CODEWITHSUNDEEP
clojure
TomJava
TomJava

Reputation: 529

Unable to run clara rules clojure program from eclipse

I am trying to learn clara rules - clojure which is present in "http://www.clara-rules.org/docs/firststeps/" 

(ns with-mongo.clara.example
   (:require [clara.rules :refer :all]))

(defrecord SupportRequest [client level])

(defrecord ClientRepresentative [name client])

(defrule is-important
  "Find important support requests."
  [SupportRequest (= :high level)]
  =>
  (println "High support requested!"))

(defrule notify-client-rep
  "Find the client representative and request support."
  [SupportRequest (= ?client client)]
  [ClientRepresentative (= ?client client) (= ?name name)]
  =>
  (println "Notify" ?name "that"  
          ?client "has a new support request!"))

Executing the following in REPL

 (-> (mk-session 'with-mongo.clara.example)
     (insert (->ClientRepresentative "Alice" "Acme")
                  (->SupportRequest "Acme" :high))
          (fire-rules))

But what I get in eclipse is CompilerException java.lang.RuntimeException: Unable to resolve symbol: fire-rules in this context, compiling:(C:\Users\x\AppData\Local\Temp\form-init8304513432405616575.clj:1:2)

Does anyone has any details on it?

Upvotes: 0

Views: 164

Answers (2)

TomJava
TomJava

Reputation: 529

The issue I was facing was due to the version mismatches

  :dependencies [[org.clojure/clojure "1.6.0"]
                 [com.novemberain/monger "3.0.0-rc2"]
                 [ring "1.4.0"]
                 [ring/ring-json "0.4.0"]
                 [compojure "1.4.0"]
                 [com.cerner/clara-rules "0.19.0"]])

I was using 1.6.0 for clojure and after updating to clojure "1.7.0". Clara rules are getting triggered. 

  :dependencies [[org.clojure/clojure "1.7.0"]
                 [com.novemberain/monger "3.0.0-rc2"]
                 [ring "1.4.0"]
                 [ring/ring-json "0.4.0"]
                 [compojure "1.4.0"]
                 [com.cerner/clara-rules "0.19.0"]])

Upvotes: 0

cfrick
cfrick

Reputation: 37008

You have not required clara.rules in your REPL beforehand. E.g. run

(require '[clara.rules :refer :all]))

first. (or run your own ns there first - that depends on how you want to run/use the REPL and what eclipse allows you to use (non-eclipse-user here))

So why does it complain about fire-rules and not mk-session? That is due to the way the threading macro -> works. If you macroexpand your code, that throws, you will see, that fire-rules is actually the first function called.

Upvotes: 0

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