Creating ApplicationModel methods.

These methods will be used by the ApplicationModel to send the correct
configuration.

Author: wangjohn

activerecord/lib/active_record.rb

@@ -33,6 +33,7 @@ module ActiveRecord
   extend ActiveSupport::Autoload
 
   autoload :Attribute
+  autoload :ApplicationConfiguration
   autoload :Base
   autoload :Callbacks
   autoload :Core

activerecord/lib/active_record/application_configuration.rb

@@ -0,0 +1,17 @@
+module ActiveRecord
+  module ApplicationConfiguration
+    extend ActiveSupport::Concern
+
+    module ClassMethods
+      def configs_from(application)
+        app_model = self
+
+        application.singleton_class.instance_eval do
+          define_method(:application_model) { app_model }
+        end
+
+        define_singleton_method(:configs_from_application) { application }
+      end
+    end
+  end
+end

activerecord/lib/active_record/base.rb

@@ -284,6 +284,7 @@ class Base
     extend Delegation::DelegateCache
 
     include Core
+    include ApplicationConfiguration
     include Persistence
     include ReadonlyAttributes
     include ModelSchema

railties/lib/rails/generators/rails/app/templates/app/models/application_model.rb.tt

@@ -1,3 +1,4 @@
 class ApplicationModel < ActiveRecord::Base
   self.abstract_class = true
+  configs_from Rails.application
 end

railties/test/application/rake_test.rb

@@ -99,7 +99,7 @@ def test_should_not_eager_load_model_for_rake
     end
 
     def test_code_statistics_sanity
-      assert_match "Code LOC: 8     Test LOC: 0     Code to Test Ratio: 1:0.0",
+      assert_match "Code LOC: 9     Test LOC: 0     Code to Test Ratio: 1:0.0",
         Dir.chdir(app_path){ `rake stats` }
     end