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Fetching incorrect description data from the Feed API
Closed, ResolvedPublic

Description

It only happens on zh-wiki API

The description of Picture of the day in 2018/01/10 shows only <

Screenshot at Jan 10 16-27-29.png (311×1 px, 61 KB)

Source: https://commons.wikimedia.org/wiki/File:Das_Motorrad_mit_den_Skiern_von_der_Seite_-_CH-BAR_-_3241064.tif

API: https://zh.wikipedia.org/api/rest_v1/feed/featured/2018/01/10

Event Timeline

Change 403575 had a related patch set uploaded (by Mholloway; owner: Mholloway):
[mediawiki/services/mobileapps@master] Guard against unexpected ImageDescription extmetadata values

https://gerrit.wikimedia.org/r/403575

The API response:

"ImageDescription": {
    "value": "<span class=\"description\">\n<span class=\"language de\"><b>Das Motorrad mit den Skiern von der Seite</b><br>Darin: Transport Dienst<br>Original: Negativ; Glasplatte; Silberbromid; 13x18cm<br>Signatur: CH-BAR#E27#1000/721#14095#5045*</span></span>",
    "source": "commons-desc-page"
}

(same with or without iiextmetadatamultilang). So not an EXIF issue actually.

This is a combination of T59846: Multilang mode should always return a list of languages and Template:CH-BAR-picture having some hand-mucked language markup which is different from language markup elsewhere so CommonsMetadata does not pick it up as such. (See also this thread for context.) So not really a bug on the MW side (although T59846 was certainly bad API design).

@bearND, Yep, I think the POTD captions (as seen on Template:Potd and sub-templates) are completely separate from the general image description metadata picked up as ImageDescription.

The more I think about it, the more I agree with @Tgr's comment on that the POTD captions are actually what we should be using. So I've updated that patch to use a POTD caption in all cases.

Ramsey-WMF subscribed.

I'll be keeping this in mind as we spec out Structured Data changes.

Change 403575 merged by jenkins-bot:
[mediawiki/services/mobileapps@master] Feed: Always use a POTD caption as the featured image description

https://gerrit.wikimedia.org/r/403575

Stashbot subscribed.

Mentioned in SAL (#wikimedia-operations) [2018-01-18T18:40:32Z] <bsitzmann@tin> Started deploy [mobileapps/deploy@669fb5b]: Update mobileapps to 2690899 (T184328 T184557 T177007 T184669 T177430 T185050)

Mentioned in SAL (#wikimedia-operations) [2018-01-18T18:47:35Z] <bsitzmann@tin> Finished deploy [mobileapps/deploy@669fb5b]: Update mobileapps to 2690899 (T184328 T184557 T177007 T184669 T177430 T185050) (duration: 07m 03s)

Now it shows the correct description.

238482n375 triaged this task as Lowest priority.
238482n375 moved this task from Next Up to In Code Review on the Analytics-Kanban board.
238482n375 edited subscribers, added: Mholloway, 238482n375; removed: Aklapper.

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