What does 'java.lang.ClassCastException: clojure.lang.Var$Unbound cannot be
cast to clojure.lang.IDeref' mean. I'm getting this a lot and I want to
understand it better, make it easier for me to avoid this. Most of the time
I just end up adjusting my def/defn's around until it works. This is
I think what you actually want is:
(defn get-id []
(session/get :uid))
in your code, you're trying to call #'session/get directly and bind it
to get-id. Of course, the problem with this is that #'session/get
expects to be called in the context of a request which is where your
Unbound var
Hi Travis,
(def get-id
(session/get :uid))
(defn set-user! [user]
(session/put! :uid {:_id user}))
Only set-user! is a function here. The value of get-id is evaluated at
compile-time.
I don't know about the implementation of noir.session/get, but the error
message suggests that it uses
Thank you for your responses. This was failing for me in the Noir server,
so I assumed the same error meant the same thing in the REPL. Something was
different though, changing it to (defn get-id ...) and a couple other minor
tweaks and it's working.
On Monday, April 30, 2012 9:31:17 PM
