Add i18n scope to disance_of_time_in_words.

This is a backport of rails#7997.

actionpack/CHANGELOG.md

@@ -1,7 +1,8 @@
 ## Rails 3.2.10 (unreleased) ##
 
-*   Fix side effect of `url_for` changing the `:controller` string option. [Backport #6003]
+*   Add i18n scope to disance_of_time_in_words. [Backport #7997] *Steve Klabnik*
 
+*   Fix side effect of `url_for` changing the `:controller` string option. [Backport #6003]
     Before:
 
         controller = '/projects'

actionpack/lib/action_view/helpers/date_helper.rb

@@ -65,12 +65,16 @@ module DateHelper
       #   distance_of_time_in_words(Time.now, Time.now)           # => less than a minute
       #
       def distance_of_time_in_words(from_time, to_time = 0, include_seconds = false, options = {})
+        options = {
+          :scope => :'datetime.distance_in_words',
+        }.merge!(options)
+
         from_time = from_time.to_time if from_time.respond_to?(:to_time)
         to_time = to_time.to_time if to_time.respond_to?(:to_time)
         distance_in_minutes = (((to_time - from_time).abs)/60).round
         distance_in_seconds = ((to_time - from_time).abs).round
 
-        I18n.with_options :locale => options[:locale], :scope => :'datetime.distance_in_words' do |locale|
+        I18n.with_options :locale => options[:locale], :scope => options[:scope] do |locale|
           case distance_in_minutes
             when 0..1
               return distance_in_minutes == 0 ?
@@ -129,8 +133,8 @@ def distance_of_time_in_words(from_time, to_time = 0, include_seconds = false, o
       #   from_time = Time.now - 3.days - 14.minutes - 25.seconds
       #   time_ago_in_words(from_time)      # => 3 days
       #
-      def time_ago_in_words(from_time, include_seconds = false)
-        distance_of_time_in_words(from_time, Time.now, include_seconds)
+      def time_ago_in_words(from_time, include_seconds = false, options = {})
+        distance_of_time_in_words(from_time, Time.now, include_seconds, options)
       end
 
       alias_method :distance_of_time_in_words_to_now, :time_ago_in_words

actionpack/test/template/date_helper_i18n_test.rb

@@ -36,16 +36,25 @@ def test_distance_of_time_in_words_calls_i18n
     end
   end
 
-  def assert_distance_of_time_in_words_translates_key(passed, expected)
+  def test_distance_of_time_in_words_calls_i18n_with_custom_scope
+    { 
+      [30.days,             false] => [:'about_x_months',      1],
+      [60.days,             false] => [:'x_months',            2],
+    }.each do |passed, expected|
+      assert_distance_of_time_in_words_translates_key(passed, expected, {:scope => :'datetime.distance_in_words_ago'})
+    end
+  end
+
+  def assert_distance_of_time_in_words_translates_key(passed, expected, options = {})
     diff, include_seconds = *passed
     key, count = *expected
     to = @from + diff
 
-    options = {:locale => 'en', :scope => :'datetime.distance_in_words'}
+    options = {:locale => 'en', :scope => :'datetime.distance_in_words'}.merge(options)
     options[:count] = count if count
 
     I18n.expects(:t).with(key, options)
-    distance_of_time_in_words(@from, to, include_seconds, :locale => 'en')
+    distance_of_time_in_words(@from, to, include_seconds, options)
   end
 
   def test_distance_of_time_pluralizations