Nomadicoder » programming

Quick RVM Rubinius 1.0.0 Install Recipe

Steven — Tue, 25 May 2010 18:54:42 +0000

Here are the quick and dirty commands I used to install Rubinius 1.0.0 with Rails, RSpec, and Sinatra in RVM on Mac OS X. ~~So far I haven’t been able to get Cucumber to install.~~

The problem has been fixed with the 1.0.1 release. I have added commands to install Cucumber support.


rvm install rbx
rvm rbx
gem update --system --no-ri --no-rdoc
gem update --no-ri --no-rdoc
gem install rails --no-ri --no-rdoc
gem install sqlite3-ruby --no-ri --no-rdoc
gem install rspec --no-ri --no-rdoc
gem install rspec-rails --no-ri --no-rdoc
gem install cucumber --no-ri --no-rdoc
gem install cucumber-rails --no-ri --no-rdoc
gem install sinatra --no-ri --no-rdoc

Ordering on a Field in a Linked Table

Steven — Tue, 02 Feb 2010 05:55:19 +0000

I attempted to order my runners based on their assigned stage number. The stage number is linked by the stage_id in the schema and the class shows that it belongs to a stage:


class Runner > ActiveRecord::Base
  belongs_to :stage
end

At first glance, I figure I would simply order on the stage number:


def self.find_all_runners
  find ( :all, :order => "stage.number" )
end

But this resulted in a “no such column” error:

SQLite3::SQLException: no such column: stages.number: SELECT * FROM “runners” ORDER BY stages.number

I found the solution in Ryan Daigle’s blog. In order for this to work you need a :joins to the linked table so Active Record knows the origin of stage.number. In my application, the find should be:


def self.find_all_runners
  find ( :all, :joins => :stage, :order => "stages.number" )
end

IT Conversations: Kent Beck

Steven — Wed, 27 Aug 2008 12:38:42 +0000

The Conversations Network recently released an IT Conversations show I did post production on. Kent Beck tells stories about how his pioneering work in Test Driven Development, Design Patterns and Extreme Programming. Link.

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