ReadObjectEncode.lua

local nk = require("nakama")

local function ReadObjectEncode(context, payload)

  local user_id = "removed-for-sharing-on-gist" -- some user ID.

  local json = nk.json_decode(payload)

  local object_ids = {
    {collection = json.collection, key = json.key, user_id = user_id}
  }
  local objects = nk.storage_read(object_ids)
   for _, r in ipairs(objects)
   do
     return nk.json_encode(r.value)
   end
  return "Wrong collection/key"
end

nk.register_rpc(ReadObjectEncode, "read_object_encode")