Fix broken module namespacing in ActiveResource with Ruby 1.9 [#5699 state:resolved]

Following namespace use case was broken with Ruby 1.9:

  class Author < ActiveRecord::Base
    ...
  end

  module Api
    class Book < ActiveResouce::Base
    end
  end

Let's say XML contains <book><author><name>John</name></author>....

  Api::Book.first.author.class.to_s #=>
    Ruby 1.8.7: "Api::Book::Author" (namespaced, correct),
    Ruby 1.9: "Author" (toplevel, broken)

Signed-off-by: José Valim <jose.valim@gmail.com>

activeresource/lib/active_resource/base.rb

@@ -1374,8 +1374,9 @@ module ActiveResource
         namespaces = module_names[0, module_names.size-1].map do |module_name|
           receiver = receiver.const_get(module_name)
         end
-        if namespace = namespaces.reverse.detect { |ns| ns.const_defined?(resource_name) }
-          return namespace.const_get(resource_name)
+        const_args = RUBY_VERSION < "1.9" ? [resource_name] : [resource_name, false]
+        if namespace = namespaces.reverse.detect { |ns| ns.const_defined?(*const_args) }
+          return namespace.const_get(*const_args)
         else
           raise NameError
         end
@@ -1391,8 +1392,9 @@ module ActiveResource
           self.class.const_get(resource_name)
         end
       rescue NameError
-        if self.class.const_defined?(resource_name)
-          resource = self.class.const_get(resource_name)
+        const_args = RUBY_VERSION < "1.9" ? [resource_name] : [resource_name, false]
+        if self.class.const_defined?(*const_args)
+          resource = self.class.const_get(*const_args)
         else
           resource = self.class.const_set(resource_name, Class.new(ActiveResource::Base))
         end

activeresource/test/abstract_unit.rb

@@ -75,6 +75,10 @@ def setup_response
     </person>
   eof
 
+  @startup_sound = { 
+      :name => "Mac Startup Sound", :author => { :name => "Jim Reekes" } 
+    }.to_xml(:root => 'sound') 
+
   ActiveResource::HttpMock.respond_to do |mock|
     mock.get    "/people/1.xml",                {}, @matz
     mock.get    "/people/2.xml",                {}, @david
@@ -112,6 +116,8 @@ def setup_response
     mock.head   "/people/Greg/addresses/1.xml", {}, nil, 200
     # customer
     mock.get    "/customers/1.xml",             {}, @luis
+    # sound
+    mock.get    "/sounds/1.xml",                {}, @startup_sound
   end
 
   Person.user = nil

activeresource/test/cases/base_test.rb

@@ -1097,4 +1097,9 @@ class BaseTest < Test::Unit::TestCase
     plan.save!
     assert_equal 10.00, plan.price
   end
+  
+  def test_namespacing
+    sound = Asset::Sound.find(1)
+    assert_equal "Asset::Sound::Author", sound.author.class.to_s
+  end
 end

activeresource/test/fixtures/sound.rb

@@ -1,5 +1,9 @@
-module Asset
+module Asset  
   class Sound < ActiveResource::Base
     self.site = "http://37s.sunrise.i:3000"
   end
 end
+
+# to test namespacing in a module
+class Author
+end