Ruby on Rails

On 29 June 2012 03:03, kengsreng tang <lists@ruby-forum.com> wrote:
> For example:
> i have model Person
> Class Person
>  id: 1
>  name: "test"
> end
>
> this code:
> Person.name_will_change!
>
> why we need to put that above line of code?

I think these probably cover it.

http://railscasts.com/episodes/109-tracking-attribute-changes/
http://archives.ryandaigle.com/articles/2008/3/31/what-s-new-in-edge-rails-dirty-object

Colin

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