A sample Rails form definition

_form.html.haml

= simple_form_for([:admin, @event]) do |f|
  = f.error_notification

  .form-inputs
    = f.input :is_active

    = f.input :name_en, label: 'Name (in English)', input_html: { class: 'input-xxlarge' }
    = f.input :name_cn, label: 'Name (in Chinese)', input_html: { class: 'input-xxlarge' }

    = f.input :category_id, as: :hidden

    = f.input :address_en, as: :text, label: 'Address (in English)', input_html: { class: 'input-xxlarge', rows: 2 }
    = f.input :address_cn, as: :text, label: 'Address (in Chinese)', input_html: { class: 'input-xxlarge', rows: 2 }

  .form-actions
    = f.button :submit, class: "btn btn-primary"