Improve custom configuration

1. Hashes can be assigned
2. We don't need a special level anymore

The method chain only works in the top level.

If users need a second level they need to assign a OrderedOptions to the
key:

    config.resque.server = ActiveSupport::OrderedOptions.new
    config.resque.server.url = "http://localhost"
    config.resque.server.port = 3000

[Rafael Mendonça França + Carlos Antonio da Silva]

8 files changed, 149 insertions, 46 deletions

diff --git a/guides/source/4_2_release_notes.md b/guides/source/4_2_release_notes.md
index 1c14519506..9937a947a5 100644
--- a/guides/source/4_2_release_notes.md
+++ b/guides/source/4_2_release_notes.md
@@ -75,22 +75,24 @@ Please refer to the [Changelog][railties] for detailed changes.
 *   Introduced an `after_bundle` callback for use in Rails templates.
     ([Pull Request](https://github.com/rails/rails/pull/16359))
 
-*   Introduced the `x` namespace for defining custom configuration options:
+*   Custom configuration options can be chained:
 
     ```ruby
     # config/environments/production.rb
-    config.x.payment_processing.schedule = :daily
-    config.x.payment_processing.retries  = 3
-    config.x.super_debugger = true
+    config.payment_processing.schedule = :daily
+    config.payment_processing.retries  = 3
+    config.resque = { timeout: 60, inline_jobs: :always }
+    config.super_debugger = true
     ```
 
     These options are then available through the configuration object:
 
     ```ruby
-    Rails.configuration.x.payment_processing.schedule # => :daily
-    Rails.configuration.x.payment_processing.retries  # => 3
-    Rails.configuration.x.super_debugger              # => true
-    Rails.configuration.x.super_debugger.not_set      # => nil
+    Rails.configuration.payment_processing.schedule # => :daily
+    Rails.configuration.payment_processing.retries  # => 3
+    Rails.configuration.resque.timeout              # => 60
+    Rails.configuration.resque.inline_jobs          # => :always
+    Rails.configuration.super_debugger              # => true
     ```
 
     ([Commit](https://github.com/rails/rails/commit/611849772dd66c2e4d005dcfe153f7ce79a8a7db))
diff --git a/guides/source/configuring.md b/guides/source/configuring.md
index 801cef5ca6..6922dd681a 100644
--- a/guides/source/configuring.md
+++ b/guides/source/configuring.md
@@ -1006,16 +1006,18 @@ Custom configuration
 You can configure your own code through the Rails configuration object with custom configuration. It works like this:
 
   ```ruby
-  config.x.payment_processing.schedule = :daily
-  config.x.payment_processing.retries  = 3
-  config.x.super_debugger = true
+  config.payment_processing.schedule = :daily
+  config.payment_processing.retries  = 3
+  config.resque = { timeout: 60, inline_jobs: :always }
+  config.super_debugger = true
   ```
 
 These configuration points are then available through the configuration object:
 
   ```ruby
-  Rails.configuration.x.payment_processing.schedule # => :daily
-  Rails.configuration.x.payment_processing.retries  # => 3
-  Rails.configuration.x.super_debugger              # => true
-  Rails.configuration.x.super_debugger.not_set      # => nil
+  Rails.configuration.payment_processing.schedule # => :daily
+  Rails.configuration.payment_processing.retries  # => 3
+  Rails.configuration.resque.timeout              # => 60
+  Rails.configuration.resque.inline_jobs          # => :always
+  Rails.configuration.super_debugger              # => true
   ```
diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index 5e2b82c3e9..72bf73cb26 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -13,16 +13,18 @@
     configure your own code through the Rails configuration object with custom configuration:
 
         # config/environments/production.rb
-        config.x.payment_processing.schedule = :daily
-        config.x.payment_processing.retries  = 3
-        config.x.super_debugger = true
+        config.payment_processing.schedule = :daily
+        config.payment_processing.retries  = 3
+        config.resque = { timeout: 60, inline_jobs: :always }
+        config.super_debugger = true
 
     These configuration points are then available through the configuration object:
 
-        Rails.configuration.x.payment_processing.schedule # => :daily
-        Rails.configuration.x.payment_processing.retries  # => 3
-        Rails.configuration.x.super_debugger              # => true
-        Rails.configuration.x.super_debugger.not_set      # => nil
+        Rails.configuration.payment_processing.schedule # => :daily
+        Rails.configuration.payment_processing.retries  # => 3
+        Rails.configuration.resque.timeout              # => 60
+        Rails.configuration.resque.inline_jobs          # => :always
+        Rails.configuration.super_debugger              # => true
 
     *DHH*
 
diff --git a/railties/lib/rails/application/configuration.rb b/railties/lib/rails/application/configuration.rb
index 782bc4b0f1..5e8f4de847 100644
--- a/railties/lib/rails/application/configuration.rb
+++ b/railties/lib/rails/application/configuration.rb
@@ -13,7 +13,7 @@ module Rails
                     :railties_order, :relative_url_root, :secret_key_base, :secret_token,
                     :serve_static_assets, :ssl_options, :static_cache_control, :session_options,
                     :time_zone, :reload_classes_only_on_change,
-                    :beginning_of_week, :filter_redirect, :x
+                    :beginning_of_week, :filter_redirect
 
       attr_writer :log_level
       attr_reader :encoding
@@ -48,7 +48,6 @@ module Rails
         @eager_load                    = nil
         @secret_token                  = nil
         @secret_key_base               = nil
-        @x                             = Custom.new
 
         @assets = ActiveSupport::OrderedOptions.new
         @assets.enabled                  = true
@@ -155,17 +154,6 @@ module Rails
       def annotations
         SourceAnnotationExtractor::Annotation
       end
-      
-      private
-        class Custom
-          def initialize
-            @configurations = Hash.new
-          end
-    
-          def method_missing(method, *args)
-            @configurations[method] ||= ActiveSupport::OrderedOptions.new
-          end
-        end
     end
   end
 end
diff --git a/railties/lib/rails/railtie/configuration.rb b/railties/lib/rails/railtie/configuration.rb
index eb3b2d8ef4..406ed5ac61 100644
--- a/railties/lib/rails/railtie/configuration.rb
+++ b/railties/lib/rails/railtie/configuration.rb
@@ -88,11 +88,49 @@ module Rails
 
       def method_missing(name, *args, &blk)
         if name.to_s =~ /=$/
-          @@options[$`.to_sym] = args.first
+          key = $`.to_sym
+          value = args.first
+
+          if value.is_a?(Hash)
+            @@options[key] = ChainedConfigurationOptions.new value
+          else
+            @@options[key] = value
+          end
         elsif @@options.key?(name)
           @@options[name]
         else
-          super
+          @@options[name] = ActiveSupport::OrderedOptions.new
+        end
+      end
+
+      class ChainedConfigurationOptions < ActiveSupport::OrderedOptions # :nodoc:
+        def initialize(value = nil)
+          if value.is_a?(Hash)
+            value.each_pair { |k, v| set_value k, v }
+          else
+            super
+          end
+        end
+
+        def method_missing(meth, *args)
+          if meth =~ /=$/
+            key = $`.to_sym
+            value = args.first
+
+            set_value key, value
+          else
+            self.fetch(meth) { super }
+          end
+        end
+
+        private
+
+        def set_value(key, value)
+          if value.is_a?(Hash)
+            value = self.class.new(value)
+          end
+
+          self[key] = value
         end
       end
     end
diff --git a/railties/test/application/configuration/base_test.rb b/railties/test/application/configuration/base_test.rb
index d6a82b139d..6e2b618160 100644
--- a/railties/test/application/configuration/base_test.rb
+++ b/railties/test/application/configuration/base_test.rb
@@ -5,6 +5,8 @@ require 'env_helpers'
 module ApplicationTests
   module ConfigurationTests
     class BaseTest < ActiveSupport::TestCase
+      include ActiveSupport::Testing::Isolation
+
       def setup
         build_app
         boot_rails
@@ -30,8 +32,8 @@ module ApplicationTests
         end
 
         def require_environment
-          require "#{app_path}/config/environment"  
+          require "#{app_path}/config/environment"
         end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/railties/test/application/configuration/custom_test.rb b/railties/test/application/configuration/custom_test.rb
index 045537fc28..e8c7a37913 100644
--- a/railties/test/application/configuration/custom_test.rb
+++ b/railties/test/application/configuration/custom_test.rb
@@ -1,15 +1,84 @@
 require 'application/configuration/base_test'
 
 class ApplicationTests::ConfigurationTests::CustomTest < ApplicationTests::ConfigurationTests::BaseTest
-  test 'access custom configuration point' do
+  test 'configuration top level can be chained' do
     add_to_config <<-RUBY
-      config.x.resque.inline_jobs = :always
-      config.x.resque.timeout     = 60
+      config.resque.inline_jobs = :always
+      config.resque.timeout     = 60
     RUBY
     require_environment
 
-    assert_equal :always, Rails.configuration.x.resque.inline_jobs
-    assert_equal 60, Rails.configuration.x.resque.timeout
-    assert_nil Rails.configuration.x.resque.nothing
+    assert_equal :always, Rails.configuration.resque.inline_jobs
+    assert_equal 60, Rails.configuration.resque.timeout
+    assert_nil Rails.configuration.resque.nothing
+  end
+
+  test 'configuration top level accept normal values' do
+    add_to_config <<-RUBY
+      config.timeout = 60
+      config.something_nil = nil
+      config.something_false = false
+      config.something_true = true
+    RUBY
+    require_environment
+
+    assert_equal 60, Rails.configuration.timeout
+    assert_equal nil, Rails.configuration.something_nil
+    assert_equal false, Rails.configuration.something_false
+    assert_equal true, Rails.configuration.something_true
+  end
+
+  test 'configuration top level builds options from hashes' do
+    add_to_config <<-RUBY
+      config.resque = { timeout: 60, inline_jobs: :always }
+    RUBY
+    require_environment
+
+    assert_equal :always, Rails.configuration.resque.inline_jobs
+    assert_equal 60, Rails.configuration.resque.timeout
+    assert_nil Rails.configuration.resque.nothing
+  end
+
+  test 'configuration top level builds options from hashes with string keys' do
+    add_to_config <<-RUBY
+      config.resque = { 'timeout' => 60, 'inline_jobs' => :always }
+    RUBY
+    require_environment
+
+    assert_equal :always, Rails.configuration.resque.inline_jobs
+    assert_equal 60, Rails.configuration.resque.timeout
+    assert_nil Rails.configuration.resque.nothing
+  end
+
+  test 'configuration top level builds nested options from hashes with symbol keys' do
+    add_to_config <<-RUBY
+      config.resque = { timeout: 60, inline_jobs: :always, url: { host: 'localhost', port: 8080 } }
+      config.resque.url.protocol = 'https'
+      config.resque.queues = { production: ['low_priority'] }
+    RUBY
+    require_environment
+
+    assert_equal(:always, Rails.configuration.resque.inline_jobs)
+    assert_equal(60, Rails.configuration.resque.timeout)
+    assert_equal({ host: 'localhost', port: 8080, protocol: 'https' }, Rails.configuration.resque.url)
+    assert_equal('localhost', Rails.configuration.resque.url.host)
+    assert_equal(8080, Rails.configuration.resque.url.port)
+    assert_equal('https', Rails.configuration.resque.url.protocol)
+    assert_equal(['low_priority'], Rails.configuration.resque.queues.production)
+    assert_nil(Rails.configuration.resque.nothing)
+  end
+
+  test 'configuration top level builds nested options from hashes with string keys' do
+    add_to_config <<-RUBY
+      config.resque = { 'timeout' => 60, 'inline_jobs' => :always, 'url' => { 'host' => 'localhost', 'port' => 8080 } }
+    RUBY
+    require_environment
+
+    assert_equal(:always, Rails.configuration.resque.inline_jobs)
+    assert_equal(60, Rails.configuration.resque.timeout)
+    assert_equal({ host: 'localhost', port: 8080 }, Rails.configuration.resque.url)
+    assert_equal('localhost', Rails.configuration.resque.url.host)
+    assert_equal(8080, Rails.configuration.resque.url.port)
+    assert_nil(Rails.configuration.resque.nothing)
   end
 end
diff --git a/railties/test/railties/engine_test.rb b/railties/test/railties/engine_test.rb
index ec64ce5941..da4eccd2b7 100644
--- a/railties/test/railties/engine_test.rb
+++ b/railties/test/railties/engine_test.rb
@@ -840,7 +840,7 @@ YAML
 
       Rails.application.load_seed
       assert Rails.application.config.app_seeds_loaded
-      assert_raise(NoMethodError) { Bukkits::Engine.config.bukkits_seeds_loaded }
+      assert_empty Bukkits::Engine.config.bukkits_seeds_loaded
 
       Bukkits::Engine.load_seed
       assert Bukkits::Engine.config.bukkits_seeds_loaded