How create zip file using rubyzip on heroku - ruby-on-rails-3

Question

I am working with creating zip file after read users cv's. Code is working fine on local machine. But there is error when deploy this code on heroku.
def get_stream(contractors)
#t = Tempfile.new("my-temp-filename-#{Time.now}") #this code on local
t = Tempfile.new("#{Rails.root}/tmp/my-temp-filename-#{Time.now}") #this line on heroku break
begin
Zip::OutputStream.open(t.path) do |zos|
contractors.each_with_index do |contractor, index|
if contractor.cv.path
zos.put_next_entry("#{index+1}_#{contractor.full_name.parameterize.underscore}.#{contractor.cv_file_name.split(".").last}")
zos.print IO.read(contractor.cv.path)
end
end
end
send_file t.path, :type => 'application/zip', :filename => "Contractors_cvs.zip", :x_sendfile => true
t.close
rescue
t.close
end
end
while heroku logs --app just show me "Completed 500 Internal Server Error in 56ms"
Any help please.
Thanks

Answer 1

Finally this works for me on both local and heroku.
def get_stream(contractors)
begin
Zip::File.open("#{Rails.root}/tmp/zipfile_name.zip", Zip::File::CREATE) do |zipfile|
contractors.each_with_index do |filename, index|
zipfile.add(filename.try(:cv_file_name), filename.try(:cv).try(:path)) if filename.present?
end
end
send_file "#{Rails.root}/tmp/zipfile_name.zip", :type => 'application/zip', :filename => "Contractor_cvs.zip", :x_sendfile => true
File.delete("#{Rails.root}/tmp/zipfile_name.zip")
rescue
end
end