Rename namespace method to isolate_namespace.

This change caused by confusion caused by calling engine
"namespaced". Stuff inside engine can be namespaced for every
engine. This method is not actually namespacing anything, it's
isolating engine within the given namespace.

railties/lib/rails/engine.rb

@@ -214,11 +214,11 @@ module Rails
   # as they would be created inside application. One of the cosequences of that is including
   # application's helpers and url_helpers inside controller. Sometimes, especially when your
   # engine provides its own routes, you don't want that. To isolate engine's stuff from application
-  # you can use namespace method:
+  # you can use isolate_namespace method:
   #
   #   module MyEngine
   #     class Engine < Rails::Engine
-  #       namespace MyEngine
+  #       isolate_namespace MyEngine
   #     end
   #   end
   #
@@ -252,7 +252,7 @@ module Rails
   #   end
   #
   #
-  # Additionaly namespaced engine will set its name according to namespace, so in that case:
+  # Additionaly isolated engine will set its name according to namespace, so in that case:
   # MyEngine::Engine.engine_name #=> "my_engine" and it will set MyEngine.table_name_prefix
   # to "my_engine_".
   #
@@ -315,7 +315,7 @@ module Rails
     autoload :Configuration, "rails/engine/configuration"
 
     class << self
-      attr_accessor :called_from, :namespaced
+      attr_accessor :called_from, :isolated
       alias :engine_name :railtie_name
 
       def inherited(base)
@@ -350,12 +350,12 @@ module Rails
         @endpoint
       end
 
-      def namespace(mod)
+      def isolate_namespace(mod)
         engine_name(generate_railtie_name(mod))
 
         name = engine_name
         self.routes.default_scope = {:module => name}
-        self.namespaced = true
+        self.isolated = true
 
         unless mod.respond_to?(:_railtie)
           _railtie = self
@@ -371,13 +371,13 @@ module Rails
         end
       end
 
-      def namespaced?
-        !!namespaced
+      def isolated?
+        !!isolated
       end
     end
 
     delegate :middleware, :root, :paths, :to => :config
-    delegate :engine_name, :namespaced?, :to => "self.class"
+    delegate :engine_name, :isolated?, :to => "self.class"
 
     def load_tasks
       super
@@ -506,7 +506,7 @@ module Rails
     end
 
     initializer :prepend_helpers_path do |app|
-      if !namespaced? || (app == self)
+      if !isolated? || (app == self)
         app.config.helpers_paths.unshift(*paths["app/helpers"].existent)
       end
     end

railties/test/generators/namespaced_generators_test.rb

@@ -6,14 +6,14 @@ require 'rails/generators/mailer/mailer_generator'
 
 class NamespacedGeneratorTestCase < Rails::Generators::TestCase
   def setup
-    TestApp::Application.namespace(TestApp)
+    TestApp::Application.isolate_namespace(TestApp)
   end
 
   def teardown
     if TestApp.respond_to?(:_railtie)
       TestApp.singleton_class.send(:undef_method, :_railtie)
       TestApp.singleton_class.send(:undef_method, :table_name_prefix)
-      TestApp::Application.namespaced = false
+      TestApp::Application.isolated = false
     end
   end
 end

railties/test/railties/engine_test.rb

@@ -394,7 +394,7 @@ module RailtiesTest
       @plugin.write "lib/bukkits.rb", <<-RUBY
         module Bukkits
           class Engine < ::Rails::Engine
-            namespace Bukkits
+            isolate_namespace Bukkits
           end
         end
       RUBY
@@ -511,7 +511,7 @@ module RailtiesTest
       @plugin.write "lib/bukkits.rb", <<-RUBY
         module Bukkits
           class Engine < ::Rails::Engine
-            namespace Bukkits
+            isolate_namespace Bukkits
           end
         end
       RUBY
@@ -572,7 +572,7 @@ module RailtiesTest
       @plugin.write "lib/bukkits.rb", <<-RUBY
         module Bukkits
           class Engine < ::Rails::Engine
-            namespace(Bukkits)
+            isolate_namespace(Bukkits)
           end
         end
       RUBY
@@ -593,7 +593,7 @@ module RailtiesTest
         @plugin.write "lib/bukkits.rb", <<-RUBY
           module Bukkits
             class Engine < ::Rails::Engine
-              namespace(Bukkits)
+              isolate_namespace(Bukkits)
               paths["public"] = "#{File.join(@plugin.path, "alternate_public")}"
             end
           end
@@ -611,7 +611,7 @@ module RailtiesTest
         @plugin.write "lib/bukkits.rb", <<-RUBY
           module Bukkits
             class Engine < ::Rails::Engine
-              namespace(Bukkits)
+              isolate_namespace(Bukkits)
               paths["public"] = "#{File.join(@plugin.path, "not_existing")}"
             end
           end
@@ -648,12 +648,12 @@ module RailtiesTest
       @plugin.write "lib/bukkits.rb", <<-RUBY
         module AppTemplate
           class Engine < ::Rails::Engine
-            namespace(AppTemplate)
+            isolate_namespace(AppTemplate)
           end
         end
       RUBY
 
-      add_to_config "namespace AppTemplate"
+      add_to_config "isolate_namespace AppTemplate"
 
       app_file "config/routes.rb", <<-RUBY
         AppTemplate::Application.routes.draw do end
@@ -686,7 +686,7 @@ module RailtiesTest
       @plugin.write "lib/bukkits.rb", <<-RUBY
         module Bukkits
           class Engine < ::Rails::Engine
-            namespace(Bukkits)
+            isolate_namespace(Bukkits)
           end
         end
       RUBY

railties/test/railties/mounted_engine_test.rb

@@ -49,7 +49,7 @@ module ApplicationTests
       @plugin.write "lib/blog.rb", <<-RUBY
         module Blog
           class Engine < ::Rails::Engine
-            namespace(Blog)
+            isolate_namespace(Blog)
           end
         end
       RUBY