Module:ResolveEntityId

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

An example call within a module might look like the following:

local resolve = require( "Module:ResolveEntityId" )
id = resolve._entityid(frame, 'Q42')

which would result in id = Q42

local resolve = require( "Module:ResolveEntityId" )
id = resolve._entityid(frame, 'Douglas Adams')

which would result in id = Q42

local resolve = require( "Module:ResolveEntityId" )
id = resolve._entityid(frame, 'Q0')

which would result in id = nil

Use from within a template

{{#invoke:ResolveEntityId|entityid|id}}

---

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

This module "ResolveEntityId" is from Wikipedia if otherwise notified