rails 导出数据为csv格式以及编码格式的转换

def convert(str)
require 'iconv'
begin
converter = Iconv.new("GB2312", "UTF-8")
converter.iconv(str)
rescue
str
end
end

def csv_export
@trains = TrainsUser.find(:all)

csv_string = FasterCSV.generate do |csv|
csv << [convert("内容名称"),convert("公司名"),convert("学习时间")]
@trains.each do |u|
if u.train && u.user
csv << [convert(u.train.name),convert(u.user.company_name),u.created_at.strftime("%Y-%m-%d %H:%M")]
end
end
end
send_data csv_string,
:type => 'text/csv; charset=utf-8; header=present',
:disposition => "attachment; filename=#{Time.now.strftime("%Y%m%d%H%M")}_export.csv"
end