Time#advance recognizes fractional days and weeks [#970 state:resolved]

activesupport/lib/active_support/core_ext/time/calculations.rb

@@ -98,6 +98,16 @@ def change(options)
         # <tt>:months</tt>, <tt>:weeks</tt>, <tt>:days</tt>, <tt>:hours</tt>,
         # <tt>:minutes</tt>, <tt>:seconds</tt>.
         def advance(options)
+          unless options[:weeks].nil?
+            options[:weeks], partial_weeks = options[:weeks].divmod(1)
+            options[:days] = (options[:days] || 0) + 7 * partial_weeks
+          end
+
+          unless options[:days].nil?
+            options[:days], partial_days = options[:days].divmod(1)
+            options[:hours] = (options[:hours] || 0) + 24 * partial_days
+          end
+
           d = to_date.advance(options)
           time_advanced_by_date = change(:year => d.year, :month => d.month, :day => d.day)
           seconds_to_advance = (options[:seconds] || 0) + (options[:minutes] || 0) * 60 + (options[:hours] || 0) * 3600

activesupport/test/core_ext/duration_test.rb

@@ -31,6 +31,40 @@ def test_argument_error
   end
 
   uses_mocha 'TestDurationSinceAndAgoWithCurrentTime' do
+    def test_fractional_weeks
+      Time.stubs(:now).returns Time.local(2000)
+
+      assert_in_delta((24 * 7 * 1.5).hours, 1.5.weeks, 2 ** -20)
+      assert_in_delta((24 * 7 * 1.7).hours, 1.7.weeks, 2 ** -20)
+    end
+
+    def test_fractional_days
+      Time.stubs(:now).returns Time.local(2000)
+
+      assert_in_delta((24 * 1.5).hours, 1.5.days, 2 ** -20)
+      assert_in_delta((24 * 1.7).hours, 1.7.days, 2 ** -20)
+    end
+
+    def test_since_and_ago_with_fractional_days
+      Time.stubs(:now).returns Time.local(2000)
+      # since
+      assert_equal 36.hours.since, 1.5.days.since
+      assert_equal((24 * 1.7).hours.since, 1.7.days.since)
+      # ago
+      assert_equal 36.hours.ago, 1.5.days.ago
+      assert_equal((24 * 1.7).hours.ago, 1.7.days.ago)
+    end
+
+    def test_since_and_ago_with_fractional_weeks
+      Time.stubs(:now).returns Time.local(2000)
+      # since
+      assert_equal((7 * 36).hours.since, 1.5.weeks.since)
+      assert_equal((7 * 24 * 1.7).hours.since, 1.7.weeks.since)
+      # ago
+      assert_equal((7 * 36).hours.ago, 1.5.weeks.ago)
+      assert_equal((7 * 24 * 1.7).hours.ago, 1.7.weeks.ago)
+    end
+
     def test_since_and_ago_anchored_to_time_now_when_time_zone_default_not_set
       Time.zone_default = nil
       with_env_tz 'US/Eastern' do