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unescaping javascript in rails .rb file / returning js in ruby methods
%Q{<script type="text/javascript">
    $(function() {
        $('#{table_dom_id}').dataTable({
          "oLanguage": {
            "sSearch": "#{search_label}",
            #{"'sZeroRecords': '#{no_records_message}'," if no_records_message}
            "sProcessing": '#{processing}'
          },
          "sPaginationType": "full_numbers",
          "iDisplayLength": #{per_page},
          "bProcessing": true,
          "bServerSide": #{server_side},
          "bLengthChange": false,
          "bStateSave": #{persist_state},
          "bFilter": #{search},
          "bAutoWidth": #{auto_width},
          #{"'aaSorting': [#{sort_by}]," if sort_by}
          #{"'sAjaxSource': '#{ajax_source}'," if ajax_source}
          "aoColumns": [
                #{formatted_columns(columns)}
                    ],
            #{"'fnRowCallback': function( nRow, aData, iDisplayIndex ) { #{row_callback} }," if row_callback}
          "fnServerData": function ( sSource, aoData, fnCallback ) {
            aoData.push( #{additional_data_string} );
            $.getJSON( sSource, aoData, function (json) {
                    fnCallback(json);
                } );
          }
        })#{append};
    });
    </script>}

# Provided that my_escaped_string is what you want to display
<%= my_escaped_string.html_safe %>
<%= raw my_escaped_string %>