Fixed issue #6363, avoid to pluralized already pluralized names and singularize a single in generators, for example stadia is a valid plural for stadium. But calling pluralize for stadia will return stadias which sematically is not corrent in this case

[#6363 state:committed]

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

railties/lib/rails/generators/named_base.rb

@@ -118,11 +118,11 @@ module Rails
         end
 
         def singular_table_name
-          @singular_table_name ||= table_name.singularize
+          @singular_table_name ||= (pluralize_table_names? ? table_name.singularize : table_name)
         end
 
         def plural_table_name
-          @plural_table_name ||= table_name.pluralize
+          @plural_table_name ||= (pluralize_table_names? ? table_name : table_name.pluralize)
         end
 
         def plural_file_name

railties/test/generators/named_base_test.rb

@@ -98,6 +98,11 @@ class NamedBaseTest < Rails::Generators::TestCase
     assert_name g, 'posts', :index_helper
   end
 
+  def test_index_helper_to_pluralize_once
+    g = generator ['Stadium']
+    assert_name g, 'stadia', :index_helper
+  end
+
   def test_index_helper_with_uncountable
     g = generator ['Sheep']
     assert_name g, 'sheep_index', :index_helper