app/views/admin/cases/index.xls.erb
<?xml version="1.0"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:html="http://www.w3.org/TR/REC-html40">
<Worksheet ss:Name="Sheet1">
<Table>
<Row>
<Cell><Data ss:Type="String">User</Data></Cell>
<Cell><Data ss:Type="String">Case Type</Cell>
<Cell><Data ss:Type="String">Status</Data></Cell>
<Cell><Data ss:Type="String">Issues</Data></Cell>
</Row>
<% @case_files.each do |casefile| %>
<Row>
<Cell><Data ss:Type="Number"><%= casefile.user.name%></Data></Cell>
<Cell><Data ss:Type="String"><%= casefile.case_type%></Data></Cell>
<Cell><Data ss:Type="String"><%= casefile.status %></Data></Cell>
<Cell><Data ss:Type="Number"><%= casefile.issues.collect { |i| i.tag.name }.to_sentence %></Data></Cell>
</Row>
<% end %>
</Table>
</Worksheet>
</Workbook>