regioes_br_checkboxes_helper.rb

REGIOES_BRASILEIRAS = {
   'Norte' => [
      ['Acre', 'AC'],
      ['Amapá','AP'],
      ['Amazonas', 'AM'],
      ['Pará', 'PA'],
      ['Rondônia', 'RO'],
      ['Roraima', 'RR'],
      ['Tocantins', 'TO']
    ],
    'Nordeste' => [
      ['Alagoas', 'AL'],
      ['Bahia', 'BA'],
      ['Ceará', 'CE'],
      ['Maranhão', 'MA'],
      ['Paraíba', 'PB'],
      ['Pernambuco', 'PE'],
      ['Piauí', 'PI'],
      ['Rio Grande do Norte', 'RN'],
      ['Sergipe', 'SE']
    ],
    'Centro-Oeste' => [
      ['Distrito Federal', 'DF'],
      ['Goiás', 'GO'],
      ['Mato Grosso', 'MT'],
      ['Mato Grosso do Sul', 'MS']
    ],
    'Sudeste' => [
      ['Espírito Santos', 'ES'],
      ['Minas Gerais', 'MG'],
      ['Rio de Janeiro', 'RJ'], 
      ['São Paulo', 'SP']
    ],
    'Sul' => [
      ['Paraná', 'PR'],
      ['Rio Grande do Sul', 'RS'],
      ['Santa Catarina', 'SC']
    ]
}.freeze unless const_defined?('REGIOES_BRASILEIRAS')

 def states_with_regions_checkboxes(object_name, method, checked = [], options = {})
   checkbox = lambda {|name, label, value, check| check_box_tag(name, value, (checked.include?(value) || check), :id => "#{object_name}_#{method}_#{value}") << label_tag("#{object_name}_#{method}_#{value}", label) }
   tokenize = lambda {|name| Iconv.new('ascii//translit', 'utf-8').iconv(name).tr(' .-', '_').downcase.gsub(/[^0-9a-z-]/, '') }
   returning "" do |html|
     REGIOES_BRASILEIRAS.each_key do |region|
       items = ""; token = tokenize.call region
       items << content_tag(:ul) do
         REGIOES_BRASILEIRAS[region].collect {|state| content_tag(:li, checkbox.call("#{object_name}[#{method}][]", state.first, state.second, false)) }
       end
       region_options = options.merge(:id => (options[:id].nil?) ? 'region_' << token : options[:id] << "_#{token}")
       states = REGIOES_BRASILEIRAS[region].collect(&:second)
       all_checked = ((checked & states).size == states.size)
       list_items = content_tag(:li, checkbox.call(token, region, token, all_checked) << items)
       html << content_tag(:ul, list_items, region_options)
     end
   end
 end