File_Columns with rails 2.02

I've allmost all examples you can find on the web for using file_column.
Nothing works.

The files is downloaded to the temporary library but no more.
The image field is never loaded - it's null so the picture can ofcourse
not be displayed.

I'm afraid that the examples shown is allways for an earlier version of
rails and will not work for 2.0.2.

Is there anyone that have the simplest example that work?

Thank's in advance!