1 files changed, 35 insertions, 25 deletions
diff --git a/activesupport/lib/active_support/duration.rb b/activesupport/lib/active_support/duration.rb
index fd9b505c2f..cbee4fd0ca 100644
--- a/activesupport/lib/active_support/duration.rb
+++ b/activesupport/lib/active_support/duration.rb
@@ -6,11 +6,11 @@ module ActiveSupport
   #   1.month.ago       # equivalent to Time.now.advance(:months => -1)
   class Duration < BasicObject
     attr_accessor :value, :parts
-    
+
     def initialize(value, parts) #:nodoc:
       @value, @parts = value, parts
     end
-    
+
     # Adds another Duration or a Numeric to this Duration. Numeric values
     # are treated as seconds.
     def +(other)
@@ -20,39 +20,49 @@ module ActiveSupport
         Duration.new(value + other, @parts + [[:seconds, other]])
       end
     end
-    
+
     # Subtracts another Duration or a Numeric from this Duration. Numeric
     # values are treated as seconds.
     def -(other)
       self + (-other)
     end
-    
+
     def -@ #:nodoc:
       Duration.new(-value, parts.map { |type,number| [type, -number] })
     end
-    
+
     def is_a?(klass) #:nodoc:
       klass == Duration || super
     end
-    
+
+    # Returns true if <tt>other</tt> is also a Duration instance with the
+    # same <tt>value</tt>, or if <tt>other == value</tt>.
+    def ==(other)
+      if Duration === other
+        other.value == value
+      else
+        other == value
+      end
+    end
+
     def self.===(other) #:nodoc:
       other.is_a?(Duration) rescue super
     end
-    
+
     # Calculates a new Time or Date that is as far in the future
     # as this Duration represents.
     def since(time = ::Time.now)
       sum(1, time)
     end
     alias :from_now :since
-    
+
     # Calculates a new Time or Date that is as far in the past
     # as this Duration represents.
     def ago(time = ::Time.now)
       sum(-1, time)
     end
     alias :until :ago
-    
+
     def inspect #:nodoc:
       consolidated = parts.inject(Hash.new(0)) { |h,part| h[part.first] += part.last; h }
       [:years, :months, :days, :minutes, :seconds].map do |length|
@@ -60,27 +70,27 @@ module ActiveSupport
         "#{n} #{n == 1 ? length.to_s.singularize : length.to_s}" if n.nonzero?
       end.compact.to_sentence
     end
-    
+
     protected
-    
-    def sum(sign, time = ::Time.now) #:nodoc:
-      parts.inject(time) do |t,(type,number)|
-        if t.acts_like?(:time) || t.acts_like?(:date)
-          if type == :seconds
-            t.since(sign * number)
+
+      def sum(sign, time = ::Time.now) #:nodoc:
+        parts.inject(time) do |t,(type,number)|
+          if t.acts_like?(:time) || t.acts_like?(:date)
+            if type == :seconds
+              t.since(sign * number)
+            else
+              t.advance(type => sign * number)
+            end
           else
-            t.advance(type => sign * number)
+            raise ArgumentError, "expected a time or date, got #{time.inspect}"
           end
-        else
-          raise ArgumentError, "expected a time or date, got #{time.inspect}"
         end
       end
-    end
-    
+
     private
-    
-    def method_missing(method, *args, &block) #:nodoc:
-      value.send(method, *args)
-    end
+
+      def method_missing(method, *args, &block) #:nodoc:
+        value.send(method, *args)
+      end
   end
 end