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A collection of 10 posts

TOKYO Rails #19

TOKYO Rails #19

During our trip in Tokyo last month, I and my wife attended TOKYO Rails #19 at COOKPAD, and that is fantastic. While I don't actually coding Rails lately, I'm lucky to met a few iOS developers and exchanged a bit, such as introducing もじバトル, SplitCam and EverClip, and see some

RubyMotion gotchas (1)

When using RubyMotion, just like many other new technologies or frameworks, I found gotchas and scratch my head over them. I'm writing them down in case I might forget them. I hope this may help you or give you ideas on daily issues you might face when using RubyMotion. When

Error Decoding msgpack data: invalid byte sequence in UTF-8

My new app use msgpack to encode data before sending to server. On server side, its a Sinatra app that decode and store the data to database. The app works fine until I push real data. With real data the app crash with error "invalid byte sequence in UTF-8". After

Using DTrace with RubyMotion

Want to profile or analyze your RubyMotion application? How to use Instrument with motion is not yet known, but you can always use powerful DTrace to do that. Turns out running DTrace in RubyMotion is exactly same as that in MacRuby (no surprise!). motion-dtrace is a proof of concept to

Create gems for RubyMotion

While RubyMotion featured using rubygems to extend projects, the actual steps to do so is not documented until motion-redgreen gems demonstrate it. Define A Gem Making gem for Motion is not unlike that for standard gems, with some exceptions. To add a gem to your RubyMotion project, instead of using

Using 3rd party ruby library in RubyMotion

Update: Check the post Create gems for RubyMotion on example to create a gem for rubymotion. These few days I have been playing with RubyMotion. They have documents on using Objective-C libraries. So using familiar library such as TouchJSON is not an issue. How about using Ruby library such as

有關 Bundler 的二三事

今天聽 Ruby Rouges podcast #045，學了一些之前不懂的 bundler 小知識. Dependency management 問題是 NP-Complete Bundler，或任何 dependency management 軟件的算法，也是 NP-Complete 的問題。 Bundler 的工作其實是在所有 dependencies 的版本上搜尋能符合 Gemfile 內容的解。大部份情況 bundler 也可以很快找到答案，但有一些 Gemfile 會讓 bundler 停轉。雖然看上去像 bug，但實際上不是個 bundler 作者可以輕易解決的問題。話雖如此，但其實有方法加快 bundler 的搜尋：在 Gemfile 的 dependencies 盡量指定你想要的版本。例如這個 Gemfile

用 Vagrant 快速建立開發環境

這次要談談如何建立開發環境。理想的開發環境如果你曾經做過一些十人以上、持續一年以上的專案，你就會知道開發環境的重要性。我以前就待過一個專案：專案有 J2EE Server、RDBMS 還有外部的 legacy 系統。雖然開始時很好地設定了 Development、UAT 和 Production 環境，但經歷漫長的開發和改版，Development 環境的資料總是爛的： * 一些被改動到不合 constraint 的資料 * 一些設定是錯誤的 * 有時缺少了重要的 Data * 沒有運行的 server 或 backend job * 開發者的錯誤會讓 DB 或 Apps 全爛了，整隊人得花一天以上等待修復。。。在開發的時候，我們需要的是一個快速建立、可以重現、一步到位而且每個開發者獨立的開發環境。這時候 Vagrant 就可以幫到我們了。 30 秒內學會使用 Vagrant Vagrant

在 cron job 裡用 rvm

rvm 解決了 server 上有不同版本的 ruby 和 gems 的問題。但如果後台要行 cron job ，怎樣才能使用 rvm 呢？直接在 cron 裡用 rvm 是不行的。這其實是個很基本的 cron use case (雖然每隔一段時間我就會忘記...)，答案是在 cron 裡開一個新的 bash ： * * * * * /bin/bash -l -c 'cd /var/production/project/current; bundle exec rake cron' > /var/production/project/shared/log/cron.log 2>&1

正確在 XCode 4 上使用 MacRuby + RubyGems

昨天突然有個 idea 想做成 app ，拉起 MacRuby 和 XCode 寫起來。最近版本的 MacRuby 跟 XCode 的整合已相當不錯，基本上安裝好後就可以用了，然而我還是遇上了一個 gem 的問題： /Users/siuying/Library/Developer/Xcode/DerivedData/OOOO-dduzvbnelkxkfwbejosjlbcndmpk/Build/Products/Debug/OOOO.app/Contents/Resources/Controller.rb:10:in `

': no such file to load -- rdiscount (LoadError) XCode 找不到我的 rdiscount gem。當然，