Category talk:Pages with template loops
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Recent changes
- The tracking category Category:Pages with template loops is now added when a template loop is found. A template loop is for example when a template tries to use a second template that uses the first template. [1]
Category:Pages with template loops
Per the above tech news, Category:Pages with template loops now exists to track pages with template loops in them. Some documentation on that Category page about how to fix template loops, assuming that they are a problem, would be welcome. – Jonesey95 (talk) 21:32, 3 April 2017 (UTC)
- What's the difference between that category, and Category:Template loop warnings? Problems in the latter category are usually easy to understand. wbm1058 (talk) 21:38, 3 April 2017 (UTC)
- The new Category:Pages with template loops automatically tracks all pages where a template loop was encountered during rendering. It may populate slowly as pages are rendered. It can take months before a page is rendered if it isn't edited. The English Wikipedia has added Category:Template loop warnings in MediaWiki:Parser-template-loop-warning since 2009 (the default message has no category). However, the category is only added if MediaWiki:Parser-template-loop-warning is displayed in the rendered page and that only happens if a page tries to display the result of a template loop. For example, on page X the code
{{X}}will produce the message and therefore the category. But the code{{#if:{{X}}|A|B}}will not try to display{{X}}which will just evaluate to a non-empty error message during processing, so the#ifwill displayA. Category:Template loop warnings is not added in this case but Category:Pages with template loops is. The former should be a subset of the latter, at least when Category:Pages with template loops has been fully populated. We could also "merge" the two categories by removing our old category from MediaWiki:Parser-template-loop-warning (we could still keep the name by creating MediaWiki:Template-loop-category with it). PrimeHunter (talk) 00:23, 4 April 2017 (UTC)
- The new Category:Pages with template loops automatically tracks all pages where a template loop was encountered during rendering. It may populate slowly as pages are rendered. It can take months before a page is rendered if it isn't edited. The English Wikipedia has added Category:Template loop warnings in MediaWiki:Parser-template-loop-warning since 2009 (the default message has no category). However, the category is only added if MediaWiki:Parser-template-loop-warning is displayed in the rendered page and that only happens if a page tries to display the result of a template loop. For example, on page X the code
- I picked a page in Category:Pages with template loops, Postbellum, to track down the problem.
- Next I isolated the code that was generating the error:
{{Language with name/for||Latin|"after the war"}}(trial & error to do that, as there's no obvious error message) - Digging deeper into that, I found:
{{#ifexist: {{ISO 639 name|}} }}(with a blank parameter) silently populates Category:Pages with template loops{{ISO 639 name|}}populates Category:Template loop warnings and writes the message: Template loop detected: Template:ISO 639 name
- I'll try to patch Template:ISO 639 name to make the error go away. – wbm1058 (talk) 22:52, 3 April 2017 (UTC)
- A fix may already be in that template's sandbox from three years ago. – Jonesey95 (talk) 23:19, 3 April 2017 (UTC)
- This patch cleared the problem from Postbellum. – wbm1058 (talk) 23:21, 3 April 2017 (UTC)
- Yuck. Fix one issue and the side-effect of that is to introduce another. Now there are a ton of false-positive {{error}} transclusions.
- Taking this off the village pump; see Template talk:ISO 639 name#Return empty string for codes not on the list. @Jonesey95: you may be interested in this as I see you created Category:Articles containing unknown ISO 639 language template. – wbm1058 (talk) 18:33, 4 April 2017 (UTC)
- This patch cleared the problem from Postbellum. – wbm1058 (talk) 23:21, 3 April 2017 (UTC)
- A fix may already be in that template's sandbox from three years ago. – Jonesey95 (talk) 23:19, 3 April 2017 (UTC)