https://bugzilla.wikimedia.org/show_bug.cgi?id=37777
Web browser: ---
Bug #: 37777
Summary: Database abstraction layer prevents reading of complex
structures.
Product: MediaWiki extensions
Version: master
Platform: All
OS/Version: All
Status: NEW
Severity: blocker
Priority: Unprioritized
Component: Semantic MediaWiki
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Mobile Platform: ---
I have tried to extend SemanticMediaWiki with additional geographical shapes as
semantic properties. (this has been done in the branch 'polygons')
A polygon property consists of many coordinate properties. This is a more
advanced structure than previously defined. Storing the data seems to work
fine, however reading the data doesn't go as well.
I seem to have isolated the issue to the method getProperyValues in
the class SqlStubSemanticData. Here it seems that there is some kind
of mixup going on when i have defined a container to hold coordinates.
According to the code it seems that it tries to fetch a given array
entry with the key of the property in mStubPropVals. So if i have
defined the property "Polygon" that is of type _gpo (Graphical
Polygon), this type holds a list of _geo properties which is also
defined as a semantic property "Coordinates"
However, when this instance of Property is loaded in
SqlStubSemanticData, i can see that the mStubPropVals is populated
with a key of "Coordinates" when it is looking for a key "Polygon".
This issue prevents me to go forward with my geographical shapes properties.
Would be great if someone with a greater understanding of the database
abstraction layer could take a look at this.
Steps to reproduce issue:
1. Checkout polygons branch
2. Create a property of type [[Has type::Geographic polygon]]
3. Create a page with polygon property (ex. [[Polygon::34,24:33,22:64,22]])
4. Create an ask query. something along the lines of:
{{#ask: [[Category:Polygon]]
| ?Polygon
| format=table
}}
5. Put a breakpoint in SqlStubSemanticData in the method getProperyValues and
look at how the polygon data is attempted to be loaded.
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