1 files changed, 16 insertions, 3 deletions
diff --git a/activesupport/lib/active_support/multibyte/chars.rb b/activesupport/lib/active_support/multibyte/chars.rb
index 99b974e4a7..9a748dfa60 100644
--- a/activesupport/lib/active_support/multibyte/chars.rb
+++ b/activesupport/lib/active_support/multibyte/chars.rb
@@ -1,4 +1,5 @@
 # encoding: utf-8
+require 'active_support/json'
 require 'active_support/core_ext/string/access'
 require 'active_support/core_ext/string/behavior'
 require 'active_support/core_ext/module/delegation'
@@ -93,7 +94,7 @@ module ActiveSupport #:nodoc:
         chars(Unicode.unpack_graphemes(@wrapped_string).reverse.flatten.pack('U*'))
       end
 
-      # Limit the byte size of the string to a number of bytes without breaking characters. Usable
+      # Limits the byte size of the string to a number of bytes without breaking characters. Usable
       # when the storage for a string is limited for some reason.
       #
       # Example:
@@ -102,7 +103,7 @@ module ActiveSupport #:nodoc:
         slice(0...translate_offset(limit))
       end
 
-      # Convert characters in the string to uppercase.
+      # Converts characters in the string to uppercase.
       #
       # Example:
       #   'Laurent, où sont les tests ?'.mb_chars.upcase.to_s # => "LAURENT, OÙ SONT LES TESTS ?"
@@ -110,7 +111,7 @@ module ActiveSupport #:nodoc:
         chars Unicode.upcase(@wrapped_string)
       end
 
-      # Convert characters in the string to lowercase.
+      # Converts characters in the string to lowercase.
       #
       # Example:
       #   'VĚDA A VÝZKUM'.mb_chars.downcase.to_s # => "věda a výzkum"
@@ -118,6 +119,14 @@ module ActiveSupport #:nodoc:
         chars Unicode.downcase(@wrapped_string)
       end
 
+      # Converts characters in the string to the opposite case.
+      #
+      # Example:
+      #    'El Cañón".mb_chars.swapcase.to_s # => "eL cAÑÓN"
+      def swapcase
+        chars Unicode.swapcase(@wrapped_string)
+      end
+
       # Converts the first character to uppercase and the remainder to lowercase.
       #
       # Example:
@@ -180,6 +189,10 @@ module ActiveSupport #:nodoc:
         chars(Unicode.tidy_bytes(@wrapped_string, force))
       end
 
+      def as_json(options = nil) #:nodoc:
+        to_s.as_json(options)
+      end
+
       %w(capitalize downcase reverse tidy_bytes upcase).each do |method|
         define_method("#{method}!") do |*args|
           @wrapped_string = send(method, *args).to_s