alter argu position, handle null rank

lua/insert_sorted.lua

@@ -1,10 +1,17 @@
 local key = KEYS[1]
-local member = ARGV[2]
-local score = ARGV[1]
+local member = ARGV[1]
+local score = ARGV[2]
 
 local count = redis.call("ZCARD", key)
 local curPosition = redis.call("ZSCORE", key, member)
 
+-- if game is featured but no new position is given
+if (score == nil and curPosition ~= false) then
+	return 0
+else
+	score = count + 1
+end
+
 -- if game is not yet featured
 if curPosition == false then
 	local items = redis.call("ZRANGEBYSCORE", key, score, count)

views/game/featured.js

@@ -78,6 +78,10 @@ module.exports = function(server) {
                 description: 'Game slug',
                 isRequired: true
             },
+            rank: {
+                description: 'Game rank',
+                isRequired: false;
+            },
             genres: {
                 description: 'List of genres',
                 isRequired: false