Use respond_to_missing? for Chars

2 files changed, 11 insertions, 2 deletions

diff --git a/activesupport/lib/active_support/multibyte/chars.rb b/activesupport/lib/active_support/multibyte/chars.rb
index 9a748dfa60..b20c980f36 100644
--- a/activesupport/lib/active_support/multibyte/chars.rb
+++ b/activesupport/lib/active_support/multibyte/chars.rb
@@ -62,8 +62,8 @@ module ActiveSupport #:nodoc:
 
       # Returns +true+ if _obj_ responds to the given method. Private methods are included in the search
       # only if the optional second parameter evaluates to +true+.
-      def respond_to?(method, include_private=false)
-        super || @wrapped_string.respond_to?(method, include_private)
+      def respond_to_missing?(method, include_private)
+        @wrapped_string.respond_to?(method, include_private)
       end
 
       # Returns +true+ when the proxy class can handle the string. Returns +false+ otherwise.
diff --git a/activesupport/test/multibyte_chars_test.rb b/activesupport/test/multibyte_chars_test.rb
index 90aa13b3e6..a8d69d0ec3 100644
--- a/activesupport/test/multibyte_chars_test.rb
+++ b/activesupport/test/multibyte_chars_test.rb
@@ -458,6 +458,15 @@ class MultibyteCharsUTF8BehaviourTest < ActiveSupport::TestCase
     assert !''.mb_chars.respond_to?(:undefined_method) # Not defined
   end
 
+  def test_method_works_for_proxyed_methods
+    assert_equal 'll', 'hello'.mb_chars.method(:slice).call(2..3) # Defined on Chars
+    chars = 'hello'.mb_chars
+    assert_equal 'Hello', chars.method(:capitalize!).call # Defined on Chars
+    assert_equal 'Hello', chars
+    assert_equal 'jello', 'hello'.mb_chars.method(:gsub).call(/h/, 'j') # Defined on String
+    assert_raise(NameError){ ''.mb_chars.method(:undefined_method) } # Not defined
+  end
+
   def test_acts_like_string
     assert 'Bambi'.mb_chars.acts_like_string?
   end