2 files changed, 29 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/fixnum/inflections.rb b/activesupport/lib/active_support/core_ext/fixnum/inflections.rb
new file mode 100644
index 0000000000..13c4f1130a
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/fixnum/inflections.rb
@@ -0,0 +1,15 @@
+require File.dirname(__FILE__) + '/../../inflector'
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Fixnum #:nodoc:
+      module Inflections
+        # 1.ordinalize  # => "1st"
+        # 3.ordinalize  # => "3rd"
+        # 10.ordinalize # => "10th"
+        def ordinalize
+          Inflector.ordinalize(self)
+        end
+      end
+    end
+  end
+end
diff --git a/activesupport/lib/active_support/inflector.rb b/activesupport/lib/active_support/inflector.rb
index 88f56403c8..be25a93687 100644
--- a/activesupport/lib/active_support/inflector.rb
+++ b/activesupport/lib/active_support/inflector.rb
@@ -60,6 +60,19 @@ module Inflector
     end
   end
 
+  def ordinalize(number)
+    if (11..13).include?(number.to_i % 100)
+      "#{number}th"
+    else
+      case number.to_i % 10
+        when 1: "#{number}st"
+        when 2: "#{number}nd"
+        when 3: "#{number}rd"
+        else    "#{number}th"
+      end
+    end
+  end
+
   private
     def uncountable_words #:doc
       %w( equipment information rice money species series fish )
@@ -121,4 +134,4 @@ module Inflector
         [/s$/i, '']
       ]
     end
-end
-\ No newline at end of file
+end