Checkin forgotten add. Update const_missing handler to avoid double loading files.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4729 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/lib/active_support/dependencies.rb

@@ -155,7 +155,7 @@ module Dependencies #:nodoc:
     name_error = NameError.new("uninitialized constant #{qualified_name}")
     
     file_path = search_for_autoload_file(path_suffix)
-    if file_path # We found a matching file to load
+    if file_path #&& ! loaded.include?(file_path) # We found a matching file to load
       require_or_load file_path, qualified_name
       raise LoadError, "Expected #{file_path} to define #{qualified_name}" unless from_mod.const_defined?(const_name)
       return from_mod.const_get(const_name)

activesupport/test/dependencies_test.rb

@@ -300,4 +300,13 @@ class DependenciesTest < Test::Unit::TestCase
     end
   end
   
+  def test_const_missing_should_not_double_load
+    with_loading 'autoloading_fixtures' do
+      require_dependency 'counting_loader'
+      assert_equal 1, $counting_loaded_times
+      ModuleFolder
+      assert_equal 1, $counting_loaded_times
+    end
+  end
+  
 end