Merge pull request #18610 from amatsuda/privatize_config_accessor

config_accessor should better not be a public method, as with Ruby's attr_accessor

activesupport/CHANGELOG.md

+*   config_accessor became a private method, as with Ruby's attr_accessor.
+
+    *Akira Matsuda*
+
 *   `AS::Testing::TimeHelpers#travel_to` now changes `DateTime.now` as well as
     `Time.now` and `Date.today`.
 

activesupport/lib/active_support/configurable.rb

@@ -122,6 +122,7 @@ def config_accessor(*names)
           send("#{name}=", yield) if block_given?
         end
       end
+      private :config_accessor
     end
 
     # Reads and writes attributes from a configuration <tt>OrderedHash</tt>.

activesupport/test/configurable_test.rb

@@ -111,6 +111,14 @@ class Child < Parent
     end
   end
 
+  test 'the config_accessor method should not be publicly callable' do
+    assert_raises NoMethodError do
+      Class.new {
+        include ActiveSupport::Configurable
+      }.config_accessor :foo
+    end
+  end
+
   def assert_method_defined(object, method)
     methods = object.public_methods.map(&:to_s)
     assert methods.include?(method.to_s), "Expected #{methods.inspect} to include #{method.to_s.inspect}"