[PATCH] validates_length_of counts wrong size when it's non-ascii strings.

patch for validates_length_of .

1. This patch won't completely solve the issue. Code in active_record/validations.rb right above before patched lines also should be fixed:

case option         when :within, :in
          raise ArgumentError, ":#{option} must be a Range" unless option_value.is_a?(Range)

          too_short = options[:too_short] % option_value.begin
          too_long  = options[:too_long]  % option_value.end

          validates_each(attrs, options) do |record, attr, value|
            if value.nil? or value.size < option_value.begin
              record.errors.add(attr, too_short)
            elsif value.size > option_value.end
              record.errors.add(attr, too_long)
            end
          end

2. There's also in active_record/validations.rb method add_on_boundary_breaking, which also should be fixed.

3. validates_size_of (an alias of validates_length_of) is used in rails/activerecord/test/validations_test.rb: def test_validates_size_of_association , not sure how widespread and such usage is and if such overload is correct.

Thanks for comments.

I applied your comments and attachs new one.

And implemented testcase carefully.

Please check it again.

Applied comments.

I don't know how to use add_on_boundary_breaking. So I didn't fix it. But others works correctly.

(In [3654]) Fixed validates_length_of to work on UTF-8 strings by using characters instead of bytes (closes #3699) [Masao Mutoh]