app/views/books/_associated_record.html.haml
.input-group.associated-item
= form.input :name, required: false, label: '', as: :string, input_html: { class: 'input-xxlarge' }
%span.input-group-btn
%button.btn.btn-default.btn-xs.remove-field{type: "button", data: { objecttype: object_type }} Remove