TimeWithZone#- added, so that #- can handle a Time or TimeWithZone argument correctly

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8732 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/CHANGELOG

 *SVN*
 
+* TimeWithZone#- added, so that #- can handle a Time or TimeWithZone argument correctly [Geoff Buesing]
+
 * with_timezone test helper renamed with_env_tz, to distinguish between setting ENV['TZ'] and setting Time.zone in tests [Geoff Buesing]
 
 * Time#- coerces TimeWithZone argument to a Time instance so that difference in seconds can be calculated. Closes #10914 [Geoff Buesing, yyyc514]

activesupport/lib/active_support/time_with_zone.rb

@@ -107,6 +107,12 @@ def <=>(other)
       utc <=> other
     end
     
+    # Need to override #- to intercept situation where a Time or Time With Zone object is passed in
+    # Otherwise, just pass on to method missing
+    def -(other)
+      other.acts_like?(:time) ? utc - other : method_missing(:-, other)
+    end
+  
     # A TimeProxy acts like a Time, so just return self
     def to_time
       self

activesupport/test/core_ext/time_with_zone_test.rb

@@ -124,6 +124,7 @@ def test_minus_with_duration
     
     def test_minus_with_time
       assert_equal  86_400.0,  ActiveSupport::TimeWithZone.new( Time.utc(2000, 1, 2), TimeZone['UTC'] ) - Time.utc(2000, 1, 1)
+      assert_equal  86_400.0,  ActiveSupport::TimeWithZone.new( Time.utc(2000, 1, 2), TimeZone['Hawaii'] ) - Time.utc(2000, 1, 1)
     end
     
     def test_minus_with_time_with_zone