find is a class method, not an instance method.
Change b = @mystuff.find(:all, :select => 'mp1') to b = Stuff.find(:all, :select => 'mp1')
Note: 'b' will be an array of ActiveRecords with only the mp1 attribute set. If you want an array of strings, add:
b = b.map{|rec| rec.mp1}
HTH, Jeffrey
Quoting Mark Preston <rails-mailing-list@andreas-s.net>: [snip]