[web-devel] Potential gotcha in setSession/setCreds functions in Yesod

Michael Snoyman michael at snoyman.com
Wed Oct 20 22:16:48 CEST 2010

You're absolutely correct, I had intended to put that comment in. It
will be in the docs for 0.6.


On Wed, Oct 20, 2010 at 6:05 PM, Max Cantor <mxcantor at gmail.com> wrote:
> Maybe this is obvious to others, but it wasn't to me.  Any code that sets a cookie or session variable wont "take effect" until the next request.  Upon reflection, this should have been obvious to me because the session vars are read out of a Reader monad, but it wasnt..
> My point is that, you can't do something like:
> setCreds False creds
> m <- requireAuthId
> in a single request.  The simple solution is to stick a redirect in there.  Not suggesting any code changes, but a simple note in the haddocks :)
> Again, sry to bother if this should have been obvious too me.
> Max
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