Question

I have created a record like this:

(defrecord User [user-id email])

:but when I try to access it from another name-space I get the error:

(User. "name" "email")

java.lang.IllegalArgumentException: Unable to resolve classname: User

It works when I do:

(oe.model.modelcore.User. "name" "email")

: I know I will need to import the Java class, but is there any way for clojure to do this automatically when I do:

(use 'oe.model.modelcore :reload)

Answer 1

Technically you must require it (don’t necessarily need to use it) so that the file containing the record definition is compiled and the class is created. Then you must import it so that it is available to construct as a Java class. If you create a constructor function in the first ns like

(defn new-user [id email] 
  (User. id email))

then you will not need to import it in the calling ns.

I wrote this up a while back here:

• http://tech.puredanger.com/2010/06/30/using-records-from-a-different-namespace-in-clojure/