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class Array
def to_xls(options = {})
output = '<?xml version="1.0" encoding="UTF-8"?><Workbook 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" xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office"><Worksheet ss:Name="Sheet1"><Table>'
if self.any?
klass = self.first.class
attributes = self.first.attributes.keys.sort.map(&:to_sym)
if options[:only]
columns = Array(options[:only]) & attributes
else
columns = attributes - Array(options[:except])
end
columns += Array(options[:methods])
if columns.any?
unless options[:headers] == false
output << "<Row>"
columns.each { |column| output << "<Cell><Data ss:Type=\"String\">#{klass.human_attribute_name(column)}</Data></Cell>" }
output << "</Row>"
end
self.each do |item|
output << "<Row>"
columns.each do |column|
value = item.send(column)
output << "<Cell><Data ss:Type=\"#{value.is_a?(Integer) ? 'Number' : 'String'}\">#{value}</Data></Cell>"
end
output << "</Row>"
end
end
end
output << '</Table></Worksheet></Workbook>'
end
end