Rails: multi select control with multiple items pre selected

controller snippet

  def edit
    @publication = Publication.find(params[:id])
    @recipients = @publication.users
  end

form view snippet

# ???? is there a way to duplicate this behavior with a rails helper?
# --------------------------------------------------------------------
<select id='recipients_id' multiple='multiple' name='recipients[id][]'>
  <% User.all.each do |u| %>
    <option value='<%= u.id %>'
      <%= @recipients.include?(u) ? "selected='selected'" : '' %> ><%= u.name %></option>
  <% end %>
</select>