labeled_form_builder.rb

# Rails-FormBuilder for creating forms with <label>-Tags

class LabeledFormBuilder < ActionView::Helpers::FormBuilder
  helpers = field_helpers +
            %w{date_select datetime_select time_select} +
            %w{collection_select select country_select time_zone_select} -
            %w{radio_button hidden_field label fields_for} # Don't decorate these

  helpers.each do |name|
    define_method(name) do |field, *args|
      options = args.last.is_a?(Hash) ? args.pop : {}
      if args.last.is_a?(Hash)
        html_options = options
        options = args.pop
      else
        html_options = {}
      end
      
      # fix HTML validation error for date_select and date_time_select
      if %w(date_select datetime_select).include?(name)
        options[:id] = "#{@object_name}_#{field}_3i"
      end
      
      if options.has_key?(:label) || html_options.has_key?(:label)
        label_name = options.delete(:label) || html_options.delete(:label) 
        has_label = !label_name.blank?
      else
        label_name = nil
        has_label = true
      end
      if has_label
        label_tag = label(field, label_name, :class => options.delete(:label_class), :for => options[:id])
      else
        # human_attribute_name is used
        # Plugin required: github.com/iain/i18n_label
      end
      
      @template.content_tag(:p, label_tag.to_s + super)
    end
  end
end

ActionView::Base.default_form_builder = LabeledFormBuilder

new.haml

- form_for :debt, :url => debts_path do |f|
  = f.text :number, :label => 'Overriden label'
  = f.datetime_select :due_at
  = f.text_area :description