gistfile1.rb

class LabeledFormBuilder < ActionView::Helpers::FormBuilder
  %w[text_field collection_select select date_select password_field
      text_area].each do |method_name|
    alias :"plain_#{method_name}" :"#{method_name}"

    # Define field helper without label
    define_method(:"#{method_name}_without_label") do |field_name, *args|
      field_content_tag(send(:"plain_#{method_name}", field_name, *args) + 
        field_error(field_name))
    end

    # Define full-blown field helper (with label and error message)
    define_method(method_name) do |field_name, *args|
      field_content_tag(field_label(field_name, *args) + super + field_error(field_name))
    end
  end
  
  alias :plain_check_box :check_box
  def check_box(field_name, *args)
    field_content_tag(super + " " + field_error(field_name) + field_label(field_name, *args),
      :class => 'form-field checkbox')
  end
  
  alias :plain_submit :submit
  def submit(*args)
    field_content_tag(super, :class => 'form-control')
  end

  def field_content_tag(content = nil, options = {})
    options.reverse_merge! :class => 'form-field'
    @template.content_tag(:div, content, options)
  end
  
  private
  
  def field_error(field_name)
    if object.errors.invalid? field_name
      @template.content_tag(:span, [object.errors.on(field_name)].flatten.first.sub(/^\^/, ''), :class => 'error_message')
    else
      ''
    end
  end
  
  def field_label(field_name, *args)
    options = args.extract_options!
    options[:label_class] = "required" if options[:required]
    label(field_name, options[:label], :class => options[:label_class])
  end

  def objectify_options(options)
    super.except(:label, :required, :label_class)
  end
end