Simple_form scaffold erb template file for Bootstrap

_form.html.erb

<%%= simple_form_for(@<%= singular_table_name %>) do |f| %>
  <%%= f.error_notification %>

  <%- attributes.each do |attribute| -%>
    <div class="form-group">
      <%%= f.<%= attribute.reference? ? :association : :input %> :<%= attribute.name %>, input_html: { class: 'form-control' } %>
    </div>
  <%- end -%>

  <div class="form-actions">
    <%%= f.button :submit, class: 'btn btn-default' %>
  </div>
<%% end %>