I’m encountering a problem when trying to go through the Rails4Days
tutorial: http://www.rails4days.pwp.blueyonder.co.uk/Rails4Days.pdf. As
the guide suggests I have downloaded the version of rails that is being
used in the tutorial with gem and have specified the versions in
/config/environment.rb:
Include your application configuration below
Require Rails libraries.
require ‘rubygems’
gem ‘activesupport’, ‘= 1.0.4’
gem ‘activerecord’, ‘= 1.10.1’
gem ‘actionpack’, ‘= 1.8.1’
gem ‘actionmailer’, ‘= 0.9.1’
gem ‘actionwebservice’, ‘= 0.7.1’
gem ‘rails’, ‘= 0.12.1’
When I try to execute the following command:
$ script/generate model category exists app/models/ exists test/unit/
exists test/fixtures/ create app/models/category.rb create
test/unit/category_test.rb create test/fixtures/categories.yml
I receive this error:
/usr/local/lib/site_ruby/1.8/rubygems.rb:246:in activate': can't activate activesupport (= 1.0.4), already activated activesupport-1.4.2] (Gem::Exception) from /usr/local/lib/site_ruby/1.8/rubygems.rb:76:in active_gem_with_options’
from /usr/local/lib/site_ruby/1.8/rubygems.rb:50:in gem' from ./script/../config/../config/environment.rb:64 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in require’
from
/usr/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/generate.rb:1
from
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in `require’
from script/generate:3
I’ve tried searching google without success. Any suggestions would be
very much appreciated as I would love to complete this tutorial.