on the edge of Complexity

Coffescript iteration caveat

2011-06-28T05:32:00.003+09:00

In Cofffeescript, there are 2 built-in sytanxes for interation. for .. of .. / for .. in .. (by ..)

In Pragmatic Coffeescript book, the author says,

" Why have a seperate syntax? Why not just use for key, value of array?Because there're nothing stopping an array from having extra methods or data. If you want the whole shebang, then sure, use of. But if you just want to treat the array as an array, use in -- you will onlyget array[0], array[1], etc., up to array[array.length-1], in that order"

how to get OAuth Consumer Key / Secret for Google OAuth

2011-01-11T08:57:00.007+09:00

I spent a hour to understand how to generate OAuth comsumer key for Google OAuth.
Here is the easiest way to do it.

step 0> visit Manage Domains Tool

step 1> Insert meta tag in your html and upload it server that is running.

step 2> after uploading the page, click verify. And then you'll see a page like this in you google master.

step 3> Generating keys using OpenSSL. I assume you're using OS X. Do this in your terminal

step4> Upload myrsacert.pem

Resources for learning node.js

2010-11-11T00:45:00.001+09:00

Resources for learning node.js

Tutorials - Article

http://howtonode.org/ ★ ★ ★ ★ ★

http://visionmedia.github.com/masteringnode/ ★ ★ ★

Tutorials - Videos

http://vimeo.com/pedroteixeira/videos ★ ★ ★ ★ ★

http://screenr.com/user/tjholowaychuk ★ ★

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serving a mp4 via node.js

2010-11-05T22:09:00.001+09:00

I'm practicing node.js. It's like early days of Rails. One thing that stops me to jump in this bandwagon is that my lack of knowledge of javascript. Anyway, after mastering node.js world technique, I want to go use event techniques in ruby in the future. I'm sure that ruby's virtual machine will evolve.

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Untitled

2010-09-27T12:32:00.001+09:00

Step1>

Step2>

Step3>

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Installing jspec, rspec textmate bundles

2010-09-21T17:45:00.001+09:00

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Installing jspec, rspec textmate bundles

2010-09-21T17:44:00.001+09:00

Install RVM textmate bundle http://rvm.beginrescueend.com/integration/textmate/cd /Library/Application\ Support/TextMate/Bundles/git clone git://github.com/rspec/rspec-tmbundle.git RSpec.tmbundleit clone git://github.com/visionmedia/jspec.tmbundle.gitosascript -e 'tell app "TextMate" to reload bundles'

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My first visit to IDC

2010-02-28T07:38:00.001+09:00

See and download the full gallery on posterous

These guys at IDC are really serious about security! I guess my XServe was the only OS X in the whole building

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TentCot

2010-02-28T07:07:00.001+09:00

I didn't want to use this. But project schedule is so tight.

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Cappuccino - animated segment controller

2009-10-17T07:04:00.010+09:00

I was trying to implement segmented controller with Cappuccino extension. I've succeeded to make CPTrackingController work. But it seem that LPKit is better than mine. It works with animation effect. The working example is uploaded at github. (http://github.com/jaigouk/Cappuccino_merb-visual-api_ui)

LPKit enabled Cappuccino toolbar from jaigouk on Vimeo.

Rest with Merb: CouchDB resources

2009-01-30T17:37:00.037+09:00

I've been studying couchdb. There are several ways to use couchDB with merb. CouchRest, dm-couchdb-adapter, relaxdb. At the beginning, I've focussed on dm-couchdb-adapter. Because there is a good example, the muddle. It works on my local machine too. I looked into the source codes, and it was not easy to understand them. My head was full of relational database concepts, and it prevented me to go further. I decided to spend more time on couchDB. I asked @merbist via twitter that which would be the proper way to use couchDB. And he answered that "Couchrest for sure, the 2 other ones don't use couch properly"

These are the resources to start.

There is a ruby interface written by jchris, Couchrest. He has a plan to launch Couchrest::Model seperately [link].

And Couchview has been replaced by couchapp [link](I've followed Peepcode screencast, and spent some time to figure out why "couchview" command is not working.)

$ couchapp
Usage: /opt/local/bin/couchapp [options] (push|generate)
-q, —quiet Omit extra debug info
-h, —help Display detailed help and exit
-v, —version Display version number

Here is what jchris said about couchapp at couchrest google group[link]
====================
Couchapp is equivalent to couchview, except for a few details about
how it expects to see documents stored on the filesystem.
If I recall correctly, couchview takes something like this
views/test-map.js
views/test-reduce.js
and pushes it to the views member of a design doc, which you'd specify
on the command line, with a default of falling back to a directory name. Couchview does that job just fine, but it is no generalized to handle the other functions that can be stored in a design doc.
the CouchApp script takes a filesystem and pushes it transparently to a design doc, so the on-disk layout it expects is a little different:
views/test/map.js
views/test/reduce.js
validate_doc_update.js
shows/post.js
lists/index.js
_attachments/images/example.png
_attachments/foo/bar.html
you are free to leave any of that out (so if you only care about views then you should be able to use it just fine.)
currently the python version of couchapp also has the ability to "clone" from a url. I'm working on getting the ruby version back up to speed, but for now you might be happiest installing the python version.

Things move so fast around couchDB and couchrest that one article is not proper to summarize them. I will post time to time about it.

merb pagination

2009-01-27T00:46:00.005+09:00

written by billturner #merb freenode irc channel.

Q. "@current_page = (params[:page] || 1).to_i " what does that refers to?
A. billturner> when you use the pagination, and the <%= paginate(..) %> stuff, it gives you links like /posts/index?page=2
A. billturner> so, if there's no "page=X" then it will pull the first page of results

502 Bad Gateway

2009-01-23T10:01:00.006+09:00

Recently, I've changed my server from mod-passenger to nginx because of the comment at merb google groups [link]. Passenger was fit for me. It makes deployment more easier than before. However, merb's way of handling processes seems complicated and advanced as Ezra said[link]. And it is not fully compatible with passenger now.

So I came back to nginx. I thought it would be easy. But it took some time to run my small app. I 've seen a lot of "502 Bad Gateway" page. I guessed that compiling was wrong at first time. It wasn't nginx but my logic in the codes. So the best way to check what's wrong, just type "merb" on the server. I haven't installed necessary gems and libraries. Yes, it is very basic stuff but easy to miss.

Twitter on Merb : Merb flat app Walkthrough

2009-01-16T13:02:00.059+09:00

Description

site : merb.kicks-ass.org
codes : jaigouk.github.com/twitter-on-merb
server: slicehost Ubuntu 8.1, nginx, merb version 1.0.8.1, dm version 0.9.10
purpose: aggreate github commits feeds and post them to twitter @edgemerb
todo: eager cache

Motivation

I’m a newbie in merb community. Since “the merger”, I needed correct and reliable reference and so was other newbies in the community. I started to translate merb-book in Korean. But it was not enough for us .I thought that learning merb would be easier if I build an app what I really need such as tracking recent changes. It was easy since there are good tutorials and tools. And scraping nightly version of README file could be helpful too. Because merb core team members are too busy to write guides and tutorials.

I laid aside scraping the README files for now. I just aggregated merb commits rss and send them to twitter. I use TwitterFox as twitter client on my desktop. Whenever a new message comes, It shows the message in a brief moment. It's really handy.

Generating a flat app

This is what I did at first time. As you see, It is really small and shows basic structure how merb works. If you want to learn more about internals of merb, visit here(http://github.com/michaelklishin/merb-internals-handbook)

Using Model in a flat app

I edited config/framework.rb file. Because I could not use twitter_search gem to verify the message is unique or not. This is same as twitter timeline api. It seems that they use cache. Therefore I had to add a model to check the message I'm sending is unique or not.

First, I added one line :model => Merb.root / "models" in config/frameworks.rb file. And then, wrote dependencies in init.rb file.

$merb-gen model tweet

$rake db:automigrate

Scraping with nokogiri

Since merb flat app has a single controller file, It was easy to start. But the twitter api and nokogiri took some time to use. I was not familiar with nokogiri, I googled and found this tutorial. (http://www.robertsosinski.com/2008/12/08/scraping-pages-made-easy-with-ruby-and-nokogiri/).
And I better use a well designed web site template. I picked one of the recommended templates from samshmagazine.(http://www.smashingmagazine.com/2008/12/01/100-free-high-quality-xhtmlcss-templates/)

There were 3 or 4 ruby libraries for twitter. And twitter4r has more documents than the others. It took much time to discover that timeline api and search api use cache. I just forgot about the cache. Anyway I installed necessary gems.

$sudo gem install twitter4r twitter nokogiri shorturl

And then I eddited index.html.erb file. In the controller, it only needs render method. I just wanted to use feedtools and feedupdater gem. But there were not enough document to reference and as merb-book says, I better not use codes that I don't understand. Scraping pages with nokogiri is easy but my app would be fragile.

I know the codes above is not that beautiful. But I hope this code help another rubist who want a scraping example through nokogiri. As you see above, k.content which was return by nokogiri's search method was Hash. This is why i used to_s method.

Scheduling background works

And posting a message to twitter was tricky for me. Because of increasing popularity of twitter, posting throuth api was too fast for twitter sometimes. Posting messages takes much time and that code block needs to sleep. In the initial codes, I wrapped the block with run_later. But I found that I need to schedule the tasks. There would be several way to acheive scheduling the daemons. In version 0.0.1.4(Twitter-on-Merb), I used crontab and rake. But the codes were dirty and it did not work as I expected. I talked about this with lakteck via tiwtter, and I remembered that I've seen rufus-scheduler at igvita.com[link]. It was really easy to implement scheduler with rufus-scheduler gem. The scheduler scrapes web sites on every 10 minutes. And I made a starling consumer daemon. I referenced "Advanced Rails Recipes #42"

rufus-scheduler github repo [link]
rufus-scheduler rdoc [link]
starling github repo [link]

confing/init.rb

lib/daemons/starling_consumer.rb file

lib/daemons/starling_consumer_ctl.rb file

config/consumer.god file. Daemons are started after "cap:deploy".

Cache

My flat app was too slow, and it was time to implement cache. I referenced,

Keep a hot cache with merb-cache by Ben Burkert at MerbCamp
Merbunity Tutorial#15 written by Ben Burkert on Sep 07, 2008
Merb-cache's methods written by Guillaume Maury(a.k.a giom) on Dec 19, 2008

Here's quick introduction [original gist document link]

== Quick intro
With fragment caching, you can mix dynamic and static content.

With action caching, the whole template is cached
but the before filters are still processed.

With page caching, the whole template is put in html files in a special
directory in order to be handled directly without triggering Merb.

by Dan Kubb on July 22, 2008

But my init file was wrong at that time and throws erros whenever I run "rake db:automigrate" since I set up the cache(http://gist.github.com/44702). I really didn't know how to fix this. At first, I guessed that datamapper version could be the reason why causes it. After updating the gems, error were still there. Fortunately I have known Guillaume Maury(giom) recently via twitter. He helped to get out of this. This code was not familiar with me. I thought I knew the way to setup the cache.
The codes were already in his article (http://gom-jabbar.org/articles/2008/12/14/example-nginx-configuration-for-merb-with-page-caching-using-the-file-store). I run my apps on passenger so I simply skipped it. :) I highly recommend his blog if you are in Merb2 or Rails3. Here is the snippet written by him. (The initial flat app with plain dependency line did not work.)

And I referenced here.
http://blog.evanweaver.com/files/doc/fauna/memcached/files/README.html

$ wget http://download.tangent.org/libmemcached-0.25.tar.gz
$ tar -xzvf libmemcached-0.25.tar.gz
$ cd libmemcached-0.25.tar.gz
$ ./configure
$ make && sudo make install
$ sudo gem install memcached
$ irb
> require 'rubygems'
> require 'memcached'

Deploy

$cap deploy:setup
$scp -r database.yml to server
$scp -r twitter.yml to server

$rake db:create
$rake db:automigrate
$cap deploy

this is my deploy.rb file.

tip

And if you have problems after your deployment, check if config.ru(must be 'config.ru', not 'Config.ru') file exists and the permissions are correct(chmod 755 -R).

Free merb screen casts

2009-01-02T15:20:00.009+09:00

#1 MerbCamp - Yes, all merbists have seen it.
#2 Merbunity - It's maintained by hassox!
#3 Atlanta ruby user - I found this site recently. I think it's worth to see.
#4 Merb Dependencies and Bundler - by Carl Lerche
#5 peepcode (well, not free. but it's 9$) - The screencast was recorded on merb 0.9 but it still is a good one.

And there are good tutorials.

Merb + Rails merger

2008-12-24T08:34:00.033+09:00

Update(2009.2.8)
"Merb in Action" => "Rails3 in Action"
http://www.manning.com/katz/

Table of Contents
1. Building Your First Rails 3.0 Application
2. Overview of the Rails stack(s) + architecture
3. Creating Rails Applications
4. Using DataMapper for Models
5. Using ActiveRecord for Models
6. Other Choices for Models
7. Processing Requests
8. Routing in Rails 3
9. Customizing Views
10. Working on the Client Side
11. Supporting Characters
12. Using the Plugin API
13. Testing Your Applications
14. Deploying a Rails Application
15. Scaling Rails

Appendix A Just enough advanced Ruby
Appendix B The migration story
Appendix C Rails 2 to Rails 3
Appendix D Merb 1 to Rails 3

Update(2009.2.5)
Rails 3 will have mountable applications, not engines or slices.

Update(2009.1.16)
I just got an email from manning about "Merb in Action".
Rails becomes more modular, by building on rails-core with the ability to opt in or out of specific components and making it possible to replace parts of Rails without disturbing other parts.
Merb performance improvements flow into Rails, including benchmarking applications so developers can see which optimizations have real-world impact.
A defined public API with a test suite, so users and plugin developers have a stable API to build against.
A "core" version of Rails, like Merb's current core generator, that makes it easy to select just the parts that are important for your app.
DataMapper and Sequel support as first-class ORMs, along with ActiveRecord as the default.
Rack support in Rails 3, to improve the state of modular, sharable logic between applications.
Update(2008/12/26)
So far, it seems that merb google group is the best source. And Matt Aimonetti answers all the concerns.

Yehuda Katz says
"If you want to learn Merb for modularity and power that is not currently present in Rails, stick with Merb. We'll provide a good upgrade path to Rails3 (and feel free to contact me personally to keep me honest on that promise), and you'll have a leg-up when the same power makes its way into Rails. While Rails3 will still be very similar to Rails2 for current Rails users, it will look a lot like Merb for those users who are currently drawn to Merb."

"We always said that there would be breaking changes in Merb 2.0. Now, some of those breaking changes will be in tandem with the Rails3 merger. However, we will treat them like any other breaking changes, and make sure the deprecation notices flow freely and the transition path is clean. Make sense?"

Matt Aimonetti says,
"The great advantage of using merb now, is that it has a public API so we will be able to easily migrate it to the new 3.0 API. Concretely, we are planning on being able to replace merb-core by rails-core in your merb app and to use merb-helpers and other plugins with rails-core."

I think "Merb in Action" would take longer than expected. And it's required to rewrite the whole chapters that are published. Of course, book's title will not be changed but I'm just worried about Merb. It would be called Rails3.0 by many other people, especially inside Rails community.

As Ezra said,

Merb is dead, long live Merb(Rails-3.0)!

Matt Aimonetti said,

I don't think Ezra is right. Merb isn't dead. First off, merb will still be around until the next release (rails 3.0) and we will keep on supporting it even after that (maintenance).

So many merbists are disappointed by this news but there is nothing can be done. Engin Yard's decision looks solid. I've accepted it, after all. I've read many articles enough to say that I will stick with Merb. There were some people who even want to switch to Django. I decided to practice Merb more than before. Because Merb would be the core changes in Rails3. And it could happen that Merb core team is too busy. But evangelist like Matt Aimonetti will help us. I hope taking this path would be natural to Merb2.

오픈소스 merb-book 한국어 번역

2008-12-20T01:53:00.023+09:00

Now, merb has many resources to learn.

튜토리얼 및 기타 소개 동영상들 : MerbCamp videos,
스크린캐스트 : http://merbunity.com/screencasts

and there is open source merb-book which is started by Matt Aimonetti.
Well, I saw Chinese and Japanese but no Korean one. I think that there are probably not enough rubists in Korea. Anyway I sent a message to him that I want to start if there is no one. And here it is.

Update(12/22/2008)
I've completed "Merb-More" Chapter. But there are still unfinished chapters in English.
Merb-More 챕터까지 모두 한국어로 번역을 완료했지만, 영어로 된 원본이 아직 빈 곳이 많습니다. 번역하는데에는 네이버 단어장, 구글번역기, 바벨피쉬, 그리고 제 경험을 최대한 살려서 번역했습니다. 많이 부족하므로 오타나 잘못된 번역을 알려주시면 고치도록 하겠습니다. 한글로 된 merb 책이 나오려면 아직 오래 걸릴 것 같습니다. (영어 책도 아직 출판되지 않았습니다.) 참여를 원하시는 분은 메일 보내주시기 바랍니닷.

Update(12/23/2008)
I finished the translation.
현재까지 작성된 영어 원본에 대한 번역은 마쳤습니다. 제 생각에는 본격적으로 책들이 쏟아지는 2009년 전반에는 이 오픈소스 책도 많은 개선이 있을 것 같습니다.

Update(12/24/2008)
Rails와 Merb가 합쳐지는 이 시점에서, Pragmatic Bookshelf, Apress 등에서 나온 책들은 의미가 희석되었다고 생각합니다. 워낙 빠르게 변하다보니 책들이 따라가지 못하고 있습니다. 오픈소스 책의 발안자인 Matt Aimonetti가 Rails 코어팀에 합류했기 때문에 이 책이 그나마 현재 나온 책중에서는 가장 참고할만한 책이 되지 않을까 싶습니다. Rails3.0에선 Merb의 기능들을 흡수할 예정이기 때문입니다.

update(2009.1.4)
제가 실수로 master 브렌치에 작업내용을 합치질 않았었습니다. -_-;;;
이제 github에서 다운받으셔서 정상적으로 보실 수 있습니다. 업데이트 내용은 4번째 장인 "데이터베이스와 상호작용" 부분입니다. 현재까지 작업된 영어원본까지 모두 작업완료되었습니다. 책을 받아서 보시는 분들이 계시다면, 오타나 의역에 무리가 있는 부분을 지적해주세요. :)

오픈소스 merb 책이 나왔지만 한국어 번역이 없어 매트에게 해보겠다고 메세지를 보냈습니다. 흔쾌히 해보라해서 현재 작업중이고 getting started/mvc까지 작업완료했습니다. 이제와서 보니 일본어나 프랑스, 중국 번역판에 비해 늦은 것은 아니었습니다.

------------------------------
책을 보는 방법
------------------------------

필요조건 :
a. ruby, gem
b. git

스텝 :

1. 먼저 제 github 저장소에서 merb-book을 로컬 pc로 복사합니다.
$git clone git@github.com:jaigouk/merb-book.git

2. 다운받은 merb-book 루트 디렉토리에서 다음을 실행해 주시면 됩니다.
$./bin/merb

3. 브라우저에서 http://localhost:4000 주소로 가면 책을 보실 수 있습니다. 목차 맨위에 보시면 각 언어들 링크가 있는데 한국어를 선택하시면 됩니다.

----------------------------------
Chapter별 완성도(2009/1/4): 좋음(○), 미흡(△), 없음(X)
----------------------------------

부록

garage sale like notes

2008-12-17T20:21:00.003+09:00

iPhone, and desktop notes are hard to see them all in a big picture as Roam said.

3D desktop and ruby

2008-12-17T18:54:00.009+09:00

As the rumor says, it is obvious that Apple is developing next OSX. 3D environment is the critical difference. Bumptop desktop could be similar with it. Trends are really clear. Wiimote, Jeff Han's Ted demo, and Ubuntu Compiz fusion. The new era of HCI has come. But there're little apps which are appropriate with these environments. Adobe launched AIR, and it is still early for general users. But it is certain that adoptions are growing.

Now, we see java 3d OS. Where is shining, rich ruby desktop environment! Do we need to learn Air to mimic 3d actions?

morganstanley - Presentation from Web 2.0 Summit

2008-12-09T19:16:00.001+09:00

Mary Meeker Web 2.0 Presentation

View SlideShare presentation or Upload your own. (tags: trends web)

Motorola hired 350 people for Android.

Paul Hughes: Design Thinking's photostream

2008-12-05T12:23:00.000+09:00

look, see, imagine

2008-12-03T20:43:00.007+09:00

Recently I've read "The Back of the Napkin". And Here is what I'm thinking.
I think it is really hard to see the big picture in these days. There are just too many informations to catch up.

We're gathering informations by emails, RSS, twitter, conversations and so on. But have you really gone through all the star-marked articles? Well, I haven't.

And there are web apps that makes me do extra things. Some apps look promising to me except I don't have a mac.

After reading Alan Greenspun's "The Age of Turbulence", I'm sure that the global economy's speed is really fast like light. It's out of control in this hot, flat, crowded world even for FRB.

How can we catch up all these informations? May be, no one can. But they only pay their attentions on something meaningful to them. As Eric Schmidt says, most of us focus on the head, not the tail. Why? Because there is so little time to spend on reading, studying, and even eating. Most of people do what they have been doing. But there are specific needs. And they start to google it or to digg it. They already have established their information sources. It could be friends, social networking sites, ranking sites, or a RSS reader. Here it comes, "Look, see, imagine".

I don't have enough room to post every data that I've gathered. And it would consume a lot of ink and papers. Why there is no software that help me to see the big picture?

Comment on Google CEO Interview

2008-11-20T13:37:00.001+09:00

1. 지금 구글은 안드로이드와 기존의 플랫폼을 연계, GPS를 활용한 광고 등을 사용하여 기기 자체는 거의 공짜로 공급하는 것을 생각중

2. 롱테일 관점에서 80%를 차지하는 부분이 더 가속화. 브랜드가 강화될 것. 물론 테일 부분도 놓치면 안됨

3. 애플의 모바일미는 시기상조였음. 서비스 자체가 단조롭고 진짜로 도움이 되질 않음. 별반 다를게 없었던 것

4. 먼저 웹상에서 탄탄한 기반을 가지고 나서야 모바일 서비스의 의미가 있을 것임.

5. RFID, GPS, Sensor network 등이 갖춰졌을때 에릭슈미트가 이야기하는 서비스들이 나올 것. 그 전까지는 현재의 스마트폰이나 아이팟처럼 컨텐츠를 데스크탑에서 다운받아서 싱크하는 형태로 2-3년간 지속될 가능성이 큼.

6. 애플의 플랫폼이냐 구글의 플랫폼이냐는 좀 더 두고봐야 하겠지만 서비스가 웹상에서 먼저 정착이 되야 하므로 기다리면서 관망하는 것도 가능. (구글이 블로거를 인수하긴 했지만 블로깅에서는 워드프레스가 우위 )

7. 애플 아이폰이 선전하고 있으나 전체 마켓쉐어는 아직 멀었음.

8. 애플은 아이튠즈를 통한 어플리케이션 시장을 벌써 형성했음. 이에 반해 구글은 이제 막 안드로이드를 정착시켜나가야 하는 형태. 만약 구글이 노키아나 삼성, 모토롤라를 아우르는 협력을 끌어내어 안드로이드를 장착시킨다면 이야기가 달라짐.

9. 위의 경우는 쉽지 않을 것. 각 업체들이 원하는 바를 통합시키는 것에 대한 시간이 걸릴 것. 그런면에서 애플이 타이밍이나 속도면에서 우위임.

me.com simple UI

2008-08-22T13:40:00.001+09:00

Well, on my ubuntu 8.04 file attachment was not working properly. It seems that the UI is so simple that it even makes me feels paying for this app is expensive.

Rails 2.1 OSX Finder like ColumnNav.

2008-08-22T07:47:00.013+09:00

original google code : http://columnav.googlecode.com/svn/trunk/index.html

Update(22/8/2008):
Since ResponseHeader was "applicatoin/json ;utf8 ",
The original code does not work.

in columnav.js,
Before:
var contentType = o.getResponseHeader['Content-Type'];
if ('application/json' == contentType.replace(/\s+$/,'')) {

After:
var contentType = o.getResponseHeader['Content-Type'];
var compareString = contentType.replace(/\s+$/,'')
if (compareString.include('application/json')) {

It was not easy to implement "finder" with extjs. And furthermore, my codes were getting ugly. Almost hard to see. So I abandoned Extjs on the user-view. I've decided to use it on admin pages.

ColumNav is a hierarchical menu implementation utilizing Bill Scott's Yahoo UI Carousel component. Content is loaded from an unordered list and displayed in a scrollable viewport, similar to Column View in the Mac OS X Finder.

Features include:

infinite extensibility using Ajax to build sub-menus
instantiation from DOM or JSON data sources
a highly customizable look and feel using CSS
support for multiple columns
support for keyboard-only navigation (CTRL + arrow keys)
cross-browser compatibility

App/views/Categories/index.html

<% content_for :head do%>

<%= stylesheet_link_tag 'cssbits_notice' %>
<%= stylesheet_link_tag 'columnav', 'columnav_apply' %>
<%= javascript_include_tag :defaults %>
<%= javascript_include_tag "columnav/yui/yahoo-min" %>
<%= javascript_include_tag "columnav/yui/utilities" %>
<%= javascript_include_tag "columnav/yui/container_core-min" %>

<%= javascript_include_tag "columnav/carousel_min" %>
<%= javascript_include_tag "columnav/columnav" %>
<%= javascript_include_tag "columnav/columnav_json_parsing" %>

<% javascript_tag do %>
try { document.execCommand('BackgroundImageCache', false, true); } catch(e) {}

function init() {
var cn_cfg = {
numVisible: 3,
prevElement: 'columnav-prev',
datasource: '/categories/columntree/1.json'
};
var cn = new YAHOO.extension.ColumNav('columnav', cn_cfg);
}
YAHOO.util.Event.addListener(window, 'load', init);
<% end %>

<% end %>

< back

App/controllers/Categories_controller.rb



def columntree(id = params[:id])
 categories = Category.find_all_by_parent_id(id)

 data = get_tree(categories, id)
 respond_to do |format|
   format.json { render :text => data[0].to_json, :layout => false  }
 end 
end  

                        
def get_tree(categories, parent_id) 
   parent = Category.find_by_id(parent_id)
   data = Array.new
   data.concat([ "ul" => insert(categories, parent) ])
  return data 
end

def insert(categories, parent)
 result = Array.new
 result.concat(["li" => insert_data(categories, parent) ])
return result[0]
end

def insert_data(categories, parent)
 iterated = Array.new
categories.each { |category|
    if !category.leaf?   
    iterated.concat(["a" => {"#text" => category.text, "@href" => "/categories/columntree/"+category.id.to_s+".json", "@rel" => "ajax"}, "id" => category.id]) # "@rel" => "ajax" 면 폴더로 인식.
    else 
      iterated.concat(["a" => {"#text" => category.text, "@href" => "http://peepcode.com"}, "id" => category.id])  
    end 
  }
return iterated
end

app/models/category.rb


class Category < dependent =""> :nullify
 has_many :portfolios, :dependent => :nullify

 acts_as_nested_set

 validates_presence_of :text

has_attached_file :photo,
 :styles => { :medium => "220x180#", :thumb => "100x82#" },
 :path => "#{RAILS_ROOT}/public/images/category_photos/:id/:style_:basename.:extension",
 :url => "/images/category_photos/:id/:style_:basename.:extension",
 :default_url => "/images/category_photos/missing.png",
 :whiny_thumbnails => true


#liquid
liquid_methods :text

# extjs를 위한 코드임

 def self.root_nodes
   find(:all, :conditions => 'parent_id IS NULL')
 end

 def self.find_children(start_id = nil)
   start_id.to_i == 0 ? root_nodes : find(start_id).direct_children
 end
 
 def children
   Category.find_all_by_parent_id(self.id)
 end

 def self.find_level1
  find_all_by_parent_id(1)
 end
    
  def leaf
   unknown? || children_count == 0
 end

 def leaf?
    unknown? || children_count == 0
 end


 def to_json_with_leaf(options = {})
   self.to_json_without_leaf(options.merge(:methods => :leaf))
 end
 alias_method_chain :to_json, :leaf
 private
end

business-model-innovation-matter

2008-08-19T20:00:00.001+09:00

Business Model Innovation Matters

View SlideShare presentation or Upload your own. (tags: osterwalder alex)

SproutCore !!

2008-08-14T20:18:00.003+09:00

For about 2 weeks, I studied and struggled to use extjs on my recent project.
As time goes, It became a mess. Because of javascript codes that are not organized well. For example, I wanted to make a browser like Finder which is default file browser on OSX. I had to find some way embed erb code in javascript(I used extscaffold plugin and I personally added some codes) By using extjs It was so hard that I almost thought it is time to move on. And I clicked on Sprout and dug into it while searching for snippets on google search results. I barely knew about beauty of it by the time I saw the test screen. You better see it by yourself. It's really awesome.

But one thing that bothers me is that it still does not support IE6, and IE7. I think it would take 3 or 4 months to be stable. And there will be "Merb in Action". It would be great to use Sproutcore with Merb. :)

interesting ted.com video.

2008-08-07T06:29:00.003+09:00

404 fetching http://gems.datamapper.org/yaml

2008-07-22T14:23:00.001+09:00


$ sudo gem sources -r http://gems.datamapper.org
Bulk updating Gem source index for: http://gems.rubyforge.org/
ERROR:  While executing gem ... (Gem::RemoteSourceException)
HTTP Response 404 fetching http://gems.datamapper.org/yaml

$ sudo nano ~/.gemrc

Capistrano, git, rails again.

2008-07-22T07:10:00.002+09:00

set :use_sudo, false
# ====================================================
# CUSTOM OPTIONS
# ====================================================
set :user, "deploy"
set :runner, user
set :application, "go.go.com"
set :domain, "xx.xx.xx.xx."

role :app, application
role :web, application
role :db, application, :primary => true

# ====================================================
# DATABASE OPTIONS
# ====================================================
set :rails_env, "production"

# ====================================================
# DEPLOY TO
# ====================================================
set :deploy_to, "/home/#{user}/public/#{application}"

# ====================================================
# REPOSITORY
# ====================================================
set :scm, :git
set :deploy_via, :remote_cache
set :repository, "ssh://deploy@xx.xx.xx.xx:xxxx/var/git/ext_kocm.git"
set :repository_cache, "git_cache"

# ====================================================
# REPOSITORY
# ====================================================
set :ssh_options, { :forward_agent => true }
default_run_options[:pty] = true
set :port, 30003 #ssh port

# ====================================================
# Tasks
# ====================================================
namespace :deploy do
desc "Restarting mod_rails with restart.txt"
task :restart, :roles => :app, :except => {:no_release => true} do
run "touch ${current_path}/tmp/restart.txt"
end

[:start, :stop].each do |t|
desc "#{t} task is a no-op with modrails"
task t, :roles => :app do; end
end
end

Ubuntu Hardy Intel graphics dual monitor on LG XNote LW25

2008-07-08T00:44:00.004+09:00

1. xorg.conf

http://www.thinkwiki.org/wiki/Installing_Ubuntu_6.06.1_on_a_ThinkPad_R60e#Intel_945GM_with_the_xorg_Intel_driver

2.

$  xrandr -q 
$ xrandr  --output LVDS --auto
$  xrandr --output LVDS --mode 1024x768 --output VGA --off 
  $ xrandr --output VGA --right-of LVDS --mode 1024x768

3.
compiz-switch howto
sudo apt-get install fusion-icon

You can run Fusion-icon immediately by opening the Run Applications dialog with Alt-F2 and typing fusion-icon. Note that this will cause Compiz to restart.

To start Fusion-icon whenever you log in, add it to the Startup Programs list in System->Preferences->Sessions.

I haven’t found a package for Ubuntu 7.10, but those who are waiting until the final 8.04 release to upgrade can also use the similar Compiz-Switch application instead.

[update] emiligene has posted a Ubuntu 7.10 repository for Fusion-icon in the comments:
deb http://ppa.launchpad.net/maco.m/ubuntu gutsy main restricted universe multiverse
Thanks!

[update] An anonymous commenter has pointed out that running fusion-icon -n will prevent the application from unnecessarily restarting Compiz when it starts. You should use this command instead.

scrubyt on rails EOFERROR

2008-02-08T03:36:00.000+09:00

I'm using scrubyt on rails2.0.2 and development / running evironment is cygwin.

Problem :

Everytime I run my extractor which is located lib and included in controller,

it runs properly just once. From second time, I saw EOFError and

I've searched scrubyt forum. and included this file in lib.

----------------------------

usr/lib/ruby/1.8/net/protocol.rb:133:in `sysread'
/usr/lib/ruby/1.8/net/protocol.rb:133:in `rbuf_fill'
/usr/lib/ruby/1.8/timeout.rb:56:in `timeout'
/usr/lib/ruby/1.8/timeout.rb:76:in `timeout'
/usr/lib/ruby/gems/1.8/gems/http_configuration-1.0.2/lib/http_configuration.rb:23:in `timeout'

----------------------------

Why :

I've googled about this problem enough. The problem is not on rails, nor on ruby. It's mechanize.

Here is the explanation about the bug.

Solve :

C:\cygwin\lib\ruby\gems\1.8\gems\scrubyt-0.3.4\lib\scrubyt\core\navigation\fetch_action.rb

I've added just one line to the fetch_action.rb

module FetchAction

@@current_doc_url = nil

@@current_doc_protocol = nil

@@base_dir = nil

@@host_name = nil

@@agent = WWW::Mechanize.new

@@history = []

@@agent.keep_alive = false

My gem list

2008-02-07T16:16:00.001+09:00

I'm developing rails app on cygwin environment. And these are the list of my gems. mongrel and thin are really run differently. It seems monrel consumes more memory. So I poked thin server. The result was slightly dissapoint, because thin server was not stable and was not capable of handling large size file uploading. Anyway it's a dilema.

update -- thin0.6.2 is ok with my app now. It's really fast and stable.

abstract (1.0.0)
actionmailer (2.0.2)
actionpack (2.0.2)
activerecord (2.0.2)
activeresource (2.0.2)
activesupport (2.0.2)
acts_as_ferret (0.4.3)
archive-tar-minitar (0.5.1)
archive-tarsimple (1.1.1)
aws-s3 (0.4.0)
beanstalk-client (0.6.1)
builder (2.1.2)
capistrano (2.1.0)
capserverext (0.0.5)
cgi_multipart_eof_fix (2.5.0)
coderay (0.7.4.215)
color (1.4.0)
daemons (1.0.9)
deprec (1.9.2)
erubis (2.5.0)
eventmachine (0.10.0)
fastercsv (1.2.3)
fastthread (1.0.1)
ferret (0.11.6)
flickraw (0.4.4)
flvtool2 (1.0.6)
gchart (0.4.2, 0.4.1)
gem_plugin (0.2.3)
gemsonrails (0.7.1)
geoip_city (0.1.2)
gettext (1.10.0)
googletranslate (0.2)
highline (1.4.0)
hobo (0.7.2)
hoe (1.5.0, 1.4.0)
hpricot (0.6)
json_pure (1.1.2)
mailfactory (1.2.3)
mechanize (0.7.0)
merb (0.5.3)
mime-types (1.15)
mini_magick (1.2.3)
mocha (0.5.6)
mongrel (1.1.3)
mongrel_cluster (1.0.5)
mongrel_send_file (0.1)
needle (1.3.0)
net-sftp (1.1.0)
net-ssh (1.1.2)
oauth (0.2.0)
ParseTree (2.1.1, 1.7.1)
ParseTreeReloaded (0.0.1)
pdf-writer (1.1.7)
piston (1.3.3)
rack (0.2.0)
radiant (0.6.4)
rails (2.0.2)
railsmachine (1.0.0)
rake (0.8.1)
RedCloth (3.0.4)
reliable-msg (1.1.0)
rfacebook (0.9.8)
right_aws (1.4.3)
right_http_connection (1.2.0)
rme2day (1.0.2)
rubigen (1.1.1)
ruby-debug (0.10.0)
ruby-debug-base (0.10.0)
ruby-hmac (0.3.1)
ruby-openid (2.0.3)
ruby-prof (0.5.2)
ruby-yadis (0.3.4)
ruby2ruby (1.1.8, 1.1.6)
rubyforge (0.4.4)
rubygems-update (1.0.1)
RubyInline (3.6.3)
RubyInlineAcceleration (0.0.1)
rubyzip (0.9.1)
ruport (1.4.0)
ruport-util (0.12.0)
rvideo (0.9.3)
scrapi (1.2.0)
scrubyt (0.3.4)
simple-daemon (0.1.2)
slave (1.2.1)
sources (0.0.1)
springnote_resources (0.5)
sqlite3-ruby (1.2.1)
superredcloth (1.160)
syntax (1.0.0)
termios (0.9.4)
thin (0.6.1)
tidy (1.1.2)
transaction-simple (1.4.0)
tzinfo (0.3.6)
uuid (1.0.4)
xml-simple (1.0.11)

backgroudrb small tip.

2008-02-01T06:15:00.000+09:00

gerate worker thread (Boo is capitalized)

$ script/generate worker Boo

http://jacqueschirag.wordpress.com/2007/09/12/setting-up-backgrounddrb/

geoip_city

2008-01-27T03:55:00.000+09:00

tested on cygwin. runs smoothly..

original article :http://blog.hungrymachine.com/2007/10/31/super-fast-ip-to-lat-lng-in-rails-part-2

wget http://www.maxmind.com/download/geoip/api/c/GeoIP.tar.gz tar -zxvf GeoIP.tar.gz cd GeoIP ./configure && make && sudo make install  wget http://rubyforge.org/frs/download.php/27077/geoip_city-0.1.gem sudo gem install geoip_city-0.1.gem wget http://www.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz gunzip GeoLiteCity.dat.gz sudo mkdir /usr/local/share/GeoIP sudo mv GeoLiteCity.dat /usr/local/share/GeoIP/GeoLiteCity.dat

Then the ruby part:

>> require 'geoip_city' >> g = GeoIPCity::Database.new('/usr/local/share/GeoIP/GeoLiteCity.dat') >> res = g.look_up('4.2.2.2') >> puts "lat: #{res[:latitude]} lng: #{res[:longitude]}" lat: 38.0 lng: -97.0

cygwin, Rails2, OpenID 2

2008-01-25T23:06:00.000+09:00

Hi, I've been googling about a week to solve a ruby-openid problem. And found a working example on Rama McIntosh's blog. http://myutil.com/2007/12/29/openid-2-0-2-with-rails-2-0-2

At first, I thought rails Ticket #10604 patch worked. But it was more complicated than that. Since Rails, ruby-openid, and open_id_authentication plugin versions were not consistent. And Rama McIntosh went through all. You can find Dr. Nick’s example application fully ported to rails 2.0.2.

Here is my development environment.

------------------------------------------------------------

LG LW25 advanced laptop IntelCore2 T5600, Mem 2G

XP Pro version2002 SP2

Cygwin + CygPutty

Ruby ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-cygwin]

Rails 2.0.2

ruby-openid (2.0.3)

rake (0.8.1)

mongrel (1.1.3)

mongrel_cluster (1.0.5)

ruby-yadis (0.3.4)

app db : sqlite3

------------------------------------------------------------

Besides his README, some extra typing was needed to run the app.

1. svn co http://drnicwilliams.com/svn/openid/demos/apps/openidauth_multiopenid/trunk openidauth_multiopenid

2. Do not erase some svn directories because he made some rake tasks related with svn.

3. rake freeze TWICE!

4. mkdir log

5. require_gem => gem

openidauth_multiopenid/vendor/gems/ruby-openid-1.1.4/lib/openid/service.rb:7

openidauth_multiopenid/vendor/gems/ruby-openid-1.1.4/lib/openid/discovery.rb:8:

6 rake db:create

7. gem install mocha

8. rake test

9. config/environment.rb

config.action_controller.session = { :session_key => "_openidauth_multiopenid_session", :secret => "mocramagic" }

Replace to other {key, secret} like this,

config.action_controller.session = {

:session_key => '_foo_session',

:secret => '4747ba80asdfqwertwertwee5y4365345ertf gadrtvrwebterwvd653b65tyt93c45cb53242eb43'

}

10. mongrel_rails start!!

IT WORKS!!!

2008-01-23T00:46:00.001+09:00

How I deployed to my slice.

1. Peepcode tutorials

capistrano and git screencast helped me.

2.Scott Chacon's tutorial screencast.

He really help me out. Any one who's struggling with capistrano & git, I higly recommand his tutorial. I was able to deploy my app via Cygwin.

IT'S PRODUCTION MODE!!

2008-01-23T00:34:00.000+09:00

1. In environment.rb, uncomment

RAILS_GEM_VERSION = '2.0.2' unless defined? RAILS_GEM_VERSION

2. deploy.rb

set :mongrel_servers, 3

set :mongrel_port, xxxx

set :rails_env, 'production'

3. /u/apps/appname/current/config/mongrel_cluster.rb

---

user: deploy

group: deploy

log_file: log/mongrel.log

cwd: /u/apps/appname/current

port: xxxx

environment: production

pid_file: tmp/pids/mongrel.pid

address: 127.0.0.1

servers: 3

4. cap deploy:migrate RAILS_ENV=production

grep mongrel pid

2008-01-22T21:08:00.000+09:00

ps -ef | grep mongrel

kill -9 xxx

ps aux | grep [m]ongrel

ps aux | grep [m]ongrel | awk '{ print $2 }' | xargs kill -9

ActiveRecord::StatementInvalid (Could not find table '

2008-01-21T17:50:00.000+09:00

ActiveRecord::Base.allow_concurrency = true

http://blog.defv.be/2006/9/21/activerecord-ruby-and-threads

http://blog.ardes.com/archives/2006/12

It's just amazing that the bug is still there...

cygwin ssh.

2008-01-18T09:18:00.000+09:00

If you're using capistrano or webistrano and developing on cygwin environment, you better set server's ssh port to 22. Capistrano does not change it's port number when cap deploy:cold. I googled this problem for 3 days. And this is what I got so far.

edit .git/hooks/pre-commit and comment out the following lines:

if (/\s$/) {

bad_line("trailing whitespace", $_);

}

below article was written by stevie, at capistrano : google groups.

----------------------------------------------------------------

A better Cygwin package manager:

1. run setup.exe again, but this time use the GUI and install only

wget (if you're installing Cygwin on a bunch of machines, it would

probably be easier to install wget on one machine and then copy over

then necessary files for wget on the others so you're not having to

fire up the GUI on each machine)

2. get Stephen Jungels' apt-cyg and copy it into /bin: wget

http://stephenjungels.com/jungels.net/projects/apt-cyg/apt-cyg

3. Now you can install any cygwin package with a "apt-cyg install

". *MUCH* easier than using that horrible GUI.

----------------------------------------------------------------------------------

one cent tips

---------------------------------------------------------------------------------

1. Can't see the welcome page?

sudo chown -R www-data:www-data /var/www/rails/learnkorean.kr/current

2. If you cannot deploy production mode, try this

%> RAILS_ENV=production rake db:migrate

%> set RAILS_ENV=production

%> rake db:migrate

Gusty, Nginx, Rails and Mongrel_cluster howto

2008-01-16T08:46:00.000+09:00

Here are the articles where I learned proper way to do this.

sudo cp /usr/lib/ruby/gems/1.8/gems/mongrel_cluster-1.0.5/resources/mongrel_cluster /etc/init.d/mongrel_cluster

Next, add a path statement to mongrel_cluster file just above the CONF_DIR variable:
sudo vi /etc/init.d/mongrel_cluster

PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local:/usr/local/sbin:/usr/local/bin
USER=mongrel to USER=www-data

sudo chmod +x /etc/init.d/mongrel_cluster
sudo update-rc.d mongrel_cluster defaults

In our rails app directory we need to create our mongrel config and then symlink it to where our mongrel config directory located at /etc/mongrel_cluster.

nano config/mongrel_cluster.yml

cwd: /var/www/rails/coredrill
log_file: log/mongrel.log
port: 8000
environment: production
group: www-data
user: mongrel
address: 127.0.0.1
pid_file: tmp/pids/mongrel.pid
servers: 3

ln -s /var/www/rails/coredrill/config/mongrel_cluster.yaml /etc/mongrel_cluster/coredrill.yaml

Starting nginx: 2008/01/15 23:17:19 [warn] 3238#0: conflicting server
name "coredrill.wowdns.com" on 37.208.125.80:80, ignored
==>
You have to add this to your default vhost:

server_name _ *;
listen 8080 default;

Finally, check your vhost config.
server

{

listen 37.208.125.80:80; => listen 8080;
...

}

sudo ln -s /etc/nginx/sites-available/default /etc/nginx/sites-enabled/default

mongrel_rails start -d -e production -p 8000 -P log/mongrel8000.pid
mongrel_rails start -d -e production -p 8001 -P log/mongrel8001.pid
mongrel_rails cluster::start
mongrel_cluster_ctl status

another logo

2008-01-15T16:28:00.001+09:00

Core Drill

2008-01-15T16:19:00.001+09:00

Well, I'm developing a site with my friend. My rails stack is on Xen(slicehost).

Ubuntu 7.1.0 Gusty
NGINX
Mogrel_cluster
Capistrano
Rails2.0.2

one cent tip.

2008-01-10T07:06:00.000+09:00

Fount this from google groups

http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/e0fcc4720ee59ba8/5bd3f77e610925b3%235bd3f77e610925b3

I installed mini magick correctly and
thumbnails are still not generated.

You need to have a 'parent_id' column in your photos table. This one
had me scratching my head for a few hours too until I stumbled across
this requirement of the plugin.

attachment_fu on Windows

2008-01-10T04:51:00.000+09:00

http://railsforum.com/viewtopic.php?id=6307

Code : - fold - unfold

      def uploaded_data=(file_data)
        return nil if file_data.nil? || file_data.size == 0
        self.size = file_data.size
        self.content_type = file_data.content_type
        self.filename     = file_data.original_filename if respond_to?(:filename)
        if file_data.is_a?(StringIO)
          file_data.rewind
          self.temp_data = file_data.read
        else
          self.temp_path = file_data.path
        end
      end

and added conditionals for the size

Code : - fold - unfold

      def set_size_from_temp_path
          self.size = File.size(temp_path) if save_attachment? && (self.size == 0 || self.size.nil?)
      end

Posted by Adam (Guest) 
on 10.04.2007 01:34
http://www.ruby-forum.com/topic/99870
To get things working with S3 and windows, I changed:        def temp_data         if save_attachment?           f = File.new( temp_path )           f.binmode           return f.read         else           return nil         end       end (before, the method body was save_attachment? ? File.read( temp_path ) :  nil  ) 

Rails2.0 and heroku the awesome rails app hosting

2008-01-09T06:35:00.000+09:00

Check it out. It's free and looks cool. I was frustrated by googling free rails hosting all day. Of course there're many hosting sites with shining options. But for testing, it's too expensive. Anyway I found the heroku.com. With Rails2.0 and Amazon S3, this site will dominate all the other hosting sites. Why? because they'll support Gems & Plugins Manager which made me annoying.

There're also some screencasts.

So, for now you'd better freeze your gems by using Dr Nic's Gems on Rails.

To install the plugin:

> gem install gemsonrails > cd rails-app-folder > gemsonrails

Usage:

rake gems:freeze   GEM=gem_to_freeze rake gems:link     GEM=gem_to_link rake gems:unfreeze GEM=gem_to_unfreeze_or_unlink

gem install gemsonrails cd app-folder gemsonrails rake gems:freeze GEM=ruby-net-ldap

(Though freezed gem does not work properly now)

Papervision3D

2007-11-23T15:03:00.000+09:00

Papervision3D is now part of the OSFlash family.

http://osflash.org/tutorials
http://blog.papervision3d.org/
http://aralbalkan.com/850

Papervision3D (also see PaperVision.org) is a high-performance 3D engine for Flash 8 and Flash 9. It was started and is led by Carlos Ulloa and the process of open sourcing it began around the end of October, last year. Once open-sourced

3D Star Wars demo

Tink’s Papervision3D Effects for Flex

integrating Papervision3D with Flex in a clean and seamless way.

Tink starts with Cube, Flip, Rotate and Zoom, but most importantly he lays the foundation for anyone to do their own effects in a matter of minutes. Certainly the easiest way to incorporate 3D effects in your Flex application.

PV3D Effects for Flex

Presentation: PDF.
Source: see Papervision3D Effects for Flex Source

like mac.. lol

2007-11-10T00:22:00.000+09:00

Oracle and rails. Begginers' error screen.

2007-11-06T02:09:00.000+09:00

While I was doing db:migrate, I got this message. I've made several sites on the same db and typed db:migrate again.

ORA-00955 Error. You can solve this problem by drop table xxxx_seq;

Yes. It is a begginers' mistake. And now it works fine with Oracle after
dropping ****_seq table.

-_-)/ I want a macbook...

2007-10-28T01:41:00.001+09:00

Seoul subway guide(From Dongnimmun to Samgakji)

2007-10-08T21:23:00.000+09:00

Hi. I made this for my friend Ronald. I thought that this can help others
who are planning to visit Seoul. To see the larger image, click each one please.

Creating a database on Oracle 10g.

2007-09-22T01:54:00.000+09:00

While creating a database on Oracle 10g, I've got this f*****g message.
It was time zone problem. And here is the solution.

http://download-uk.oracle.com/docs/cd/B19306_01/install.102/b14316/postcfg.htm#BABFAEIG):

1. Log on as a batch job
2. Act as part of the operating system
3. Adjust memory quotas for a process
4. Replace a process level token

ruby-gsl on windows - cygwin howto

2007-09-10T23:52:00.000+09:00

I wanted to use gruff. But it seems that doesn't support complex math functions. So I decided to choose gnuplot and gsl which turned out pretty confusing, especially on cygwin. I googled all day to find out how to invoke gem command on cygwin(Yeah. I was fool.) Anyway here is what I've found. I hope this will help you too.

1. installing cygwin including gnuplot and gsl
(http://www2.warwick.ac.uk/fac/sci/moac/currentstudents/peter_cock/cygwin/part5/)

Default permissions

As mentioned in http://cygwin.com/ml/cygwin/2006-01/msg00257.html, the default permissions for a Cygwin installation are rwxrwxrwx. Even if you don't care about the security implications, Ruby does. You might get sick of seeing Ruby make complaints like:

warning: Insecure world writable dir /usr/local/bin, mode 040777

The directory and exact mode may differ, but you'll need to chmod o-w the directory in question. Here's the minimal set of changes I needed to make to keep Ruby quiet:

chmod o-w /usr/local/bin
chmod o-w /usr/local
chmod o-w /usr
chmod o-w /etc
chmod o-w /usr/sbin
chmod o-w /usr/bin
chmod o-w /usr/X11R6/bin
chmod o-w /usr/X11R6
chmod o-w /cygdrive/c

Of course, this still leaves every binary on your system world-writable. Strangely, Ruby's happy to run world-writable binaries, as long as the directory they're in isn't world-writable.

2. If your want to use gem properly on cygwin, you need to alias commands.
home/.bashrc contains a set of aliases

# Force the c:/ruby version to be found first
PATH=/cygdrive/c/ruby/bin:$PATH

alias autotest='ruby /ruby/bin/autotest'
alias cap='ruby /ruby/bin/cap'
alias gem='ruby /ruby/bin/gem'
alias rake='ruby /ruby/bin/rake'
alias rcov='ruby /ruby/bin/rcov'
alias ruby='/cygdrive/c/ruby/bin/ruby'
alias specrb='ruby /ruby/bin/specrb'

3. installing ruby-gsl
http://ruby-gsl.sourceforge.net/
- download ruby-gsl
- ./configure
- make
- make install

4. Happy coding.

If you have some troubles such as "permission denied" while installing plotutils,
check this article =>
http://ptolemy.eecs.berkeley.edu/~cxh/ptpub/nt/ptntinstall.html

I've installed gem on cygwin.

unset RUBYOPT
chmod -R a+w /usr/lib/ruby/site_ruby/1.8/rubygems
ruby setup.rb
(no more permission denied Errorno:EACCES)

And I followed this article.
http://www.gfd-dennou.org/arch/ruby/

airborne cats

2007-06-20T03:19:00.000+09:00

This is from airborne cats. His photoes are famous among cat lovers.

Why (-9.5).round isn't -9?

2007-04-11T15:13:00.000+09:00

Ruby
Why (-9.5).round isn't -9?
From irb console, if you type (-9.5).round, you'll get -10 as a result.Why this occur? You can see same answer from Microsoft Excel.So I searched RDoc. And here's the answer.

1. num.round => integerRounds num to the nearest integer. Numeric implements
this by converting itself to a Float and invoking Float#round.

2. flt.round => integerRounds flt to the nearest integer. Equivalent to:

def round
return (self+0.5).floor if self > 0.0
return (self-0.5).ceil if self <0.0
return 0
end

1.5.round #=> 2
(-1.5).round #=> -2

3. num.ceil => integerReturns the smallest Integer greater than or equal to num. Class Numeric achieves this by converting itself to a Float then invoking Float#ceil.

1.ceil #=> 1
1.2.ceil #=> 2
(-1.2).ceil #=> -1
(-1.0).ceil #=> -1

4. flt.ceil => integerReturns the smallest Integer greater than or
equal to flt.
1.2.ceil #=>2
2.0.ceil #=> 2
-1.2).ceil #=> -1
(-2.0).ceil #=> -2

If you want real answer for that, use (-9.5).ceil

(-9.49999999999999999999999999).round #=> -10
(-9.49999999999999999999999999).ceil #=> -9
(9.49).round #=> 9
(9.49999999999999999999).round #=> 10

Buffon's Needle Simulation through Ruby

2007-04-08T17:48:00.001+09:00

I'm reading "Beautiful Evidence" written by Edward Tufte. His view point about information is very amusing. Because we are currently facing tons of informations that forms our decisions. Too much informations lead us to simple conclusions that we didn't intend("Paradox of choice" written by Barry Schwartz). So it's important to consume informations properly. In this context, "Beautiful Evidence" is crucial for us as far as I think. I've done some coding through Ruby to get PI. And visualized it by Gruff. This fundamental simulation is just beginning of my simualtion work. This ruby code isn't polished yet. But you can test Gruff. Thanks Geoffey!

Installing Gruff.
http://nubyonrails.com/pages/gruff

1. Install imagemagick.
Download file at ftp://ftp.kddlabs.co.jp/graphics/ImageMagick/linux/SRPMS/

2. Install RMagick
From http://rubyforge.org/frs/?group_id=12
download rmagick-1.15.5.gem and then type
> gem install rmagick-1.15.5.gem --local

3. Install Gruff 설치
Just type
> gem install gruff
While installing it will ask you to install dependency files. Just say yes

> gem install sparklines

4.You need ariel font to use Gruff.
If you don't have it on your system, follow the specific steps from here.
http://tomcopeland.blogs.com/juniordeveloper/2006/02/charts_and_grap.html

Ruby script 2 exe

2007-03-22T09:43:00.000+09:00

http://www.erikveen.dds.nl/rubyscript2exe/index.html

Someone already made script to make exe file. It's so easy.
Just type

ruby rubyscript2exe.rb application.rb[w] [parameters]

IDEO Method Cards

2007-03-04T23:53:00.000+09:00

IDEO Method Cards shows 51 ways of prtotyping thinking. I think programmers also need this card deck. Why ruby is so popular? One reason could be fast prtotyping...

Minority Report

2007-02-13T04:45:00.000+09:00

The world is waiting to see Minority Report. And it's so close. Jeff Han's Perceptive Pixel is gaining the market share. He will speak at Ted talk in this year too. I'm longing to see his next presentation. It seems that Apple's "Pile" interface is integrated with this one. May be, new mac would be a giant display(wall size?) pc.

Everyware: The Dawning Age of Ubiquitous Computing

2007-02-12T20:09:00.000+09:00

A book recommended by DLD07 Video podcast "Interface and design" session.
And you can buy it at http://www.yes24.com/Goods/FTGoodsView.aspx?goodsNo=1927945&CategoryNumber=002
These are some resources that Adam Greenfield suggests
http://v-2.org/bookshelf.php
http://www.v-2.org/

Apple "Pile"

2007-02-12T17:53:00.000+09:00

United States Patent Application	20070033537
Kind Code	A1
Mander; Richard ; et al.	February 8, 2007

Method and apparatus for organizing information in a computer system

Abstract

A method and apparatus for organizing information in a computer filing system. The method and apparatus include the creation of a pile comprising a collection of documents and displaying a graphical representation of the collection of documents. The method and apparatus further include browsing the collection of documents by pointing a cursor at a particular item in the collection of documents to reveal an indicia for the particular item in the collection of documents. The filing system can automatically divide a pile (e.g. a collection of documents from an electronic mail network) into subpiles on the basis of the content of each document in the pile, and the filing system, at the users request can automatically file away documents into existing piles in the computer system on the basis of a similarity match between the content (or other internal representation) of the document and the content (or other internal representation) of existing piles in the computer system. The filing system can also create a pile from a sample document by using the internal representation of the document as the internal representation of the new pile. The computer filing system provides various interfaces in connection with piles to the user of the system to provide feedback and other information to the user, including information concerning the documents and piles in the computer's filing system.

Inventors:	Mander; Richard; (Palo Alto, CA) ; Rose; Daniel E.; (San Jose, CA) ; Salomon; Gitta; (Palo Alto, CA) ; Wong; Yin Yin; (Menlo Park, CA) ; Oren; Timothy; (Sunnyvale, CA) ; Booker; Susan; (San Carlos, CA) ; Houde; Stephanie; (Cambridge, MA)
Correspondence Name and Address:	BLAKELY SOKOLOFF TAYLOR & ZAFMAN 12400 WILSHIRE BOULEVARD SEVENTH FLOOR LOS ANGELES CA 90025-1030 US
Serial No.:	497460
Series Code:	11
Filed:	July 31, 2006

U.S. Current Class:	715/764; 707/100; 715/810
U.S. Class at Publication:	715/764; 715/810; 707/100
Intern'l Class:	G06F 3/00 20060101 G06F003/00; G06F 17/00 20060101 G06F017/00; G06F 7/00 20060101 G06F007/00

PHP vs Java vs Ruby

2007-02-05T19:53:00.000+09:00

I linked the original article. Anyway it really was fun to read the article.

Bray, who is Director of Web Technologies at Sun Microsystems, co-creator of the XML 1.0 and XML Namespace standards, co-founder of Open-Text, and contributor to the Atom Publishing standard (whew!) spoke in a presentation entitled “How to combine PHP technology with Java based on Enterprise Systems”

“Mostly because there’s less code. The fact that Ruby forces MVC on you helps too, also the fact that the templating and [Object Relational Mapping (ORM)] and testing and application code are all so tightly integrated helps. Bear in mind that we still don’t know how well Rails is going to work outside of the CRUD-centered greenfield app space where it shines.”

My thoughts about web 2.0

2007-02-04T22:16:00.000+09:00

As a result, web is about seeing entertainment stuffs, and other informations that you want. As a platform, it is moving to small devices. But seeing is equivalent element. So imaging technology is core aspect. I think Adobe's stategy about this would conquer the debate around ajax technologies. They're currently focusing on integrating PDF and Flash format. Soon we'll see the results.

Algorithms in the Attic

2007-02-03T00:44:00.000+09:00

This article was posted on HBR this month.

One reason why math is important at this timing.

"For a powerful perspective on future business, take a hard look at mathematics past. As computing gets ever faster and cheaper, yesterday’s abstruse equations are becoming platforms for tomorrow’s breakthroughs. Companies in several industries are now dusting off these formulas and putting them in the service of new products and processes."

"Why should past work, often quite theoretical, be so useful now? Done in the absence of high-speed, low-cost computational capacity, that work put a premium on imaginative quantitative thinking. With today’s high-powered processors and broadband networks, those abstractions can point the way to practical software that leaps over current operational constraints.Disruptive opportunities abound."

Podcast list

2007-02-01T16:26:00.000+09:00

This is pocast list that I listen. The speed of changing is so fast that It's impossilbe to catch it with alone. So you share your view points with friends. This list may help you to build that view points. (Many poeple may already knows about these lists) I captured the list for my friends who are not yet familiar with iTunes. I thought providing raw datas that are quoted many times from news and bloggers would be another advice for my friends than "my poit of view". Web 2.0 Summit podcast was brilliant. I recommand it if you are interested in Web2.0 and the Long tail stories.

Doing math.

2007-01-28T11:08:00.000+09:00

Well, it's not that easy to say I'm not good at math. Since I realized math is the core of Alogrithm, I had to study it from the basic(actually, from highschool level). When I first gone through downloaded course which was about differential and integral calcus, I was so humiliated by my ignorance about math. For math is a tool for analyzing agolrithms, it's inevitable to study them.

Need time..

2007-01-01T23:57:00.000+09:00

I need time to improve my learnings including rubyonrails and math.

mac osx on intel core2duo laptop

2006-12-09T18:06:00.000+09:00

I'm currently making effort to install osx on my laptop (LG LW25 Advanced). I installed it through vmware 5.5. Installing was quite easy comparing with Windows XP. But the problem was drivers. The notebook native keyboard was usb and touchpad was ps/2. It have to be use same interfaces in order to work. As a result, I had to plug another usb keyboard. OSX was really beutiful. Now I know why people are fallen love with apple. If you want to use it, go to forum.insanelymac.com and x86osx.com.

Beginning Ruby on Rails E-Commerce

2006-11-29T10:00:00.000+09:00

Beginning Ruby on Rails E-Commerce

Sample Chapter

web2.0 submit video link

2006-11-24T10:33:00.000+09:00

Kevin Rose is the famous people of this year as far as I think.

He is the founder and chief architect of digg, where he oversees all aspects of the management and development of the digg web site. The basic idea is not that unique though, the interface of the site is easy to grasp. He's 2 years older than me.
digg.com is based on bloggers' participations.

http://www.web2con.com/pub/w/49/conversations.html

tourist attraction

2006-11-08T12:45:00.000+09:00

Well, I've never been abroad so far. And one region that I want to be is Swiss. They're invention exhibition once a year.(web search needed here). Of course I can see the major contents though, seeing is better.
May be learning is experiencing new things like kids doing. So the main purpose of tour is learning. Some part of learning would be get fresh ideas. In this aspect, going to a design gallery is exactly the samething for me. When I see creative works done by designers reminds me to think and act out of box. Such break-through *** can be learned as far as I think. But unfortunately I haven't get much free time to take a trip, I've tried to see fresh galleries. It's not like eat fastfoods. Anyway I hope to be in Swiss someday. Are there a site that shows me greate inspiring videos? Yes. The Ausraila **** site does. Here is the link. Nature is another source of creativity. Why creativity is crucial for me? Now it's changing too fast that only parianoids survive.

Basically I fully agree with "The World is Flat". So if you want to survive, you have to creative and know where my strengths are. Traveling and communicate various people based on multi cultures will broaden(?) my limits so that make you flexible.

leisure

2006-11-01T14:29:00.000+09:00

What I most hate leisure would be bungee jumping that I never tried before though. At my leisure time, I usually watch movies and animations that I downloaded from internet. And read new articles through google reader. I rarely do physical activities. Some day I should give a shot for in-line skating. May be I do not make social contacts in these days. Or my friends are too busy currently. It's easier to say than to act. Most of us knows what we should do but we do not make something to action. Bungee jumping is one of those things for me. Well, I could be the one who do not like changes. Uncommon things are avoided. I want to be a man with a strength who got no fear to fail. But as I said, it's not that easy to get a character like that. When I first learned to ride a bicycle, I learned for myselef. It was unavoidable not to fall for me.

ruby on rails

2006-11-01T09:05:00.000+09:00

PHP, ASP, JSP, RUBY

Well, ruby is not that popular though, I'm planning to digg it further. There're only one ruby-on-rails hosting site in Korea. So I paid them for my school web project. For now, we didn't make any significant progress. Still working on it. But the codes of ruby is so beautiful that I just can't resist to use and learn it. May be that could be one reason that ruby manias are after it. The address of our site is http://jaigouk.koruby.com/prisonbreak/public . In the future user applications would be based on web. Without learning web technologies like ajax, it would be hard to survive as a programmer. There're already plenty of API mesh-up sites(http://www.programmableweb.com/matrix). Now it's time to ignite your ideas.

About hobbies

2006-10-11T12:29:00.000+09:00

I don't usually go to theatre for it's a costly way of killing time comparing with internet downloading. My love of films is in the crime and thriller genre. Favorites movie lists are Matrix, The Seven, The usual suspects, Fight Club, Lock Stock and Two Smoking Barrels, Snatch, Prison Break, and japan animations like Ghost in the shell.

People, including myself, like stories. They love storytellers. In internet era, it isn't easy to find original stories. It's highly possible to confront copies. If you want to grab real source of the article, you would do googling. And then narrow down your search results. This isn't that easy as to say.

In my free time, I surf the web in order to catch up on the recent edge-tech, interesting business stories. It's not about the money but about the stories that everybody would enjoy such as StarWars or HarryPotter. There are many other web-surfers like me who want to grab real original stuffs. To help those people, some guys devleoped filters using web2.0 technologies. This could be one reason why blogging is spread so widely in these days. The Long tail theory is all about these filters. Bright ideas are come from a few people, and you can visit his / her blog.

You can go to my favorite blogs right side bar on this blog. There are venture capitalist blog and the other blogs related with web2.0. I recommand you to visit Life Hacker and TED.com. At Life Hacker, you will find s/w, web sites reviews that make your life more productive. The TED (Technology, Entertainment, Design) conference is an annual event where leading thinkers and doers gather for inspiration. The TEDBlog covers the same ground, on a rather more frequent basis. Here is one of those. Malcolm Gladwell, the author of "The tipping point", on TEDTalks.

Dream

2006-10-04T17:38:00.000+09:00

Life isn't that long if you think more deeply. And it's not always happy. Once you get your goals in your hand, soon it turns out boring . Nothing goes forever. So what's really important in life? I mean literally real stuffs by your heart. Let's think about this just a few minutes with me.

Though it would be variable depend on your sense of values about life, working is one of them. Because you can plan something interesting to you, and then see it's outcomes. How things would end? Curiosity could be one reason for that. However if you've chosen something boring , there would be no curiosities and pleasures. Have you seen a movie "The Matrix"? You've got to choose only one pill. Red one? Blue one? It's up to you. Take whatever you want. But you may end your life chasing the money. I encourage you to get out of "the matrix" and live your own life. Of course it's not that easy. Reality isn't sweet. Though I say choise is crucial to begin your journey to freedom.

Are you following me? Now it's time to talk about the ways to accomplish our goal. It seems like gather pirate companies who are eager to take risks for treasures.

Free Science and Video Lectures Online!

2006-10-03T16:58:00.000+09:00

Entire college COURSES on computer science.
Computer Architecture, Operating System Analysis, Programming Languages, the list goes on and on. Spread the love! It's like getting a full college education for free. Originally posted on digg.com. You will find it's quite useful.

SUBJECTS LIST
=======================================
Web Applications
Structure and Interpretation of Computer Programs
Data Structures
Machine Structures
Programming Languages
Principles of Software Engineering
Object Oriented Program Design
Algorithms
Computer System Engineering
Graduate Computer Architecture
Operating Systems and System Programming
Performance Analysis
Database Management Systems
Transaction Processing for E-Commerce
Practical Aspects of Modern Cryptography
Theory of Computation
Artificial Intelligence (4 lectures)
Applications of Artificial Intelligence

Best Friends

2006-10-03T15:16:00.000+09:00

My best friends are now running a business in NY. They are eager to deliver bright ideas to reality. Somehow they got funded. It's not easy to get in touch with them for now. Some day I'll go to NY to see them. A few years ago, I've tried to launch an idea related in RFID which was closed without any outputs. It's always hard to overcome the barriers in real world. However without any adventures, life is boring enough. My friends and I likes to take risks to enjoy our life. That's me. And that's my real friends having no fear to embrace the hard facts that lies infront of us. In a way, we are pirates who went to unknown sea to discover tresures. I'm currently in South Korea studying computer science for now. It will take about 2 years to finish it. I hope to join my friends soon...

Web programming class - project team logo

2006-09-15T09:33:00.000+09:00

I'm attending a web programming class which need a project team. Team name is "Prison Break", I made a web2.0 style logo via http://msig.info/web2.php. This site automaticaly generate Flickr style logos. I thought this solution is just appropriate for us.

I requested a free web hosting at http://www.freeonrails.com/. Still waiting the administrator's answer. I'm plannig to use Ruby on Rails as our web server framework. Here is the message that I posted.

================================================

Hello. I'm a student majoring in computer science in Korea.My friends and I are studying Ruby on Rails and ajax. By googling I found freeonrails, and registered without hesitating. For now we want to make a project site. In class, we are practicing javascript. It wan't easy to find a hosting site which give little sapce with Ruby on Rails capability in Korea. I'm 28 years old, and interested in Web2, Long Tail theory. I think there still are posibilities to start a biz through web. Ideas are flowing everywhere, and changes are too fast to catch. Agile development with Ruby on Rails would help at this point. I'm looking forward your permission.Thank you.

Future of Web Apps

2006-09-14T23:52:00.000+09:00

Tom Coates gave one of the best conference presentations ever today at The Future of Web Apps in San Francisco. It doesn't look like his slides are online, but you can see his presentation from the last Future of Web Apps conference here.

How can I add value to the Aggregate Web?
A web of data sources, services for exploring and manipulating data,
and ways that users can connect them together

Native to a Web of Data
1. Look to add value to the Aggregate Web of data
2. Build for normal users, developers and machines
3. Start designing with data, not with pages
4. Identify your first order objects and make them addressable
5. Use readable, reliable and hackable URLs
6. Correlate with external identifier schemes
7. Build list views and batch manipulation interfaces
8. Create parallel data services using standards
9. Make your data as discoverable as possible

Starting your job - making good impression

2006-09-14T19:48:00.000+09:00

Good first impression comes from the attitude and your answers. Those are rooted on your thoughts about the way you look at other people. So before you make some actions, consider about yourself. How do you think about other people? With respect of someone else, even though some people look naive to you, you can speak and behave nice. You don't have to rethink about your behaviors are appropriate or not. Without such mind, you may make some mistakes by accident. Having respects for others guides you to open but affirmative view points. Because you accept others' opinions, you will not underestimate any little possibilities. Hence your ideas grow richer. Though a company has its own corporate culture, they need new ideas. Because they're always seeking new business models. With your out-of-box mind, feed them your imaginations. You will be welcomed. Your unique view points about recent social topics will help you to go on conversations with new co-workers. If you have gone to army, such experiences would be one choice among general topics to break the ice. Now you can reinforce your impressions with little more skills such as memorizing your team members' names, and sparkling eye contacts.

Trust and reliability needs some time. Therefore check your mind time to time not to lose it. First good impressions are crucial for your job. But long-living reputations are more critical for your future. When you start to feel that you're losing such minds, go to kindergarten and talk with kids. Soon you'll find how kids are creative and smart. There's no limit. Once you get back to this respect-oriented mind, your behaviors will be appropriate.