Help talk:Duplicate parameters Source: en.wikipedia.org/wiki/Help_talk:Duplicate_parameters

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Is there any possibiltiy to exclude a template from being listed in case the double definition is for this particular template (not only one instance but globally) intended and meaningful? Regards Draco flavus (talk) 08:40, 16 February 2021 (UTC)[reply]

@Draco flavus: No. Do you have an example of such a template? PrimeHunter (talk) 08:58, 16 February 2021 (UTC)[reply]

@PrimeHunter: Not on this wiki (however there is one on the Polish wikisource). It is still on experimental stage. The idea behind it is: called without a special parameter reference it simply takes the last instance of the named parameter, called with the parameter reference inherits all parameters from the referenced instance of the template above the other special (pseudo)-parameter CUT.

Page one:

{{MyTemplate
|parameter1=abc
|parameter2=def
|parameter3=ghi
|parameter4=jkl
|CUT=---
|parameter1=mno
|parameter5=stu
}}

On another page:

{{MyTemplate
|reference=Page one
|parameter2=pqr
}}

which effectively evaluates to:

{{MyTemplate
|parameter1=abc
|parameter2=pqr
|parameter3=ghi
|parameter4=jkl
}}

It works quite fine, however Page one is reported as page with duplicated definition of a parameter. For the productive stage it is simply not elegant and maybe prone to other undesired effects.

Draco flavus (talk) 09:25, 16 February 2021 (UTC)[reply]

@Draco flavus: You didn't give a real example. Even with the duplicate warning appearing I don't know how MyTemplate could be coded, unless it reads the wikitext of Page one and parses it instead of letting MediaWiki do it. Page one itself could say <includeonly>|parameter1=abc</includeonly> to avoid the warning on that page. PrimeHunter (talk) 11:38, 16 February 2021 (UTC)[reply]

@PrimeHunter: Thanks, The teplate is here {{s:pl:Template:Dane tekstu2}} which calls the function (coded in Lua) {{s:pl:Modul:Sandbox/Draco flavus/TestFields4|FindFields}} . It reads the source code of the page. Regards Draco flavus Draco flavus (talk) 13:11, 16 February 2021 (UTC)[reply]

The links are s:pl:Template:Dane tekstu2 and s:pl:Module:Sandbox/Draco flavus/TestFields4. As I suspected, it reads the wikitext and parses it by itself. That's not really how MediaWiki is supposed to be used. If you do your own parsing then there are many ways to avoid the duplicate argument issue. You can just choose a format which doesn't have a duplicate argument when MediaWiki parses it. PrimeHunter (talk) 13:28, 16 February 2021 (UTC)[reply]

What about duplicated issn numbers when they are already present in an original reference of a scientific paper directly fetched from the publisher site? What number to keep? The first one or the second one? To avoid to loose information, I often create two | issn = | fields, being aware that only the second field will appear in the reference of the paper on the page.

The script findargdups used to clean duplicate template arguments removes the first occurrence of the issn number. is it the right way to proceed?

How to best tackle this kind of issue with a reference arising from the publisher of the paper. In advance, thanks for your answer. Shinkolobwe (talk) 19:05, 19 February 2022 (UTC)[reply]

Keep the ISSN that matches the source you are citing. See the documentation for {{Cite journal}} if you are using that template. – Jonesey95 (talk) 18:00, 20 February 2022 (UTC)[reply]

Mea culpa; I'm the one who took out the duplicate issn's. However, I've since discovered that {{cite journal}} has an "eissn" parm for the electronic version of the issn. (documentation here). I've restored the ones I took out as "eissn"s, here & here. Davemck (talk) 18:19, 20 February 2022 (UTC)[reply]

This

{{Cite AV media |... |language=ga, en |... |language=ga |... }}

gives warning message Template:Cite AV media with more than one value for the "language" parameter. My initial fix was

{{Cite AV media |... |language=ga |... |language=ga |... }}

Only later did I realise that was not the issue.

I doubt if this precise gotcha happens very often, but ideally the warning message would be less ambiguous. The actual problem was "more than one instance of the parameter" whereas I interpreted it as "more than one value for an instance of the parameter". jnestorius^(talk) 21:01, 1 March 2025 (UTC)[reply]

That's a pretty rare case. We might change it to say simply "with more than one "xx" parameter. Only the last parameter provided will be used." That might be clearer. – Jonesey95 (talk) 17:36, 3 March 2025 (UTC)[reply]