Module:Sandbox/Rexxs/PropIDs

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-- This is used to get the QIDs of all of the values of a property, as a comma separated list if multiple values exist
-- Usage: {{#invoke:Sandbox/Rexxs/PropIDs |getPropertyIDs |<PropertyID> |FETCH_WIKIDATA}}
-- Usage: {{#invoke:Sandbox/Rexxs/PropIDs |getPropertyIDs |<PropertyID> |<InputParameter> |qid=<QID>}}

local p = {}

p.getPropertyIDs = function(frame)
	local propertyID = mw.text.trim(frame.args[1] or "")
	local input_parm = mw.text.trim(frame.args[2] or "")
	-- can take a named parameter |qid which is the Wikidata ID for the article. This will not normally be used.
	local qid = frame.args.qid
	if qid and (#qid == 0) then qid = nil end
	if input_parm == "FETCH_WIKIDATA" then
		local entity = mw.wikibase.getEntityObject(qid)
		local propclaims
		if entity and entity.claims then
			propclaims = entity.claims[propertyID]
		end
		if propclaims then
			-- if wiki-linked value collect the QID in a table
			if (propclaims[1] and propclaims[1].mainsnak.snaktype == "value" and propclaims[1].mainsnak.datavalue.type == "wikibase-entityid") then
				local out = {}
				for k, v in pairs(propclaims) do
					out[#out + 1] = "Q" .. v.mainsnak.datavalue.value["numeric-id"]
				end
				return table.concat(out, ", ")
			else
				-- not a wikibase-entityid, so return empty
				return ""
			end
		else
			-- no claim, so return empty
			return ""
		end
	else
		return input_parm
	end
end

return p