Some changes I made to the vanilla Rails / Spork / RSpec setup to ensure models get reloaded

a

# make sure your rspec block has the cli => drb line:
guard 'rspec', :cli => "--drb", :version => 2 do

c

YourApp::Application.configure do
  ...
  config.cache_classes = false
end

d

gem "spork"
gem 'guard-spork'

gemfile.rb

gem 'guard'
gem 'guard-rspec'

# required for notifications via growl
gem 'ruby_gntp' 

guardfile

guard 'rspec', :cli => "--drb", :version => 2 do

guardfile-with-drb.rb

# change this:
guard 'spork', :cucumber_env => { 'RAILS_ENV' => 'test' }, 
               :rspec_env => { 'RAILS_ENV' => 'test' } do

# to this:
guard 'spork', :cucumber_env => { 'RAILS_ENV' => 'test' }, 
               :rspec_env => { 'RAILS_ENV' => 'test' },
               :cli => "--drb" do
  # ...
end

guardfile.rb

# -------- How your guardfile will look initially
guard 'rspec', :version => 2 do
  ...
end

guard 'spork', :cucumber_env => { 'RAILS_ENV' => 'test' }, 
               :rspec_env => { 'RAILS_ENV' => 'test' } do
  ...
end

# ---- How your guardfile SHOULD look
guard 'spork', :cucumber_env => { 'RAILS_ENV' => 'test' }, 
               :rspec_env => { 'RAILS_ENV' => 'test' } do
  ...
end

guard 'rspec', :version => 2 do
  ...
end

spec_helper.rb

# spec helper file
...
Spork.prefork do
  ...
  # add this line to the prefork block - helps avoid crashes (as well as reloading routes)
  Spork.trap_method(Rails::Application::RoutesReloader, :reload!)
end

test.rb

YourApp::Application.configure do
  ...
  config.cache_classes = false
end