Comments on: Introduction to Clojure Web Development using Ring, Compojure and Sandbar

By: Mark

Mark — Wed, 19 Oct 2011 04:50:08 +0000

Siva, great post!

When I run “lein run address_book.core start”, lein reports the following error.

Exception in thread “main” java.lang.NoSuchMethodError: clojure.lang.RestFn.(I)V (params.clj:1)
at clojure.lang.Compiler.eval(Compiler.java:5440)
at clojure.lang.Compiler.eval(Compiler.java:5415)

Stack trimmed. Any thoughts on this error?

Thanks!

By: abimaran

abimaran — Tue, 13 Sep 2011 09:52:24 +0000

That’s a valuable, help! Thanks Simon Brooke….

By: Siva Jagadeesan

Siva Jagadeesan — Fri, 19 Aug 2011 21:56:06 +0000

In src/address_book/core.clj there is a start function. You can call that in a repl to start the server.

By: jvandal (@jvandal)

jvandal (@jvandal) — Sun, 14 Aug 2011 22:50:25 +0000

I try to run “http://localhost:8080″ and I get an error. I run Vista OS What makes the server active?
Thanks

By: Siva Jagadeesan

Siva Jagadeesan — Fri, 01 Jul 2011 22:10:20 +0000

Thanks a lot Simon …

By: Simon Brooke

Simon Brooke — Tue, 28 Jun 2011 12:32:01 +0000

OK, the problem is, there is no ‘edit-address-form’ so that the anonymous function defined at line 48 of address_list.js never gets called. If in both address_book.js and address_list.js, you replace all instances of ‘edit-address-form’ with ‘address-form’, the address to be edited gets loaded into the form on RHS of the index.html page. However, when the address is edited and the ‘create’ button pressed, although the log shows ‘Processing :put /addresses/1′, the address does not get updated.

Still investigating.

By: Simon Brooke

Simon Brooke — Tue, 28 Jun 2011 11:41:39 +0000

Two more minor things: the tutorial security-policy allows access to ‘addresses’ but not to ‘addresses.*’; consequently an attempt to edit an address results in ‘Processing :get /permission-denied’ appearing in the log (no error shown to the user).

When that change is made, an attempt to edit an address results in ‘Processing :get /addresses/1′ appearing in the log but no change appears on the screen – the address is /not/ loaded into the form. However as browsing to ‘http://localhost:8080/addresses/1′ results in

‘{“id”:”1″,”name”:”Siva Jagadeesan”,”street1″:”88 7th”,”street2″:”#203″,”city”:”Cupertino”,”country”:”USA”,”zipsourcecode”:98802}’

appearing in the browser, I suspect this is an issue either of templating or JavaScript rather than of authentication.

Still investigating, will post a fix when I find it.

By: Simon Brooke

Simon Brooke — Tue, 28 Jun 2011 11:03:32 +0000

In following this post through, I found I needed to modify the final ‘ns’ form to:

(ns address-book.core
(:use [compojure.core]
[ring.adapter.jetty]
[hiccup.core] ;; note: added
[sandbar.auth]
[sandbar.form-authentication]
[sandbar.stateful-session] ;; note: added
[sandbar.validation])
(:require [compojure.route :as route]
[address-book.middleware :as mdw]
[address-book.address :as address]
[address-book.auth :as auth]
[clj-json.core :as json]))

The post also doesn’t specify where the form-authentication-routes form goes; in fact it needs to go in the defroutes form, thus:

(defroutes rts
(GET “/” [] “Address Book!!”)
(GET “/addresses” [] (json-response (address/find-all)))
(GET “/addresses/:id” [id] (json-response (address/find id)))
(POST “/addresses” {params :params} (json-response (address/create params)))
(form-authentication-routes (fn [_ c] (html c)) (auth/form-authentication-adapter))
(route/files “/”)
(route/not-found “Page not found”))

Altogether an excellent and most useful tutorial, many thanks!

By: Sergey

Sergey — Thu, 09 Jun 2011 12:56:28 +0000

Sorry, now I see your intentions to place middleware in application-routes.

But then you miss the ability to reload handlers on the fly because you don’t do “(var rts)”, don’t you?

By: Sergey

Sergey — Thu, 09 Jun 2011 12:51:30 +0000

Oop, I mean:

14 (run-jetty #’rts

By: Sergey

Sergey — Thu, 09 Jun 2011 12:50:45 +0000

It’s more succint to use:

(run-jetty #’application-routes

(run-jetty (var application-routes)

instead of

10 (def application-routes
11 rts)

14 (run-jetty application-routes

By: lunamystry

lunamystry — Thu, 24 Mar 2011 08:00:42 +0000

I noticed that you don’t direct anything to port 8080. How is data sent to the port? What sends it?

By: ScriptDevil

ScriptDevil — Sun, 20 Mar 2011 07:48:45 +0000

You haven’t mentioned anywhere how we run the server. I tried ./compojure src/address_book/core.clj, but that just quits without any error

By: Ben

Ben — Fri, 21 Jan 2011 12:45:12 +0000

Hey Siva
yet another great post, thanks!

— Ben