rails 3 mail gem

I have a subject from an email that comes in to my rails 3 application like this :

I trying to then save this subje开发者_如何转开发ct in my database(mongodb) as a string field using mail.subject but i get error 'String not valid UTF-8' ??

Anyone know how i solve this ?

thanks alot rick

You haven't shown any sample code, but it looks like the subject returned isn't UTF-8 encoded, but your database is. Try using force_encoding before saving the subject.

mail.subject.force_encoding("UTF-8")

EDIT:

For ruby 1.8.7, shamelessly stolen from String.force_encoding() in Ruby 1.8.7 (or Rails 2.x)

require 'iconv'
class String
  def to_my_utf8
    ::Iconv.conv('UTF-8//IGNORE', 'UTF-8', self + ' ')[0..-2]
  end
end

And then...

mail.subject.to_my_utf8