Add accessors to settings class

lib/active_model/serializer/settings.rb

@@ -1,16 +1,18 @@
+require 'active_support/hash_with_indifferent_access'
+
 module ActiveModel
   class Serializer
     class Settings
       def initialize
-        @data = {}
+        @data = ActiveSupport::HashWithIndifferentAccess.new
       end
 
       def [](key)
-        @data[key.to_s]
+        @data[key]
       end
 
       def []=(key, value)
-        @data[key.to_s] = value
+        @data[key] = value
       end
 
       def each(&block)
@@ -20,6 +22,17 @@ module ActiveModel
       def clear
         @data.clear
       end
+
+      def method_missing(name, *args)
+        return @data[name] if @data.include?(name)
+        match = name.to_s.match(/(.*?)([?=]?)$/)
+        case match[2]
+        when "="
+          @data[match[1]] = args.first
+        when "?"
+          !!@data[match[1]]
+        end
+      end
     end
 
     SETTINGS = Settings.new