require 'fastercsv'
csv_string = FasterCSV.generate do |csv|
csv << ['admission_no','student_name','contact_no']
student = Student.find(:all)
student.each do |r|
csv << [r.admission_no,r.student_name,r.contact_no']
end
end
send_data csv_string,
:type => 'text/csv; charset=iso-8859-1; header=present',
:disposition => "attachment; filename=student.csv"
Good luck. :)
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