Steps to reproduce:
As the category 快速刪除候選 has two subcategories and no other pages, the result is supposed to be 0. I tried to purge the category but it did not work.
(PAGESINCATEGORY is not part of the ParserFunctions extension, hence removing that project tag)
It is stored in the database:
https://zh.wikibooks.org/w/api.php?action=query&prop=categoryinfo&pageids=13169
{
"batchcomplete": "",
"query": {
"pages": {
"13169": {
"pageid": 13169,
"ns": 14,
"title": "Category:\u5feb\u901f\u522a\u9664\u5019\u9078",
"categoryinfo": {
"size": 1,
"pages": -1,
"files": 0,
"subcats": 2
}
}
}
}
}It seems the text "This category has the following 2 subcategories, out of 2 total. " on the category itself is ignoring negative values.
According to @A2093064 's advise I removed both of its subcategories and deleted that category to fix above glitch in database. After restoring again it seems working well so I'm closing it as invalid (if I'm making mistakes fell free to correct me).
If it is valid then it is a dupe of T85696: Allow action=purge to recalculate the number of pages/subcats/files in a category.