Merge pull request rails#8791 from griffinmyers/master

Updated DirtyModel's @changed_attributes hash to be symbol/string agnostic

Conflicts:
	activemodel/CHANGELOG.md

activemodel/CHANGELOG.md

@@ -1,3 +1,8 @@
+*   Updated the `ActiveModel::Dirty#changed_attributes` method to be indifferent between using
+    symbols and strings as keys.
+
+    *William Myers*
+
 *   Added new API methods `reset_changes` and `changed_applied` to `ActiveModel::Dirty`
     that control changes state. Previsously you needed to update internal
     instance variables, but now API methods are available.

activemodel/lib/active_model/dirty.rb

@@ -145,7 +145,7 @@ def previous_changes
     #   person.name = 'robert'
     #   person.changed_attributes # => {"name" => "bob"}
     def changed_attributes
-      @changed_attributes ||= {}
+      @changed_attributes ||= ActiveSupport::HashWithIndifferentAccess.new
     end
 
     # Handle <tt>*_changed?</tt> for +method_missing+.

activemodel/test/cases/dirty_test.rb

@@ -3,11 +3,12 @@
 class DirtyTest < ActiveModel::TestCase
   class DirtyModel
     include ActiveModel::Dirty
-    define_attribute_methods :name, :color
+    define_attribute_methods :name, :color, :size
 
     def initialize
       @name = nil
       @color = nil
+      @size = nil
     end
 
     def name
@@ -28,6 +29,15 @@ def color=(val)
       @color = val
     end
 
+    def size
+      @size
+    end
+
+    def size=(val)
+      attribute_will_change!(:size) unless val == @size
+      @size = val
+    end
+
     def save
       changes_applied
     end
@@ -124,4 +134,9 @@ def save
     assert_equal ["Otto", "Mr. Manfredgensonton"], @model.name_change
     assert_equal @model.name_was, "Otto"
   end
+
+  test "using attribute_will_change! with a symbol" do
+    @model.size = 1
+    assert @model.size_changed?
+  end
 end