Lucas_Werkmeister_WMDE added a comment.
Well, I would say it’s not really a bug, more an unfortunate combination of
features. There are currently two ways to get an entity ID out of MWAPI:
Given a “client-like” API result like this
<page _idx="32882493" pageid="32882493" ns="0" title="Mary E. Cobb"
contentmodel="wikitext" pagelanguage="en" pagelanguagehtmlcode="en"
pagelanguagedir="ltr" touched="2021-06-28T08:26:03Z" lastrevid="1030833675"
length="7412">
<pageprops defaultsort="Cobb, Mary E." page_image_free="Mary_E._Cobb.jpg"
wikibase_item="Q6779361" />
</page>
then the MWAPI config
?item wikibase:apiOutputItem mwapi:item.
corresponds to the XPath `pageprops/@wikibase_item`, i.e. the `wikibase_item`
attribute of the `pageprops` child element of that `page` element.
Given a “repo-like” API result like this
<page _idx="102358522" pageid="102358522" ns="0" title="Q107110037"
contentmodel="wikibase-item" pagelanguage="en" pagelanguagehtmlcode="en"
pagelanguagedir="ltr" touched="2021-06-08T03:16:28Z" lastrevid="1437430459"
length="1963">
<pageprops wb-claims="3" wb-identifiers="0" wb-sitelinks="1" />
</page>
then the MWAPI config
?item wikibase:apiOutputItem mwapi:title.
corresponds to the XPath `@title`, i.e. the `title` attribute of that `page`
element.
In both cases, the assumption is that the XPath selects the entity ID as a
string, but for the `title` attribute, that’s only true for items, not other
entity types. (On Wikibase installations where items aren’t in the main
namespace, I assume it’s not even true for items.) But I’m not sure what the
best way to solve this would be – I would be hesitant to hard-code something
like “remove everything up to the first colon” into MWAPI.
Maybe we can add a new value for the `query+prop` API parameter, which would
add the page’s entity ID (as an attribute on the `page` element, like the
`contentmodel`, `pagelanguage`, etc.)? And then we could add that by default to
the MWAPI “Generator” service, and add a new shortcut, `mwapi:entityid` =
`@wikibase_entity` or something like that.
TASK DETAIL
https://phabricator.wikimedia.org/T285606
EMAIL PREFERENCES
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To: Lucas_Werkmeister_WMDE
Cc: Lydia_Pintscher, Lucas_Werkmeister_WMDE, Aklapper, Ainali, Invadibot,
MPhamWMF, maantietaja, CBogen, Akuckartz, Nandana, Namenlos314, Lahi, Gq86,
GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, _jensen, rosalieper,
Scott_WUaS, Jonas, Xmlizer, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984,
Manybubbles, Mbch331
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