Hai provato con la StringIO ?
result = StringIO.new
result << %(<table>)
(9..19).each do |hour|
result << %(<tr>)
(0..6).each do |day|
result << %(<td>#{ get_event(day, hour) }</td>)
end
result << %(</tr>)
end
result << %(</table>)
result.rewind
<%= result.read %>
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