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Maniphest T23230

Category count is incorrect
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Description

Author: mufka.wiki

Description:
I remember seeing that category counts can be slightly off because a member page might have been blanked and restored causing the page to temporarily drop out of the category. It seems that the count can be off for other unexplained reasons. As an example https://en.wikipedia.org/wiki/Category:Days_of_the_year usually shows about 344 member pages. The correct number is 366. There are not enough regular page blankings to account for the difference in the true count vs. the displayed count.

Version: unspecified
Severity: normal

Details

Reference
bz21230

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Event Timeline

• bzimport raised the priority of this task from to Low.Nov 21 2014, 10:51 PM
• bzimport added a project: WMF-General-or-Unknown.
• bzimport set Reference to bz21230.
• bzimport added a subscriber: Unknown Object (MLST).
• bzimport created this task.Oct 22 2009, 10:58 AM
• bzimport added a comment.Jun 11 2010, 11:22 AM

mufka.wiki wrote:

It appears that this problem may have been recently fixed.

DieBuche added a comment.Dec 14 2010, 8:49 AM

Shows 365. Unless a day is missing, this is still open.

• bzimport added a comment.Dec 14 2010, 11:18 AM

mufka.wiki wrote:

There are 366 (none missing) but the display is still 365. Something is still wrong. It knows the correct count. If you look at the two pages you see:
The following 200 pages are in this category, out of 365 total.
and
The following 166 pages are in this category, out of 365 total.
200 + 166 = 366.

• bzimport added a comment.Apr 30 2012, 4:24 PM

Thehelpfulonewiki wrote:

This is very strange behaviour - it now shows 363 days, I don't think we've lost any days, but all the pages appear to be listed - maybe something's wrong with the category count?

Danmichaelo added a comment.May 4 2012, 5:54 PM

I just came across the same bug here [[:no:Kategori:Trenger oppdatering]]

As of this writing, the category contains 252 articles, but the category page (and PAGESINCAT) says 251.

The two category pages says (translated to English):

  1. The following 200 pages are in this category, out of 251 total
  2. The following 52 pages are in this category, out of 251 total

Clearly 200 + 52 = 252, not 251. Counting category members using the API also results in 252.

I've even tried purging all the pages in the category, but the counter didn't change.

• MZMcBride mentioned this in T85527: Category gives wrong number of pages.Dec 31 2014, 7:02 AM
valhallasw mentioned this in T85696: Allow action=purge to recalculate the number of pages/subcats/files in a category.Jan 2 2015, 12:49 PM
jayvdb updated the task description. (Show Details)Feb 15 2015, 3:31 AM
jayvdb set Security to None.
TTO merged tasks: T85527: Category gives wrong number of pages, T117971: Category size count is radically different than actual count..Jan 24 2017, 12:19 PM
TTO added subscribers: Romaine, Betacommand, WTM and 9 others.
TTO subscribed.

Sorry! I really should have merged those tasks to T18036: Number of category members (PAGESINCATEGORY) is inaccurate for large categories, the oldest task tracking this issue.

TTO closed this task as a duplicate of T18036: Number of category members (PAGESINCATEGORY) is inaccurate for large categories.Jan 24 2017, 12:22 PM
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