Added config.app_generators to allow configuring application's generators from railties.

With config.generators becomes a way to configure generators
for current instance only. For example:

module Blog
  class Engine < Rails::Engine
    config.generators do |g|
      g.orm :active_record
    end

    config.app_generators do |g|
      g.test_framework :rspec
    end
  end
end

such definition sets :active_record as orm for engine and :rspec
as test_framework for application. The values set with app_generators
can be overwritten in application using config.generators as you would
normally do:

module MyApp
  class Application < Rails::Application
    config.generators do |g|
      g.test_framework :test_unit
    end
  end
end

3 files changed, 18 insertions, 4 deletions

diff --git a/railties/lib/rails/application/configuration.rb b/railties/lib/rails/application/configuration.rb
index a0ecbc0fc8..f902c3ded2 100644
--- a/railties/lib/rails/application/configuration.rb
+++ b/railties/lib/rails/application/configuration.rb
@@ -24,6 +24,7 @@ module Rails
         @time_zone = "UTC"
         @middleware = app_middleware
         @asset_path = '/'
+        @generators = app_generators
       end
 
       def asset_path=(value)
diff --git a/railties/lib/rails/railtie/configuration.rb b/railties/lib/rails/railtie/configuration.rb
index f09e3940cc..e0e4324a4a 100644
--- a/railties/lib/rails/railtie/configuration.rb
+++ b/railties/lib/rails/railtie/configuration.rb
@@ -17,6 +17,19 @@ module Rails
         @@app_middleware ||= Rails::Configuration::MiddlewareStackProxy.new
       end
 
+      # This allows you to modify application's generators from Railties.
+      #
+      # Values set on app_generators will become defaults for applicaiton, unless
+      # application overwrites them.
+      def app_generators
+        @@app_generators ||= Rails::Configuration::Generators.new
+        if block_given?
+          yield @@app_generators
+        else
+          @@app_generators
+        end
+      end
+
       # Holds generators configuration:
       #
       #   config.generators do |g|
@@ -30,11 +43,11 @@ module Rails
       #   config.generators.colorize_logging = false
       #
       def generators
-        @@generators ||= Rails::Configuration::Generators.new
+        @generators ||= Rails::Configuration::Generators.new
         if block_given?
-          yield @@generators
+          yield @generators
         else
-          @@generators
+          @generators
         end
       end
 
diff --git a/railties/lib/rails/test_unit/railtie.rb b/railties/lib/rails/test_unit/railtie.rb
index e3fafc4b9d..2b6170ebfb 100644
--- a/railties/lib/rails/test_unit/railtie.rb
+++ b/railties/lib/rails/test_unit/railtie.rb
@@ -1,6 +1,6 @@
 module Rails
   class TestUnitRailtie < Rails::Railtie
-    config.generators do |c|
+    config.app_generators do |c|
       c.test_framework :test_unit, :fixture => true,
                                    :fixture_replacement => nil