[ReadingLists] mobile apps Saved items will be displayed twice in Reading lists
Closed, ResolvedPublic3 Estimated Story Points
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	Etonkovidova
	Feb 26 2026, 4:44 PM

Description

Tested on testwiki wmf.17 and mobile app (on iPhone). Seems to be iPhone specific

Steps:

As a logged-in user on mobile app, create a list, e.g. as in the screenshots below, the reading list "Cosmology" was created.
On mobile app add one article to the "Cosmology" list - e.g. "Max Tegmark" article is added to the "Cosmology" list

On the app "Max Tegmark" article is added to the Saved list "Cosmology" and will be displayed in "Cosmology" and in All articles:

Go to the test wiki Reading list as a user who just added "Max Tegmark" article to the "Cosmology" reading list on app.

What happened:

"Max Tegmark" article will be displayed twice:

Screenshot 2026-02-26 at 3.30.46 PM.png (1×2 px, 1 MB)

All articles and Cosmology reading lists on mobile app were synced resulting in displaying the same article twice.

Details

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	Deduplicate reading list entries in ReadingListRepository::getAllListEntries	mediawiki/extensions/ReadingLists	master	+506 -143

Customize query in gerrit

Related Objects

Mentioned In: T400361: Create page that displays feed of all reading list items

Event Timeline

Etonkovidova created this task.Feb 26 2026, 4:44 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFeb 26 2026, 4:44 PM

Etonkovidova updated the task description. (Show Details)Feb 26 2026, 8:32 PM

Etonkovidova mentioned this in T400361: Create page that displays feed of all reading list items.Feb 26 2026, 8:53 PM

Jdrewniak moved this task from Backlog to Special:ReadingLists page on the FY25-26 Reading Lists (Phase 2 - Beta feature) board.Mar 2 2026, 7:25 PM

@HFan-WMF @Sneha If a mobile apps user has a page (e.g. Max Tegmark) in a custom list and the "default" list , or in 2 different custom lists, do we want to deduplicate these and show "Max Tegmark" only once on the "all articles" view on Special:ReadingLists?

aude added a project: Reader Experience Team.Mar 9 2026, 4:36 PM

aude triaged this task as High priority.Mar 9 2026, 4:38 PM

The ios app appears to add custom reading list entries to both the custom list and default reading list, hence we see it twice on the special page. The android app does not appear to do this.

https://github.com/wikimedia/wikipedia-ios/blob/main/Wikipedia/Code/ReadingListsController.swift#L370-L373

Also, a user can add a particular page to multiple custom lists and don't think we should restrict users from doing this.

@aude Yes, an article should only show once in all items even if its added to multiple lists including default.

When we work on custom list we will have to figure out the best approach that is consistent between web, android app, and iOS app but will require cross team discussion

Aklapper renamed this task from [ReadingLists] mobile apps Saved items wil be displayed twice in Reading lists to [ReadingLists] mobile apps Saved items will be displayed twice in Reading lists.Mar 9 2026, 8:28 PM

aude set the point value for this task to 3.Mar 10 2026, 1:46 PM

aude moved this task from Incoming to Needs refinement on the Reader Experience Team board.Mar 10 2026, 1:49 PM

aude moved this task from Needs refinement to Ready for sprint on the Reader Experience Team board.

For this, I think we can handle deduplication via the database query in ReadingListRepository::getAllListEntries(), which could have a $duplicate option.

bwang moved this task from Ready for sprint to REx Sprint 16 [Q3 Mar 10 - Mar 23] on the Reader Experience Team board.Mar 10 2026, 5:41 PM

bwang edited projects, added Reader Experience Team (REx Sprint 16 [Q3 Mar 10 - Mar 23]); removed Reader Experience Team.

aude claimed this task.Mar 11 2026, 2:00 PM

aude moved this task from Ready to In progress on the Reader Experience Team (REx Sprint 16 [Q3 Mar 10 - Mar 23]) board.

Change #1251170 had a related patch set uploaded (by Aude; author: Aude):

[mediawiki/extensions/ReadingLists@master] Deduplicate reading list entries in ReadingListRepository::getAllListEntries

https://gerrit.wikimedia.org/r/1251170

gerritbot added a project: Patch-For-Review.Mar 12 2026, 8:44 PM

aude removed aude as the assignee of this task.Mar 12 2026, 9:04 PM

aude moved this task from In progress to Needs code review on the Reader Experience Team (REx Sprint 16 [Q3 Mar 10 - Mar 23]) board.

Change #1251170 merged by jenkins-bot:

[mediawiki/extensions/ReadingLists@master] Deduplicate reading list entries in ReadingListRepository::getAllListEntries

https://gerrit.wikimedia.org/r/1251170

Jdlrobson-WMF moved this task from Needs code review to Needs QA on the Reader Experience Team (REx Sprint 16 [Q3 Mar 10 - Mar 23]) board.Mon, Mar 16, 11:54 PM

ReleaseTaggerBot added a project: MW-1.46-notes (1.46.0-wmf.20; 2026-03-17).Tue, Mar 17, 12:01 AM

Maintenance_bot removed a project: Patch-For-Review.Tue, Mar 17, 12:31 AM

Checked testwiki wmf. 22 - the issue is fixed.
Test scenarios that were checked (besides the steps in the task description) on both Android and iOS:
(1) an article is added to the app default Saved list and later to existing multiple lists

(2) an article is added to a newly created list and then to multiple existing lists

(3) an article in Saved lists was moved to different existing lists (Android specific; iOS app allows to add to another reading list, not move)

fyi @HFan-WMF

	F72439984: Screenshot 2026-02-26 at 3.30.46 PM.png
	Feb 26 2026, 8:32 PM

	F72438571: Screenshot 2026-02-26 at 11.36.56 AM.png
	Feb 26 2026, 4:44 PM

[ReadingLists] mobile apps Saved items will be displayed twice in Reading listsClosed, ResolvedPublic3 Estimated Story PointsActions

Description

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[ReadingLists] mobile apps Saved items will be displayed twice in Reading lists
Closed, ResolvedPublic3 Estimated Story Points
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