Modified String#pluralize to take an optional count parameter.

activesupport/lib/active_support/core_ext/string/inflections.rb

@@ -9,14 +9,25 @@
 class String
   # Returns the plural form of the word in the string.
   #
+  # If the optional parameter +count+ is specified,
+  # the singular form will be returned if <tt>count == 1</tt>.
+  # For any other value of +count+ the plural will be returned.
+  #
+  # ==== Examples
   #   "post".pluralize             # => "posts"
   #   "octopus".pluralize          # => "octopi"
   #   "sheep".pluralize            # => "sheep"
   #   "words".pluralize            # => "words"
   #   "the blue mailman".pluralize # => "the blue mailmen"
   #   "CamelOctopus".pluralize     # => "CamelOctopi"
-  def pluralize
-    ActiveSupport::Inflector.pluralize(self)
+  #   "apple".pluralize(1)         # => "apple"
+  #   "apple".pluralize(2)         # => "apples"
+  def pluralize(count = nil)
+    if count == 1
+      self
+    else
+      ActiveSupport::Inflector.pluralize(self)
+    end
   end
 
   # The reverse of +pluralize+, returns the singular form of a word in a string.
@@ -42,7 +53,7 @@ def singularize
   def constantize
     ActiveSupport::Inflector.constantize(self)
   end
-  
+
   # +safe_constantize+ tries to find a declared constant with the name specified
   # in the string. It returns nil when the name is not in CamelCase
   # or is not initialized.  See ActiveSupport::Inflector.safe_constantize

activesupport/test/core_ext/string_ext_test.rb

@@ -20,7 +20,7 @@ class Case
 class StringInflectionsTest < Test::Unit::TestCase
   include InflectorTestCases
   include ConstantizeTestCases
-  
+
   def test_erb_escape
     string = [192, 60].pack('CC')
     expected = 192.chr + "&lt;"
@@ -64,6 +64,10 @@ def test_pluralize
     end
 
     assert_equal("plurals", "plurals".pluralize)
+
+    assert_equal("blargles", "blargle".pluralize(0))
+    assert_equal("blargle", "blargle".pluralize(1))
+    assert_equal("blargles", "blargle".pluralize(2))
   end
 
   def test_singularize
@@ -301,13 +305,13 @@ def test_truncate_multibyte
         "\354\225\204\353\246\254\353\236\221 \354\225\204\353\246\254 \354\225\204\353\235\274\353\246\254\354\230\244".force_encoding('UTF-8').truncate(10)
     end
   end
-  
+
   def test_constantize
     run_constantize_tests_on do |string|
       string.constantize
     end
   end
-  
+
   def test_safe_constantize
     run_safe_constantize_tests_on do |string|
       string.safe_constantize
@@ -381,7 +385,7 @@ def to_s
   test "A fixnum is safe by default" do
     assert 5.html_safe?
   end
-  
+
   test "a float is safe by default" do
     assert 5.7.html_safe?
   end

railties/guides/source/active_support_core_extensions.textile

@@ -1426,6 +1426,14 @@ The method +pluralize+ returns the plural of its receiver:
 
 As the previous example shows, Active Support knows some irregular plurals and uncountable nouns. Built-in rules can be extended in +config/initializers/inflections.rb+. That file is generated by the +rails+ command and has instructions in comments.
 
++pluralize+ can also take an optional +count+ parameter.  If <tt>count == 1</tt> the singular form will be returned.  For any other value of +count+ the plural form will be returned:
+
+<ruby>
+"dude".pluralize(0) # => "dudes"
+"dude".pluralize(1) # => "dude"
+"dude".pluralize(2) # => "dudes"
+</ruby>
+
 Active Record uses this method to compute the default table name that corresponds to a model:
 
 <ruby>