I learned that the plural form of "status" is "status" on Rails 0.13. But when I upgraded to Rails 0.14, it turns out that the plural form of "status" is "statuses". Then I put these ugly lines to config/environment.rb:(

Inflector.inflections do |inflect|
  inflect.plural /status$/i, 'status'
  inflect.singular /status$/i, 'status'
end

Please take care if you're not a native English speaker. Hereafter, I'll lookup a dictionary before name tables....