automatic string trimming on ActiveRecord save

Howdy.

Is there an easy way to get ActiveRecord to trim/strip spaces off
strings before inserting them into the database?

I can't think of a good reason that one would want trailing spaces to
persist in string database columns. I know I can iterate through all
my class members and strip them before the save, but that seems like
comparatively low level work considering the high level feel of
ActiveRecord. (It makes me suspect there's a better way)

Thanks,
Michael