Editing Module:ResolveEntityId/doc (section)

== Usage ==
Functions similarly to [[:mw:Extension:Wikibase_Client/Lua#mw.wikibase.resolvePropertyId|mw.wikibase.resolvePropertyId]], but for [[:wikidata:|Wikidata]] [[:mw:Extension:Wikibase_Client/Lua#mw.wikibase.entity|entities]] instead of properties.

Returns an entity id for the given label or id. This allows using the entity's labels instead of ids in all places. If no entity was found for the label or id, or if the label is ambiguous, a nil value is returned.

When attempting to resolve a label, only entities with English Wikipedia sitelinks are considered in the search. If a label exists in Wikidata, but does not have the requisite language sitelink, a nil value is returned.

=== Call from within a module (_id) ===
Example calls within a module might look like the following: 

{| class="wikitable"
|+ style="text-align:left"|
!Code !! Result !! Notes
|-
|<syntaxhighlight lang="lua">local resolveEntityId = require( "Module:ResolveEntityId" )._id
id = resolveEntityId('Q42')</syntaxhighlight>
|style="vertical-align: mid;"|<code>id</code> = <code>{{#invoke:ResolveEntityId|entityid|Q42|'''nil'''}}</code>
| "Q42" is a valid Wikidata ID, and a Wikidata items exists with that Id, so it is therefore returned intact
|-
|<syntaxhighlight lang="lua">local resolveEntityId = require( "Module:ResolveEntityId" )._id
id = resolveEntityId('Q0')</syntaxhighlight>
|style="vertical-align: mid;"|<code>id</code> = <code>{{#invoke:ResolveEntityId|entityid|Q0|'''nil'''}}</code>
| "Q0" is not a valid Wikidata ID, and while the Wikipedia article [[Q0]] exists, it is a disambiguation page, so <code>'''nil'''</code> is returned
|-
|<syntaxhighlight lang="lua">local resolveEntityId = require( "Module:ResolveEntityId" )._id
id = resolveEntityId('Q404')</syntaxhighlight>
|style="vertical-align: mid;"|<code>id</code> = <code>{{#invoke:ResolveEntityId|entityid|Q404|'''nil'''}}</code>
| "Q404" is a Wikidata redirect to Q395, so the latter is returned
|-
|<syntaxhighlight lang="lua">local resolveEntityId = require( "Module:ResolveEntityId" )._id
id = resolveEntityId('Q2147483647')</syntaxhighlight>
|style="vertical-align: mid;"|<code>id</code> = <code>{{#invoke:ResolveEntityId|entityid|Q2147483647|'''nil'''}}</code>
| Q2147483647 is a valid Wikidata ID, but no entity exists with that ID, so <code>'''nil'''</code> is returned
|-
|<syntaxhighlight lang="lua">local resolveEntityId = require( "Module:ResolveEntityId" )._id
id = resolveEntityId('Douglas Adams')</syntaxhighlight>
|style="vertical-align: mid;"|<code>id</code> = <code>{{#invoke:ResolveEntityId|entityid|Douglas Adams|'''nil'''}}</code>
| The article [[Douglas Adams]] exists and has the Wikidata ID "Q42", so that is returned.
|-
|<syntaxhighlight lang="lua">local resolveEntityId = require( "Module:ResolveEntityId" )._id
id = resolveEntityId('ThisIsNotARealWikidataItem')</syntaxhighlight>
|style="vertical-align: mid;"|<code>id</code> = <code>{{#invoke:ResolveEntityId|entityid|ThisIsNotARealWikidataItem|'''nil'''}}</code>
| "ThisIsNotARealWikidataItem" is not a valid Wikidata ID, and no Wikipedia article exists at [[ThisIsNotARealWikidataItem]], so <code>'''nil'''</code> is returned
|-
|<syntaxhighlight lang="lua">local resolveEntityId = require( "Module:ResolveEntityId" )._id
id = resolveEntityId('ThisIsNotARealWikidataItem', 'Wikidata ID not found!')</syntaxhighlight>
|style="vertical-align: mid;"|<code>id</code> = <code>{{#invoke:ResolveEntityId|entityid|ThisIsNotARealWikidataItem|'Wikidata ID not found!'}}</code>
| Same as above, but the custom error message <code>Wikidata ID not found!</code> is returned
|-
|<syntaxhighlight lang="lua">local resolveEntityId = require( "Module:ResolveEntityId" )._id
id = resolveEntityId('Douglas adams')</syntaxhighlight>
|style="vertical-align: mid;"|<code>id</code> = <code>{{#invoke:ResolveEntityId|entityid|Douglas adams|'''nil'''}}</code>
| "Douglas adams" is not a valid Wikidata ID, and while [[Douglas adams]] (with a lower-case "a") exists, it is a redirect to [[Douglas Adams]]. Therefore the Wikidata ID for the latter page is returned
|-
|<syntaxhighlight lang="lua">local resolveEntityId = require( "Module:ResolveEntityId" )._id
id = resolveEntityId('Wikipedia:Village pump (technical)/Archive 1')</syntaxhighlight>
|style="vertical-align: mid;"|<code>id</code> = <code>{{#invoke:ResolveEntityId|entityid|Wikipedia:Village pump (technical)/Archive 1|'''nil'''}}</code>
| "Wikipedia:Village pump (technical)/Archive 1" is not a valid Wikidata ID, and while [[Wikipedia:Village pump (technical)/Archive 1]] exists, it does not have a Wikidata ID, so <code>'''nil'''</code> is returned
|}

=== Use from within a template (entityid) ===
The following will return the entity id (or nothing if the ID doesn't exist):
<code><nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|entityid|''id''}}</code>

The following will return the entity id (or the alternate text if the ID doesn't exist):
<code><nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|entityid|''id''|''alternate text if ''id'' is '''nil'''''}}</code>

=== Former _entityid function===
The <code>_entityid</code> function, which required that the frame be passed as the first argument, has been removed from the module because workarounds are no longer needed for [[:phab:T143970]].

<includeonly>{{#ifeq:{{SUBPAGENAME}}|sandbox | |
<!-- Categories below this line, please; interwikis at Wikidata -->
[[Category:Wikidata modules]]
}}</includeonly>