Template:Get QID

Lua error in Module:Deprecated at line 18: assign to undeclared variable 'warn'.

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This template is used on approximately 551,000 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 unique identifier (QID) that corresponds to the Wikipedia page (or redirection page) title (known in Wikidata terminology as a Wikidata item's Wikipedia sitelink, not to be confused with its label) specified in the first unnamed parameter. 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 given ({{Get QID}}), it retrieves the QID of the current page. If the qid parameter is defined ({{get QID}}) the template just passes the given value on.

Current page

Example:

{{Get QID}} → Lua error in Module:Deprecated at line 18: assign to undeclared variable 'warn'.

gives the QID of the current Wikipedia page, or an empty text string if no QID is defined.

Articles sharing the same label

The template does not do lookups of a Wikidata label, but of a Wikipedia page title. For example, the following two pages have the same Wikidata label, Mars:

{{Get QID|Mars}} → Lua error in Module:Deprecated at line 18: assign to undeclared variable 'warn'.
{{Get QID|Mars (mythology)}} → Lua error in Module:Deprecated at line 18: assign to undeclared variable 'warn'.

The template will return the QIDs of Mars (planet) and Mars (mythology) respectively.

Redirection page

The page universes is a redirect to universe, and does not have its own defined Wikidata item:

{{Get QID|universes}} → Lua error in Module:Deprecated at line 18: assign to undeclared variable 'warn'.

gives the QID of the page universe.

Usage together with the Q template:

{{Q|{{Get QID|universes}}}}  → Lua error in Module:Wd at line 633: attempt to index field 'wikibase' (a nil value). (QLUA ERROR IN MODULE:DEPRECATED AT LINE 18: ASSIGN TO UNDECLARED VARIABLE 'WARN'.)

Redirection page with its own Wikidata item

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

{{Q|{{Get QID|Maryport New Lighthouse}}}} → Lua error in Module:Wd at line 633: attempt to index field 'wikibase' (a nil value). (QLUA ERROR IN MODULE:DEPRECATED AT LINE 18: ASSIGN TO UNDECLARED VARIABLE 'WARN'.)

Passing QID parameter on

{{Get QID|qid=Q111}} → Lua error in Module:Deprecated at line 18: assign to undeclared variable 'warn'.

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)}} → Lua error in Module:Wd at line 633: attempt to index field 'wikibase' (a nil value).
{{#invoke:WikidataIB|getEntityFromTitle|Mars (mythology)}} → Lua error in Module:Deprecated at line 18: assign to undeclared variable 'warn'.

but they do not follow redirects.

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

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