Rails validator for counting newlines as one character

gistfile1.rb

# Browsers send newlines from textareas as "\r\n", thus each newline is counted
# as two chars when using Rails’ default LengthValidator.
#
# Of course it would also be possible to convert "\r\n" to "\n" in the controller 
# or model, but in my app it’s simpler do use a custom validator.
class LengthCountingNewlinesAsOneValidator < ActiveModel::Validations::LengthValidator
  def validate_each(record, attribute, value)
    value = value.gsub("\r\n", "\n")
    super
  end
end