Ajax in Rails View with X-CSRF-Token

foo.html.erb

<%= check_box_tag "foo[delivered]", nil, foo.delivered, data: { id: foo.id }, class: "delivered" %>

<script type="text/javascript">

    $.ajaxSetup({
      headers: { 'X-CSRF-Token': '<%= form_authenticity_token.to_s %>' },
      timeout: 30000, // timeout after 30 seconds
      async: true,
      cache: false,
      // dataType: "json", // The type of data that you're expecting back from the server
    });
    
    $(document).on( "change", ".delivered", function() {
        var sendData = { id: $(this).data('id'), delivered: $(this).prop('checked')};
        $.ajax({
            type: 'PATCH',
            url: '<%= ajax_path %>',
            data: sendData,
        }).done( function (data, status) {
            return true;
        }).fail( function (data, status) {
            alert("update server error: " + data.status + ' ' + data.statusText + '\n' + data.responseText);
            return false;
        });
    });
    
</script>