exclude column from activerecord

i'd like to exclude columns from my model.
i read some messages about it but nothing fits me. i found this one
which seems to be great :
http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/d3a0ae301c7063b2/71c9056b73c606dc?lnk=gst&q=ignore+column#71c9056b73c606dc

but the problem is that active record skip select when "include"
parameter is used. is there another solution?