Module:ResolveEntityId

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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 Lua module is used on approximately 468,000 pages, or roughly 1% of all pages.
To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Consider discussing 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	Notes
local resolveEntityId = require( "Module:ResolveEntityId" )._id id = resolveEntityId('Q42')	`id` = `Lua error: bad argument #1 to 'sub' (string expected, got table).`	"Q42" is a valid Wikidata ID, and a Wikidata items exists with that Id, so it is therefore returned intact
local resolveEntityId = require( "Module:ResolveEntityId" )._id id = resolveEntityId('Q0')	`id` = `Lua error: bad argument #1 to 'sub' (string expected, got table).`	"Q0" is not a valid Wikidata ID, and while the Wikipedia article Q0 exists, it is a disambiguation page, so `nil` is returned
local resolveEntityId = require( "Module:ResolveEntityId" )._id id = resolveEntityId('Q404')	`id` = `Lua error: bad argument #1 to 'sub' (string expected, got table).`	"Q404" is a Wikidata redirect to Q395, so the latter is returned
local resolveEntityId = require( "Module:ResolveEntityId" )._id id = resolveEntityId('Q2147483647')	`id` = `Lua error: bad argument #1 to 'sub' (string expected, got table).`	Q2147483647 is a valid Wikidata ID, but no entity exists with that ID, so `nil` is returned
local resolveEntityId = require( "Module:ResolveEntityId" )._id id = resolveEntityId('Douglas Adams')	`id` = `Lua error: bad argument #1 to 'sub' (string expected, got table).`	The article Douglas Adams exists and has the Wikidata ID "Q42", so that is returned.
local resolveEntityId = require( "Module:ResolveEntityId" )._id id = resolveEntityId('ThisIsNotARealWikidataItem')	`id` = `Lua error: bad argument #1 to 'sub' (string expected, got table).`	"ThisIsNotARealWikidataItem" is not a valid Wikidata ID, and no Wikipedia article exists at ThisIsNotARealWikidataItem, so `nil` is returned
local resolveEntityId = require( "Module:ResolveEntityId" )._id id = resolveEntityId('ThisIsNotARealWikidataItem', 'Wikidata ID not found!')	`id` = `Lua error: bad argument #1 to 'sub' (string expected, got table).`	Same as above, but the custom error message `Wikidata ID not found!` is returned
local resolveEntityId = require( "Module:ResolveEntityId" )._id id = resolveEntityId('Douglas adams')	`id` = `Lua error: bad argument #1 to 'sub' (string expected, got table).`	"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
local resolveEntityId = require( "Module:ResolveEntityId" )._id id = resolveEntityId('Wikipedia:Village pump (technical)/Archive 1')	`id` = `Lua error: bad argument #1 to 'sub' (string expected, got table).`	"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 `nil` is returned

Use from within a template (entityid)

The following will return the entity id (or nothing 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}}

Former _entityid function

The _entityid 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.

The above documentation is transcluded from Module:ResolveEntityId/doc.
Editors can experiment in this module's sandbox and testcases pages.
Subpages of this module.

local p = {}

function p.getEntity(frame)
   local z=mw.wikibase.getEntity(frame.args[1])
end

function p.entityid(id)
	id = mw.ustring.upper(mw.ustring.sub(id,1,1))..mw.ustring.sub(id,2)
	if type(entityObject) == 'string' then
		if mw.ustring.match('123','^Q%d+$') then
			if frame:preprocess("{{#iferror:{{#invoke:ResolveEntityId|getEntity|".. id .. "}}|error}}") ~= "error" then
				return id
			end
		else
			return mw.wikibase.getEntityIdForTitle(id)
		end
	end
	return nil
end

function p.resolveEntityId(frame)
	if  frame:getParent() then
		return p.entityid(frame.getParent.args[1])
	else
		return p.entityid(frame.args[1])
	end
end

return p