Module:ResolveEntityId

This module is rated as beta, and is ready for widespread use. It is still new and should be used with some caution to ensure the results are as expected.

This template is used on ~1200000 pages.
To avoid large-scale disruption and unnecessary server load, any changes should first be tested in this template's /sandbox or/testcases subpage, or in your own user space. The tested changes can then be added in one single edit to this template. Please consider discussing any changes on the talk page before implementing them.

Usage

Functions similarly to mw.wikibase.resolvePropertyId, but for Wikidata 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:


Code	Result
local resolveEntity = require( "Module:ResolveEntityId" ) id = resolveEntity._id('Q42')	`id` = `Q42`
local resolveEntity = require( "Module:ResolveEntityId" ) id = resolveEntity._id('Q0')	`id` = `nil`
local resolveEntity = require( "Module:ResolveEntityId" ) id = resolveEntity._id('Q404')	`id` = `Q404`
local resolveEntity = require( "Module:ResolveEntityId" ) id = resolveEntity._id('Q151384451555')	`id` = `nil`
local resolveEntity = require( "Module:ResolveEntityId" ) id = resolveEntity._id('Douglas Adams')	`id` = `nil`
local resolveEntity = require( "Module:ResolveEntityId" ) id = resolveEntity._id('ThisIsNotARealWikidataItem')	`id` = `nil`
local resolveEntity = require( "Module:ResolveEntityId" ) id = resolveEntity._id('ThisIsNotARealWikidataItem', 'Wikidata ID not found!')	`id` = `'Wikidata ID not found!'`

Use from within a template (entityid)

The following will return the entity id (or nil if the ID doesn't exist): {{#invoke:ResolveEntityId|entityid|id}}

The following will return the entity id (or the alternate text if the ID doesn't exist): {{#invoke:ResolveEntityId|entityid|id|alternate text if id is nil}}

Deprecated (_entityid)

The _entityid function, which required that the frame be passed as the first argument, has been deprecated because workarounds are no longer needed for phab:T143970.

local p = {}

function p._entityid(_,id,alt)
	-- backwards compatibility for deprecated _entityid function
	return p._id(id,alt)
end

function p._id(id,alt)
	if type(id) == 'string' then
		id = mw.ustring.upper(mw.ustring.sub(id,1,1))..mw.ustring.sub(id,2)
		if mw.ustring.match(id,'^Q%d+$') then
			-- id is in the proper format for a Wikidata entity
			if mw.wikibase.isValidEntityId(id) then
				-- id is valid
				id = mw.wikibase.getEntity(id)
				if id then
					-- entity exists
					return id.id
				end
			end
		else
			id = mw.wikibase.getEntityIdForTitle(id)
			if id then
				-- id is a title that matches a Wikidata entity
				local instanceOf = mw.wikibase.getBestStatements(id, 'P31')[1] --instance of
				if instanceOf and instanceOf.mainsnak.datavalue.value.id ~= 'Q4167410' then
					-- not disambiguation
					return mw.wikibase.getEntity(id).id
				elseif instanceOf == nil then
					-- id is a title, but is missing an instance-of value
					return mw.wikibase.getEntity(id).id
				end
			end
		end
	end
	return alt or nil
end

function p.entityid(frame)
	return p._id(frame.args[1], frame.args[2])
end

return p