Multiple select helper for Rails

gistfile1.rb

def multi_select(id, name, objects, selected_objects, value, content = {})
  options = ""
  objects.each do |o|
    selected = selected_objects.include?(o) ? " selected=\"selected\"" : ""
    option_value = escape_once(o.send(value))
    text = [option_value]
    unless content[:text].nil?
      text = []
      content[:text].each do |t|
        text << o.send(t)
      end
      text = text.join(" ")
    end
    bracket = []
    unless content[:bracket].nil?
      content[:bracket].each do |b|
        bracket << o.send(b)
      end
      bracket = bracket.join(" ")
    end
    option_content = bracket.empty? ? "#{text}" : "#{text} (#{bracket})"
    options << "<option value=\"#{option_value}\"#{selected}>#{option_content}</option>\n"
  end
  "<select multiple=\"multiple\" id=\"#{id}\" name=\"#{name}\">\n#{options}</select>"
end