Last modified: 2008-02-05 11:10:53 UTC

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Bug 12759 - Relations pointing to non-semantic pages get broken
Relations pointing to non-semantic pages get broken
Product: MediaWiki extensions
Classification: Unclassified
Semantic MediaWiki (Other open bugs)
All All
: Normal normal with 2 votes (vote)
: ---
Assigned To: Nobody - You can work on this!
Depends on:
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Reported: 2008-01-23 16:55 UTC by Yaron Koren
Modified: 2008-02-05 11:10 UTC (History)
1 user (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Description Yaron Koren 2008-01-23 16:55:36 UTC
Properties of type "Page", i.e. relations, that point to a page that does not have semantics enabled for it get their object_id set to NULL in the smw_relations table in the database, i.e. they become inoperable, when that page is re-saved. This is a problem for Semantic Forms, because form pages don't have semantics enabled, so relations pointing to form pages become broken. The problem happens in the storeData() function in /includes/SMW_Factbox.php, which looks like this:

        static function storeData($processSemantics) {
                // clear data even if semantics are not processed for this namespace
                // (this setting might have been changed, so that data still exists)
                $title = SMWFactbox::$semdata->getSubject();
                if ($processSemantics) {
                        smwfGetStore()->updateData(SMWFactbox::$semdata, SMWFactbox::$m_new);
                } elseif (!SMWFactbox::$m_new) {

When the page is re-saved, storeData() is called on it; $processSemantics is false, and so is the $m_new variable, so deleteSubject() is called on this page; that, in turn, sets the object_id to NULL for all relations pointing to this page.

One easy fix to this problem is to get rid of the "elseif" clause altogether; I don't know if that's the ideal solution, because I don't know what the aim of that deleteSubject() call is - the deleteSubject() function, despite its name, also invalidates relations that have that page as the object.
Comment 1 Markus Krötzsch 2008-02-05 11:10:53 UTC
Should be fixed now. There was also a problem with creating new articles after they were already used as objects. This case also should yield proper IDs in the table now.

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