The issue is that instead of passing findParam and findUsers as arguments
to async.waterfall, you're calling them and passing the results (which is
undefined).
You want:
async.waterfall(
[
async.apply(findParam, user.key), // <-- this will pass
user.key as the 1st argument to findParam, and async will pass the callback
findUsers // <-- waterfall automatically passes the results
from findParam's callback(err, user, param) to findUsers as parameters
(except err)
], callback);
I hope that's helpful.
-Ben
On Thursday, May 15, 2014 5:35:07 AM UTC-7, Charlie Camus wrote:
>
> Hi,
>
> I'm trying to launch asynchronous method on serie way with async, But, you
> guess it, I can't did it.
> Here is my code :
>
> function findParam(userKey,callback){
> console.log("looking for params "+userKey);
> params.get(userKey,
> function(err, result, key) {
> var param = result;
> param.key=key;
> console.log("findParam "+param);
> callback(err, userKey, param);
> });
> console.log("done");
> }
>
> function findUsers(userKey,param, callback){
> console.log("looking fo uers "+userKey);
> console.log("Param "+param);
> users.get(userKey,
> function(err, result, key) {
> var user = result;
> user.key=key;
> console.log("user "+user);
> callback(err, user, param);
> });
> }
>
> launch code :
>
> var user = findUserBySession(req.sessionID);
> async.waterfall(
> [
> findParam(user.key, callback),
> findUsers(arg1, arg2, callback)
> ]);
>
> the stack trace :
> looking for params 3edgl89
> done
> ReferenceError: arg1 is not defined... (lot of errors)
> findParam [object Object]
>
> That stack trace revealed to me that the second method is launched before
> the param was found. This is why the error appeared.
> Can you help me ? What have I done wrong ?
>
> Thank you !
>
--
Job board: http://jobs.nodejs.org/
New group rules:
https://gist.github.com/othiym23/9886289#file-moderation-policy-md
Old group rules:
https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines
---
You received this message because you are subscribed to the Google Groups
"nodejs" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/nodejs/dbe1b061-f58a-4923-97cb-9f57fce809b5%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
