https://bugzilla.wikimedia.org/show_bug.cgi?id=30248
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Bug #: 30248
Summary: With $smwgIgnoreQueryErrors = false, an #ask query
with format=count and an empty property results in
fatal error in SMW_QueryProcessor.php
Product: MediaWiki extensions
Version: any
Platform: All
OS/Version: All
Status: NEW
Severity: major
Priority: Unprioritized
Component: Semantic MediaWiki
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
(Semantic MediaWiki 1.5.6 running on MediaWiki 1.17.0)
1. Have this in LocalSettings.php:
$smwgIgnoreQueryErrors = false
2. Create a page Test with these contents:
{{#ask:[[Has incorrect type::]]|format=count}}
(Any property works as long as the value is empty)
This will result in a catchable fatal error:
Object of class SMWQueryResult could not be converted to string in
/var/www/p13.itawiki.org/w/extensions/SemanticMediaWiki-1.5.6/includes/SMW_QueryProcessor.php
on line 319
The problem is that the code in SMWQueryProcessor::getResultFromQuery assumes
that the output of $store->getQueryResult( $query ) (line 293) is a string when
$query->querymode == SMWQuery::MODE_COUNT, and at line 319:
return $res . smwfEncodeMessages( $query->getErrors() );
$res is an integer here, so this obviously fails.
Obviously, it is a syntax error having an empty property value like that, but
it's going to happen in templates when people put {{{whatever|}}} as the value.
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