Template:Get QID/sandbox

__EXPECTUNUSEDTEMPLATE__This is the template sandbox page for Template:Get QID (diff).
See also the companion subpage for test cases.

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This template is used on approximately 475,000 pages, or roughly 3% of all pages.
To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.

This template uses Lua:

Usage

This template retrieves the Wikidata QID that corresponds to the Wikipedia page title or redirection page title specified in the first unnamed parameter (also known as Wikipedia sitelink, not to be confused with the Wikidata label). If a page is moved, a {{Get QID|<page title>}} call referring to its former title typically still works, since the template follows the redirection destination, if the redirection source does not have a Wikidata item of its own. If no parameter is defined ({{Get QID}}), it retrieves the QID of the current page. If the qid parameter is defined ({{get QID}}) it just passes it on.

Current page

Example:

{{Get QID}} →

gives the QID of the currently showed Wikipedia page, or an empty text string if no QID is defined:

Articles sharing the same label

The template does not use the Wikidata label, but the Wikipedia page title. For example, the following two pages share the same Wikidata label Mars:

{{Get QID|Mars}} → 
{{Get QID|Mars (mythology)}} →

This gives the QID:s of Mars (planet) and Mars (mythology) respectively.

Redirection page

{{Get QID|universes}} →

gives the QID of the page universe, since universes is redirected to that article, and does not have a Wikidata item of its own.

Usage together with the Q template:

{{Q|{{Get QID|universes}}}}  → (no entity)

Redirection page with its own Wikidata item

Maryport New Lighthouse is redirected to Maryport Lighthouse, both having separate Wikidata items:

{{Q|{{Get QID|Maryport New Lighthouse}}}} → (no entity)

Passing QID parameter on

{{Get QID|qid=Q111}} → Q111

Substitution

To make Wikipedia faster, and to make the result less vulnerable to future deletion of redirects, this template may be substituted: {{subst:Get QID|<page title>}}, for example:

{{subst:Get QID|universe}} → Q1

which is immediately replaced by the resulting QID when saved.

However, a purpose of this template is to make the wikicode more comprehensible by avoiding QID codes, which substitution counteracts.

Other ways of getting the QID

Invoking these modules may also provide the QID for a certain Wikipedia page title:

{{#invoke:wd|label|raw|page=Mars (mythology)}} → 
{{#invoke:WikidataIB|getEntityFromTitle|Mars (mythology)}} →

but they do not follow redirects.

The following module provides the page title of a redirect destination:

{{#invoke:Redirect|main|Universes}} → Universes