Not-found is not the same is not-nil. Is it possible that
this-users-converstation *does* have an :incoming-message key with a nil
value?
See the difference between these two cases:
(get {} :a :not-found)
=> :not-found
(get {:a nil} :a :not-found)
=> nil
Notice also that records always "have" keys that are defined on them even
if they are not set:
(defrecord Rec [a])=> user.Rec
(get (map->Rec {}) :a :not-found)
=> nil
Perhaps you want to use or instead?
(or (get this-users-conversation :incoming-message) "")
Or figure out why nil is written and prevent it?
On Friday, October 16, 2015 at 1:33:29 PM UTC-5, Lawrence Krubner wrote:
>
> What am I doing wrong here? I want to call clojure.string/lower-case on
> the :incoming-message of this-users-conversation. If there is no message, I
> return an empty string.
>
>
> (defn discern-current-state [this-users-conversation]
> (cond
> (= (clojure.string/lower-case (get this-users-conversation
> :incoming-message "")) "yes") (assoc this-users-conversation :current-state
> :salesforce-write)
>
>
> and yet the error points to the above line:
>
> java.lang.NullPointerException {:class java.lang.NullPointerException,
> :message nil, :trace-elems ({:anon-fn false, :fn "lower-case", :ns
> "clojure.string", :clojure true, :file "string.clj", :line 215} {:anon-fn
> false, :fn "discern-current-state", :ns "nlph.event-bus", :clojure true,
> :file "event_bus.clj", :line 92}
>
>
> but of course, at the REPL, everything works as I would expect:
>
> (def users {:message "hello"})
> #'nlph.core/users
>
> nlph.core=> (clojure.string/lower-case (get users :message))
> "hello"
>
> nlph.core=> (clojure.string/lower-case (get users :message ""))
> "hello"
>
> nlph.core=> (clojure.string/lower-case (get users :lisa))
>
> NullPointerException clojure.string/lower-case (string.clj:215)
>
> nlph.core=> (clojure.string/lower-case (get users :lisa ""))
> ""
>
> nlph.core=> (clojure.string/lower-case (get users :lisa))
>
> NullPointerException clojure.string/lower-case (string.clj:215)
>
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