talk) 14:53, 19 January 2017 (UTC)


 * Thanks for pointing out that bug on Referata, though it's a different bug. Yes, the issue does seem to be CONVERT with PostgreSQL - that function exists, but it has different syntax and (I think) behavior. I just checked in what I think are fixes for both bugs - if you get the latest code, hopefully it should work now. Yaron Koren (talk) 04:35, 20 January 2017 (UTC)


 * Thanks for the fast fix. The Problem with CONVERT was solved but now there is stll a database error 42883

Seems there are still some problems with PostgreSQL. The full SQL-query is this:

Could you please have a look again? --M art in (talk) 08:23, 23 January 2017 (UTC)


 * Ah, I didn't realize that IF was a problem too... I just checked in another fix, so hopefully now it works. Yaron Koren (talk) 18:04, 24 January 2017 (UTC)
 * Thank you very much for the fix! Works great now with postgresSQL. I really appreciate your patience with stupied users like me and your time you have to spend therefore. --M art in (talk) 08:44, 30 January 2017 (UTC)
 * Great. Sorry about the problems! Yaron Koren (talk) 22:12, 30 January 2017 (UTC)

Free text search
Hi. Is there a way to add a free-text search box pointed only to the filtered pages? I am developing a smw about Supreme Court orders fron my country, by now I have about 80k documents. Filters are great to narrow down the search, but a search box would be very helpfull. Greetings.
 * No, unfortunately. If you want this feature, you may have to install the Cargo extension (which I also wrote) - it is an alternative to Semantic MediaWiki that contains a drilldown feature, closely modeled after Semantic Drilldown, but which also supports free-text search. Yaron Koren (talk) 15:28, 25 January 2017 (UTC)
 * Thanks a lot. When you say alternative to smw, does it mean that both extensions cannot work together?
 * They can run on the same wiki, although each one stores data in its own location, and they can't query each other's data. Yaron Koren (talk) 17:03, 25 January 2017 (UTC)

Filtering Data type property
I have a property wich is Date type. It works fine but, when I set $sdgMinValuesForComboBox=1; the filter doesnt give any result. I would thank any idea..


 * That's strange. What if you set it to 2? Yaron Koren (talk)


 * No matter the value, the moment ComboBox is activated for date filter, it doesnt work anymore.
 * Without ComboBox, when I click on a date, the follow line is generated: ...&Fecha_de_publicacion=febrero_2010 (and works)
 * With ComboBox: ...&_search_Fecha_de_publicacion%5B0%5D=febrero+2010 (and it doesnt work)


 * Well, that's a bug in the extension. I guess I never tried setting that variable to a value low enought that it would kick in for dates, so I never saw the issue. Out of curiosity, why do you want a combo box to appear, and not individual links, even if there are only a few values? Yaron Koren (talk) 19:43, 25 January 2017 (UTC)


 * Date ComboBox creates a group for each month, I have documents from 84 different months. So I would need to set up a very high value for $sdgMinValuesForComboBox. Also there is another property (key word) that has more that a hundred values. So, a ComboBox is more functional for me.


 * There may be 84 months, but only up to 12 months are shown at a time in the drilldown interface. Yaron Koren (talk) 20:37, 25 January 2017 (UTC)


 * You are right. I just set up $sdgMinValuesForComboBox=13. I'll let you know how it worked. Thanks.
 * It took a while but the date filter is already showing only 12 groups. Thanks.

Performance
Hi. I have a Category with 42k pages already loaded and it will grow fast. By now, it takes one minute to load the drilldown page. I wolud appreciate any suggestion to keep a good performance. Thanks.


 * I'm surprised that it's taking that long to load - it may be one specific filter that is causing the problem. You could try removing the filters one at a time, to try to isolate the problem. In any case, another option is to install and use the Cargo extension, which provides its own very similar drilldown interface - either instead of or in addition to SMW+SD. Cargo has a more straightforward database structure, so I'm guessing that it's drilldown would be faster for your data. Yaron Koren (talk) 14:57, 7 February 2017 (UTC)

New release?
I have seen that several fixes especially concerning the querying for dates were authored since the last 2.0.2 release. Thus it will be cool to have a new version. --&#91;&#91;kgh&#93;&#93; (talk) 16:42, 1 May 2017 (UTC)
 * It would be immensely useful to have a Composer version so that it can be integrated with the rest of the Semantic MediaWiki suite of tools. This is the last major extension from Extension:Semantic Bundle that still has to be installed manually without Composer.

"Special:Filters" and "Special:Create filters" missing after upgrade
Hi, I've upgraded my MW installation:

MediaWiki          1.19.23 PHP                5.3.3 (apache2handler) MySQL              5.1.73 Semantic MediaWiki 1.7.0.2 Semantic Drilldown 1.1
 * FROM

MediaWiki          1.23.15 PHP                5.3.3 (apache2handler) MySQL              5.1.73 Semantic MediaWiki 2.4.1 Semantic Drilldown 2.0.2
 * TO

The wiki behaves ok, all existing filters are working as expected. However, both filter-related special pages seem to be gone. I've already run the SMW "Data repair and upgrade" multiple times but to no avail. Can this be a configuration setting issue in LocalSettings.php or some missing dependency? Any pointers welcome.

TIA --Nakohdo (talk) 15:07, 16 June 2017 (UTC)


 * Yes, this is not a bug - in version 2.0, those two special pages were removed, because filters are now defined in category pages, as opposed to in their own separate pages. (The "Filter:" pages are still supported, but they will stop being supported at some point, so I'd suggest converting everything over to use #drilldown_info.) Yaron Koren (talk) 15:31, 16 June 2017 (UTC)


 * Many thanks for this information, Yaron. This helps a lot. Nakohdo (talk) 13:04, 19 June 2017 (UTC)

#drilldownlink: Syntax for "filters" setting
Hi,

I don't quite understand the correct syntax for the "filters" parameter of #drilldownlink. The documentation says:


 * #drilldownlink

filters - the set of filters to apply, in the format "a=b&c=d&..."

Whereas the syntax for #drilldowninfo looks different:


 * #drilldowninfo

Could you perhaps provide a working example for #drilldownlink with filters set? Many thanks in advance.

--Nakohdo (talk) 09:34, 30 June 2017 (UTC)


 * Here's one example. Yaron Koren (talk) 14:03, 30 June 2017 (UTC)


 * Many thanks for the quick reply. However, that's an example for #drilldowninfo where the documentation is quite clear. I'm struggling with #drilldownlink. Nakohdo (talk) 14:19, 30 June 2017 (UTC)


 * Oh, oops. I can't think of any public examples of #drilldownlink, but for that earlier  example you could have a parameter like "filters=Language=English&Data type=Education". Yaron Koren (talk) 18:46, 30 June 2017 (UTC)

Is the drilldown info cached somewhere?
I am running into an issue I can't remember experiencing with Drilldown. No matter what I change in the #drilldowninfo tag in my category, the Special:BrowseData page still shows an earlier version of the drilldown filters. It is behaving as if the drilldown filter info was cached somewhere. --Lalquier (talk) 12:30, 12 March 2018 (UTC)


 * I don't think so... I can't think of why that would be happening for you. Yaron Koren (talk) 13:20, 12 March 2018 (UTC)


 * That's very odd. I was hoping a full rebuildData would clear things up but it didn't. For some reason, the filters displayed on the Special:BrowseData page are not the same filters that are defined in the category page.I will let you know if I figure this one out. --Lalquier (talk) 10:15, 14 March 2018 (UTC)


 * Update - I even tried to delete the call to #drilldowninfo in my category page and I can still see the Special:BrowseData page for that category, so it is really cached somewhere. I tried restarting the web server, forcing an exclusion to the mediawiki cache for that page, clearing my browser cache with no result. Very odd. --Lalquier (talk) 11:23, 15 March 2018 (UTC)


 * Update 2 - so it took a few days but the cache was eventually cleared on its own and the changes were applied. I still don't know which cache is causing such a delay between mediawiki, apache and the browser but at least I know it sorts itself out eventually. --Lalquier (talk) 01:22, 16 March 2018 (UTC)

Properties set by a parser hook cannot be filtered
Property filtering works When setting or Has type::Text, but it doesn't when we set the property types through an customized parser hook. IE:. Any idea why?


 * No idea. When you use the parser hook/function, does the data get set correctly? Does it show up in query results, for instance? Yaron Koren (talk) 00:42, 26 March 2018 (UTC)


 * A quick update after some further digging. Data gets set correctly, and the culprit is not the parser function but a query. If on a property page we put an ask-query like, filtering on that property ceases to works. Remove the query from the property page, and it still doesn't work until on the Special:SMWAdmin page we run the 'Schedule disposal' task. The filtering works again, until we put back the ask-query on the property page. I had wanted to show this on the SMW sandbox, but SemanticDrilldown is not installed there. --Remco de Boer 12:53, 27 March 2018 (UTC)