Rails: String#singularize

Documentation

The reverse of pluralize, returns the singular form of a word in a string.

Examples

• "posts".singularize #=> "post"
• "octopi".singularize #=> "octopus"
• "sheep".singluarize #=> "sheep"
• "word".singluarize #=> "word"
• "the blue mailmen".singularize #=> "the blue mailman"
• "CamelOctopi".singularize #=> "CamelOctopus"

Usage
I generally use singularize when metaprogrammming to convert from a potentially plural version of a class name to something that I know can be constantized.

Test

require 'rubygems'
require 'active_support'
require 'test/unit'
require 'dust'

unit_tests do
  test "change plural word to singular word" do
    assert_equal "class_name", "class_names".singularize
  end
end