curl -O http://celebnamer.celebworld.ws/stuff/mod_xsendfile/mod_xsendfile.c
apxs2 -cia mod_xsendfile.c

apt-get install apache2-prefork-dev

LoadModule xsendfile_module /usr/lib/apache2/modules/mod_xsendfile.so

XSendFile on
XSendFileAllowAbove on

response.headers['Content-Type'] = "application/force-download"
response.headers['Content-Disposition'] = "attachment; filename=\"#{filename}\""
response.headers["X-Sendfile"] = local_file
response.headers['Content-length'] = File.size(local_file)
response.headers['Cache-Control'] = 'must-revalidate'
render :nothing => true

a = Attachment.find(params[:id])
a.hit!
if @request.env["HTTP_USER_AGENT"] =~ /IE/
  filename = Iconv.iconv('euckr', 'utf8', a.original_filename)
else
  filename = a.original_filename
end
# send_file(File.join(UPLOAD_DIR, a.id.to_s), :filename => filename, :type => a.content_type)
local_file = File.join(RAILS_ROOT, UPLOAD_DIR, a.id.to_s)
response.headers['Content-Type'] = "application/force-download"
response.headers['Content-Disposition'] = "attachment; filename=\"#{filename}\""
response.headers["X-Sendfile"] = local_file
response.headers['Content-length'] = File.size(local_file)
response.headers['Cache-Control'] = 'must-revalidate'
render :nothing => true

class TodoList < ActiveRecord::Base
has_many :todo_items, :order => "position"
end

class TodoItem < ActiveRecord::Base
belongs_to :todo_list
acts_as_list :scope => :todo_list
end

class Board < ActiveRecord::Base
  acts_as_list :scope => 'category = \'#{category}\''
end

has_many :boards, :conditions => 'id = #{special_id}'

sudo gem update -y

rake rails:update