What is the easiest way to duplicate an activerecord record?

To get a copy, use the dup (or clone for < rails 3.1+) method:

#rails >= 3.1
new_record = old_record.dup

# rails < 3.1
new_record = old_record.clone

Then you can change whichever fields you want.

ActiveRecord overrides the built-in Object#clone to give you a new (not saved to the DB) record with an unassigned ID.
Note that it does not copy associations, so you’ll have to do this manually if you need to.

Rails 3.1 clone is a shallow copy, use dup instead…