meteor - Problems with Iron Router and function computation + template rendering -

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i have issue template rendering before subscription received server + computation function calculates necessary data render it. sometimes, works fine , process first subscribes mongodb, renders computevalues() function , loads template. when try same thing again, template renders before actual data calculated , results in below error:

exception in template helper: typeerror: cannot read property 'length' of undefined

that tells me computevalues() function ran without getting data subscription, went through empty db , couldn't calculation properly.

here iron:router code:

router.route("/management/bankroll", { subscriptions: function(){   return meteor.subscribe("bank"); }, action: function(){ this.wait(computevalues());  if(this.ready()){   this.layout("bankroll"); } else{   this.layout("loading"); } }, name: "bankroll" });

i tried kinds of hooks onbeforeaction, used .wait()...pretty , behavior still same. 1 instance, upload works , template rendering waits until data pulled it's supposed to, , if try again, compute function runs before subscription received.

i have used waiton subscription , doesn't work either.
it's template renders before computevalues function calculation due not being able retrieve subscription in time. happens more in larger files retrieving subscription takes longer.

anyone know issue is?


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