Permanently protected module

Module:ResolveEntityId

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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 entitiy was found for the label or id, or if the label is ambiguous, 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 = Q395
local resolveEntity = require( "Module:ResolveEntityId" )
id = resolveEntity._id('Q151384451555')
id = nil
local resolveEntity = require( "Module:ResolveEntityId" )
id = resolveEntity._id('Douglas Adams')
id = Q42
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