Collate a Hash in Redis

collate.lua

--EVAL "this script" 1 some-hash-key
local key = KEYS[1];
local keyvalues = redis.call('HGETALL', key);
local result = {};

--every other value is a key
for idx = 1, #keyvalues, 2 do
    result[keyvalues[idx]] = keyvalues[idx + 1]
end

return cjson.encode(result);