JSON encoding wrongly escaped (Rails 3, Ruby 1.9.2)

Question

In my controller, the following works (prints \"oké\")

puts obj.inspect

But this doesn\'t (renders \"ok\\u00e9\")

render :j         


        

Answer 1

You can prevent it by monkey patching the method mentioned by muu is too short. Put the following into config/initializers/patches.rb (or similar file used for patching stuff) and restart your rails process for the change to take affect.

module ActiveSupport::JSON::Encoding
  class << self
    def escape(string)
      if string.respond_to?(:force_encoding)
        string = string.encode(::Encoding::UTF_8, :undef => :replace).force_encoding(::Encoding::BINARY)
      end
      json = string.gsub(escape_regex) { |s| ESCAPED_CHARS[s] }
      json = %("#{json}")
      json.force_encoding(::Encoding::UTF_8) if json.respond_to?(:force_encoding)
      json
    end
  end
end

Be adviced that there's no guarantee that the patch will work with future versions of ActiveSupport. The version used when writing this post is 3.1.3.