fishman · September 13, 2012 16:03 · Mar 8, 2012 · Mar 8, 2012 · Mar 8, 2012 · Mar 5, 2012
diff --git a/Gemfile b/Gemfile
@@ -1,7 +1,8 @@
 source :rubygems
 
-# We are not loading Active Record, nor the Assets Pipeline, etc.
-# You can do this by simply replacing the rails gem by its parts.
+# We are not loading Active Record, nor Active Resources etc.
+# We can do this in any app by simply replacing the rails gem
+# by the parts we want to use.
 gem "actionpack", "~> 3.2"
 gem "railties",   "~> 3.2"
 gem "tzinfo"

diff --git a/config.ru b/config.ru
@@ -4,7 +4,18 @@
 #
 # And access:
 #
-#   http://localhost:3000/hello/world  
+#   http://localhost:3000/hello/world
+#
+# We are using Bundler in this example, but we could also
+# have used rubygems:
+#
+#   require "rubygems"
+#
+#   gem "actionpack"
+#   gem "railties"
+#
+#   require "rails"
+#   require "rails/all"
 
 # The following lines should come as no surprise. Except by
 # ActionController::Metal, it follows the same structure of
@@ -45,7 +56,7 @@ class HelloController < ActionController::Metal
   end
 end
 
-# Initialize the app
+# Initialize the app (originally in config/environment.rb)
 MyApp.initialize!
 
 # Print the stack for fun!
@@ -55,5 +66,5 @@ Rails.configuration.middleware.each do |middleware|
 end
 puts "run #{Rails.application.class.name}.routes"
 
-# Run it!
+# Run it (originally in config.ru)
 run MyApp
diff --git a/Gemfile b/Gemfile
@@ -0,0 +1,10 @@
+source :rubygems
+
+# We are not loading Active Record, nor the Assets Pipeline, etc.
+# You can do this by simply replacing the rails gem by its parts.
+gem "actionpack", "~> 3.2"
+gem "railties",   "~> 3.2"
+gem "tzinfo"
+
+# Let's use thin
+gem "thin"
diff --git a/config.ru b/config.ru
@@ -1,11 +1,10 @@
-# Run this file with `RAILS_ENV=production rackup -p 3000 -s thin`
-# Be sure to have rails and thin installed.
-require "rubygems"
-
-# We are not loading Active Record, nor the Assets Pipeline, etc.
-# This could also be in your Gemfile.
-gem "actionpack", "~> 3.2"
-gem "railties",   "~> 3.2"
+# Run this file with:
+#
+#   bundle exec RAILS_ENV=production rackup -p 3000 -s thin
+#
+# And access:
+#
+#   http://localhost:3000/hello/world  
 
 # The following lines should come as no surprise. Except by
 # ActionController::Metal, it follows the same structure of

diff --git a/config.ru b/config.ru
@@ -26,6 +26,8 @@ class MyApp < Rails::Application
   # Here you could remove some middlewares, for example
   # Rack::Lock, AD::Flash and AD::BestStandardsSupport below.
   # The remaining stack is printed on rackup (for fun!).
+  # Rails 4 will have config.middleware.api_only! to get
+  # rid of browser related middleware.
   config.middleware.delete "Rack::Lock"
   config.middleware.delete "ActionDispatch::Flash"
   config.middleware.delete "ActionDispatch::BestStandardsSupport"

diff --git a/config.ru b/config.ru
@@ -34,7 +34,7 @@ class MyApp < Rails::Application
   config.secret_token = "49837489qkuweoiuoqwehisuakshdjksadhaisdy78o34y138974xyqp9rmye8yrpiokeuioqwzyoiuxftoyqiuxrhm3iou1hrzmjk"
 end
 
-# This is a barebone controller. Include the modules you want, more info here:
+# This is a barebone controller. One good reference can be found here:
 # http://piotrsarnacki.com/2010/12/12/lightweight-controllers-with-rails3/
 class HelloController < ActionController::Metal
   include ActionController::Rendering

diff --git a/config.ru b/config.ru
@@ -7,20 +7,25 @@ require "rubygems"
 gem "actionpack", "~> 3.2"
 gem "railties",   "~> 3.2"
 
+# The following lines should come as no surprise. Except by
+# ActionController::Metal, it follows the same structure of
+# config/application.rb, config/environment.rb and config.ru
+# existing in any Rails 3 app. Here they are simply in one
+# file and without the comments.
 require "rails"
-require "action_controller/railtie"
+require "rails/all"
 
 class MyApp < Rails::Application
   routes.append do
     match "/hello/world" => "hello#world"
   end
 
-  # Enable cache classes
+  # Enable cache classes. Production style.
   config.cache_classes = true
 
-  # Here you could remove some middlewares, for example,
+  # Here you could remove some middlewares, for example
   # Rack::Lock, AD::Flash and AD::BestStandardsSupport below.
-  # The remaining stack is printed on rackup.
+  # The remaining stack is printed on rackup (for fun!).
   config.middleware.delete "Rack::Lock"
   config.middleware.delete "ActionDispatch::Flash"
   config.middleware.delete "ActionDispatch::BestStandardsSupport"

diff --git a/config.ru b/config.ru
@@ -15,10 +15,12 @@ class MyApp < Rails::Application
     match "/hello/world" => "hello#world"
   end
 
+  # Enable cache classes
+  config.cache_classes = true
+
   # Here you could remove some middlewares, for example,
   # Rack::Lock, AD::Flash and AD::BestStandardsSupport below.
-  # The remaining stack is printed on rackup. Rails 4 will
-  # have a config.middleware.clear for those wishing a clear slate.
+  # The remaining stack is printed on rackup.
   config.middleware.delete "Rack::Lock"
   config.middleware.delete "ActionDispatch::Flash"
   config.middleware.delete "ActionDispatch::BestStandardsSupport"

diff --git a/config.ru b/config.ru
@@ -1,27 +1,25 @@
 # Run this file with `RAILS_ENV=production rackup -p 3000 -s thin`
 # Be sure to have rails and thin installed.
 require "rubygems"
-require "rails"
 
-# Let's load only action controller. If you want
-# to use active record, just require it as well.
+# We are not loading Active Record, nor the Assets Pipeline, etc.
+# This could also be in your Gemfile.
+gem "actionpack", "~> 3.2"
+gem "railties",   "~> 3.2"
+
+require "rails"
 require "action_controller/railtie"
 
 class MyApp < Rails::Application
   routes.append do
     match "/hello/world" => "hello#world"
   end
 
-  # Let's shrink the stack by removing some middlewares.
-  # The remaining stack is printed below. Add or remove stuff at will.
-  config.middleware.delete "ActionDispatch::Static"
+  # Here you could remove some middlewares, for example,
+  # Rack::Lock, AD::Flash and AD::BestStandardsSupport below.
+  # The remaining stack is printed on rackup. Rails 4 will
+  # have a config.middleware.clear for those wishing a clear slate.
   config.middleware.delete "Rack::Lock"
-  config.middleware.delete "Rack::MethodOverride"
-  config.middleware.delete "Rails::Rack::Logger"
-  config.middleware.delete "ActionDispatch::DebugExceptions"
-  config.middleware.delete "ActionDispatch::RequestId"
-  config.middleware.delete "ActionDispatch::RemoteIp"
-  config.middleware.delete "ActionDispatch::Reloader"
   config.middleware.delete "ActionDispatch::Flash"
   config.middleware.delete "ActionDispatch::BestStandardsSupport"
 

diff --git a/config.ru b/config.ru
@@ -13,7 +13,7 @@ class MyApp < Rails::Application
   end
 
   # Let's shrink the stack by removing some middlewares.
-  # The remaining stack is printed below.
+  # The remaining stack is printed below. Add or remove stuff at will.
   config.middleware.delete "ActionDispatch::Static"
   config.middleware.delete "Rack::Lock"
   config.middleware.delete "Rack::MethodOverride"

diff --git a/config.ru b/config.ru
@@ -0,0 +1,53 @@
+# Run this file with `RAILS_ENV=production rackup -p 3000 -s thin`
+# Be sure to have rails and thin installed.
+require "rubygems"
+require "rails"
+
+# Let's load only action controller. If you want
+# to use active record, just require it as well.
+require "action_controller/railtie"
+
+class MyApp < Rails::Application
+  routes.append do
+    match "/hello/world" => "hello#world"
+  end
+
+  # Let's shrink the stack by removing some middlewares.
+  # The remaining stack is printed below.
+  config.middleware.delete "ActionDispatch::Static"
+  config.middleware.delete "Rack::Lock"
+  config.middleware.delete "Rack::MethodOverride"
+  config.middleware.delete "Rails::Rack::Logger"
+  config.middleware.delete "ActionDispatch::DebugExceptions"
+  config.middleware.delete "ActionDispatch::RequestId"
+  config.middleware.delete "ActionDispatch::RemoteIp"
+  config.middleware.delete "ActionDispatch::Reloader"
+  config.middleware.delete "ActionDispatch::Flash"
+  config.middleware.delete "ActionDispatch::BestStandardsSupport"
+
+  # We need a secret token for session, cookies, etc.
+  config.secret_token = "49837489qkuweoiuoqwehisuakshdjksadhaisdy78o34y138974xyqp9rmye8yrpiokeuioqwzyoiuxftoyqiuxrhm3iou1hrzmjk"
+end
+
+# This is a barebone controller. Include the modules you want, more info here:
+# http://piotrsarnacki.com/2010/12/12/lightweight-controllers-with-rails3/
+class HelloController < ActionController::Metal
+  include ActionController::Rendering
+
+  def world
+    render :text => "Hello world!"
+  end
+end
+
+# Initialize the app
+MyApp.initialize!
+
+# Print the stack for fun!
+puts ">> Starting Rails lightweight stack"
+Rails.configuration.middleware.each do |middleware|
+  puts "use #{middleware.inspect}"
+end
+puts "run #{Rails.application.class.name}.routes"
+
+# Run it!
+run MyApp