Allow railties to specify generators paths.

railties/lib/rails/application.rb

@@ -8,7 +8,7 @@ class Application
     class << self
       attr_writer :config
       alias configure class_eval
-      delegate :initialize!, :load_tasks, :root, :to => :instance
+      delegate :initialize!, :load_tasks, :load_generators, :root, :to => :instance
 
       private :new
       def instance
@@ -82,6 +82,10 @@ def load_tasks
       end
     end
 
+    def load_generators
+      plugins.each { |p| p.load_generators }
+    end
+
     def initializers
       initializers = Bootstrap.new(self).initializers
       plugins.each { |p| initializers += p.initializers }

railties/lib/rails/generators.rb

@@ -168,7 +168,7 @@ def self.invoke(namespace, args=ARGV, config={})
 
     # Show help message with available generators.
     def self.help
-      traverse_load_paths!
+      lookup!
 
       namespaces = subclasses.map{ |k| k.namespace }
       namespaces.sort!
@@ -226,22 +226,10 @@ def self.invoke_fallbacks_for(name, base) #:nodoc:
         nil
       end
 
-      # This will try to load any generator in the load path to show in help.
-      def self.traverse_load_paths! #:nodoc:
-        $LOAD_PATH.each do |base|
-          Dir[File.join(base, "{generators,rails_generators}", "**", "*_generator.rb")].each do |path|
-            begin
-              require path
-            rescue Exception => e
-              # No problem
-            end
-          end
-        end
-      end
-
       # Receives namespaces in an array and tries to find matching generators
       # in the load path.
       def self.lookup(namespaces) #:nodoc:
+        load_generators_from_railties!
         paths = namespaces_to_paths(namespaces)
 
         paths.each do |path|
@@ -261,6 +249,28 @@ def self.lookup(namespaces) #:nodoc:
         end
       end
 
+      # This will try to load any generator in the load path to show in help.
+      def self.lookup! #:nodoc:
+        load_generators_from_railties!
+
+        $LOAD_PATH.each do |base|
+          Dir[File.join(base, "{generators,rails_generators}", "**", "*_generator.rb")].each do |path|
+            begin
+              require path
+            rescue Exception => e
+              # No problem
+            end
+          end
+        end
+      end
+
+      # Allow generators to be loaded from custom paths.
+      def self.load_generators_from_railties! #:nodoc:
+        return if defined?(@generators_from_railties) || Rails.application.nil?
+        @generators_from_railties = true
+        Rails.application.load_generators
+      end
+
       # Convert namespaces to paths by replacing ":" for "/" and adding
       # an extra lookup. For example, "rails:model" should be searched
       # in both: "rails/model/model_generator" and "rails/model_generator".

railties/lib/rails/railtie.rb

@@ -35,13 +35,28 @@ def self.rake_tasks(&blk)
       @rake_tasks
     end
 
+    def self.generators(&blk)
+      @generators ||= []
+      @generators << blk if blk
+      @generators
+    end
+
     def rake_tasks
       self.class.rake_tasks
     end
 
+    def generators
+      self.class.generators
+    end
+
     def load_tasks
       return unless rake_tasks
       rake_tasks.each { |blk| blk.call }
     end
+
+    def load_generators
+      return unless generators
+      generators.each { |blk| blk.call }
+    end
   end
 end

railties/test/generators_test.rb

@@ -148,6 +148,13 @@ def self.name() 'NewGenerator' end
     Rails::Generators.subclasses.delete(klass)
   end
 
+  def test_load_generators_from_railties
+    Rails::Generators::ModelGenerator.expects(:start).with(["Account"], {})
+    Rails::Generators.send(:remove_instance_variable, :@generators_from_railties)
+    Rails.application.expects(:load_generators)
+    Rails::Generators.invoke("model", ["Account"])
+  end
+
   def test_rails_root_templates
     template = File.join(Rails.root, "lib", "templates", "active_record", "model", "model.rb")
 

railties/test/plugins/framework_extension_test.rb

@@ -30,6 +30,22 @@ class MyTie < Rails::Railtie
       AppTemplate::Application.load_tasks
       assert $ran_block
     end
+
+    test "generators block is executed when MyApp.load_generators is called" do
+      $ran_block = false
+
+      class MyTie < Rails::Railtie
+        generators do
+          $ran_block = true
+        end
+      end
+
+      require "#{app_path}/config/environment"
+
+      assert !$ran_block
+      AppTemplate::Application.load_generators
+      assert $ran_block
+    end
   end
 
   class ActiveRecordExtensionTest < Test::Unit::TestCase