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Archive for December 2010

My presentation at BarCamp Saigon 2010

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It’s my first attendance at BarCamp Saigon. It’s very impressed to meet and talk with some cool guys. I do hope there will be some events like this, especially for .NET developers community where everybody can come, learn and share. If you are interesting, please drop me a line.

Below are slides of my presentation on Ruby on Rails 3.

Written by Nam

December 14, 2010 at 10:52 pm

Posted in Ruby On Rails

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Rails3: Getting started with a weird error

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I came across errors in installing rails with version 3.0.0 in today. The error message said that ‘mail requires i18n (~> 0.4.1, runtime)’. This is story of versions and it is not new in OSS at all. It has been discouraging who are not only beginners.

Some guys suggested installing i18n version 0.5.0 before rails. OK, it helps you get through the error. But wait, you will continue getting another error when creating a new rails application. Rails will complaint versions of gem i18n, 0.5.0 and 0.4.2. Some gems depend on 0.5.0 and others depend on 0.4.2.

Mail gem depends on version 0.5.0 of i18n. Taking a look at version of this gem, the version 2.2.11 is just updated in recent days, Nov 29, 2010. My experience in installing rails version 3.0.0 before had no these errors. I tried to install the previous version of mail gem, 2.2.10. I also checked version of dependencies at here. As you may see, the version 2.2.10 of mail gem requires version i18n gem greater than 0.4.1. So I thought choosing the version 0.4.2 of i18n will match requirement of other gems, and mail gem version 2.2.10 as well.

The following are steps to install.

  • gem install i18n -v=0.5.0
  • gem install rails -v=3.0.0
  • gem uninstall i18n (choose version 0.5.0 to uninstall)
  • gem uninstall mail
  • gem install mail -v=2.2.10
  • rails new hello_app

Hope this helps.

Written by Nam

December 4, 2010 at 4:03 pm

Posted in Ruby On Rails

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