Some of you may be wondering "why would you want to use Rails without a database?" There are several situations why a database would not be needed, and I've run into quite a few of them. One of the specific cases was when I wanted to write a web interface for an application that only had a REST interface available to the public.
If you find yourself needing to write a Rails application without a database, just do the following:
For Rails 1.0 and up:
config/environment.rb:
config.frameworks -= [ :active_record ]
test/test_helper.rb
class Test::Unit::TestCase self.use_transactional_fixtures = false self.use_instantiated_fixtures = false def load_fixtures end end
For Rails 2.1 and up: Comment out both of the lines that begin with ActiveRecord::Base in config/initializers/new_rails_defaults.rb:
if defined?(ActiveRecord) # Include Active Record class name as root for JSON serialized output. # ActiveRecord::Base.include_root_in_json = true # Store the full class name (including module namespace) in STI type column. # ActiveRecord::Base.store_full_sti_class = true end
For more details, review the full article on rubyonrails.org.

Nice work!
It works for me,
first i removed the comment for config.frameworks -= [ :active_record ] in 'config/environment.rb'
then i added comments inside the file 'config/initializers/new_rails_defaults.rb.'
Now it works for me.
But i cannot understand what to do in test/test_helper.rb.
my test_helper.rb is like this
ENV["RAILS_ENV"] = "test"
require File.expand_path(File.dirname(__FILE__) + "/../config/environment")
require 'test_help'
class ActiveSupport::TestCase
self.use_transactional_fixtures = true
self.use_instantiated_fixtures = false
fixtures :all
end
Please tell me the purpose of the test_helper.rb file and what to do now