Comments for Tech behind Tech

Comment on Compojure Demystified with an example – Part 1 by Jim Smiley

Jim Smiley — Mon, 16 Jan 2012 05:14:43 +0000

Hi,
I am looking
g at your project. It looks interesting. I downloaded part 1 and ran lein deps.
How do i run it to see what it is doing.?
I am trying to learn Clojure.

Comment on Clojure Macros Simplified by adria

adria — Tue, 10 Jan 2012 02:33:29 +0000

Thank you, I need to read a lot of macro examples to understand it.

Comment on Parsing XML in Clojure by Otavio Macedo

Otavio Macedo — Mon, 02 Jan 2012 12:50:07 +0000

Hey, Siva,

I have been playing with your example, making slight changes to understand what each function does. Could you explain me why does this code doesn’t work?

(get-value xml :friends :person :name)

Thank you

Comment on Leiningen – Adding git submodule to Leiningen project by dave

dave — Sat, 17 Dec 2011 04:54:04 +0000

however, if you add the :checkout-deps-shares option this can be resolved and you can include these dependencies

e.g:

:checkout-deps-shares [:source-path :test-path
~(fn [p] (str (:root p) “/lib/*”))]

I am not sure, yet, as to whether this will work if you had more checkouts in a checkouts module.
My suspicion would be no. but I have not looked.

Comment on Leiningen – Adding git submodule to Leiningen project by dave

dave — Sat, 17 Dec 2011 04:22:42 +0000

This is a useful feature,

but, you will need to include all of the module dependencies manually, “lein deps” will not look into submodules

Comment 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!

Comment on Introduction to Clojure Web Development using Ring, Compojure and Sandbar by abimaran

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

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

Comment on Introduction to Clojure Web Development using Ring, Compojure and Sandbar 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.

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

Comment on Compojure Demystified with an example – Part 4 by Emiliano Zilocchi

Emiliano Zilocchi — Sun, 14 Aug 2011 13:29:04 +0000

First of all thanks for this great tutorial!, in just a few minutes you can see a web application up and running with Clojure.
Just a quick comment, I had to add this line: “:repl-init address_book.webserver” to project.clj and then run: “lein repl” instead of “lein swank”. Otherwise my browser stayed loading forever and nothing happened.
Thanks again for all this info!

Comment on Compojure Demystified with an example – Part 2 by William Roe

William Roe — Sun, 17 Jul 2011 15:36:41 +0000

The repl line doesn’t work any more :

address_book% lein repl src/address_book/core.clj
Wrong number of arguments to repl task.
Expected ([] [project])

It looks like the best way to achieve that is to add:
:repl-init address_book.core
to the project.clj file – then you can run “lein repl”.

Comment on Introduction to Clojure Web Development using Ring, Compojure and Sandbar by Siva Jagadeesan

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

Thanks a lot Simon …

Comment on Introduction to Clojure Web Development using Ring, Compojure and Sandbar 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.

Comment on Introduction to Clojure Web Development using Ring, Compojure and Sandbar 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.

Comment on Introduction to Clojure Web Development using Ring, Compojure and Sandbar 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!

Comment on Compojure Demystified with an example – Part 4 by angel

angel — Sun, 26 Jun 2011 03:55:46 +0000

Hi…I think github project has a problem with the routes..I download it and run well, but when I try save the dates I get in http://localhost:8080/addresses “Page no found”…I would try check it..I suspect than would be a problem with the underscore _ and – but I’m not sure

thanks for the great tutorial

Comment on Introduction to Clojure Web Development using Ring, Compojure and Sandbar 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?

Comment on Introduction to Clojure Web Development using Ring, Compojure and Sandbar by Sergey

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

Oop, I mean:

14 (run-jetty #’rts

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

Comment on Compojure Demystified with an example – Part 3 by Kristabelle

Kristabelle — Sat, 16 Apr 2011 06:13:22 +0000

Stands back from the keyboard in amaemzent! Thanks!