You can freeze Show archive.org snapshot any Ruby object to prevent further modification.

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If you freeze an ActiveRecord and try to set an attribute you will an error like this:

can't modify frozen hash

This is because ActiveRecord delegates #freeze to its attributes hash.

You can unfreeze most Ruby objects by creating a shallow copy of the frozen object by calling #dup on it:

user = User.find(3)
user.freeze
unfrozen_user = user.dup

Notes for Rails 2 users

There is a bug in Rails 2.3.x where duping an ActiveRecord instance doesn't dup its attributes hash. Hence, you cannot unfreeze the object with dup.

Use the attached initializer to fix that.