First , very thanks for you reply and very detailed explaining about "refer". in fact refer-clojure is variant of (refer 'clojure.core). what clojureql does is refer clojure exclude distinct, conj and etc, and redefine a itself version of distinct in which refer clojure/distinct. you can read it's source code at github.com. what make me puzzled is clojureql.core will not include the var of distinct with (refer- clojure :include [distinct]), then clojureql.core can def its own distinct with any conflict. This is also the original idea of refer- clojure with :exclude. Okey, clojureql.core does very well in how to use "refer" and no any issues. Why some warning of conflit be reported in the cmd of win when the lein run myoa/core.clj? and when I refresh the browser the system will failed with lots of error messsage?
Sincerely Limux On 4月11日, 上午6时37分, Meikel Brandmeyer <m...@kotka.de> wrote: > Hi, > > Am 10.04.2011 um 14:37 schrieb limux: > > > java.lang.IllegalStateException: distinct already refers to: > > #'clojureql.core/distinct in namespace: myoa.core (core.clj:1). but in > > clojureql/core.clj has already (:refer-clojure > > :exclude [take drop sort distinct conj! disj! compile case]). > > What clojureql does is only of importance to clojureql. What happens is that > your namespace (myoa.core) "use"s clojureql and then tries to define an own > Var named distinct. This leads to the problem. To fix this you have to > exclude the clojureql distinct from the use clause. (ns myoa.core (:use > [clojureql.core :exclude (distinct)])) > > Here for illustration of what happens. The refers can be read as use clauses > in the ns definition. (I just used refer, because I don't have the > corresponding files. use is basically refer + loading from the file.) > > user=> (ns foo.bar) > nil > foo.bar=> (def x 5) > #'foo.bar/x > foo.bar=> (ns yoyo.dyne) > nil > yoyo.dyne=> (refer 'foo.bar) > nil > yoyo.dyne=> (def x 6) > java.lang.IllegalStateException: x already refers to: #'foo.bar/x in > namespace: yoyo.dyne (NO_SOURCE_FILE:5) > yoyo.dyne=> (ns frob.nicate) > nil > frob.nicate=> (refer 'foo.bar :exclude '(x)) > nil > frob.nicate=> (def x 7) > #'frob.nicate/x > > Hope this helps. > > Sincerely > Meikel -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
