ActiveRecord after save new and old values

Rails
1

I want to write a function that after an ActiveRecord saves
successfully, can show me what the before and after values of a
particular column are. Is this possible without creating a separate
object before modifying the current one?

-John

2

Hi John,

Have a look at callback methods and observer classes. The following is
an example of using callback methods. Have a look at the modules
ActiveRecord::Callbacks and ActiveRecord::Observer on
http://api.rubyonrails.org/ for a full description of what is possible

class Foo
before_save :collect_before_values
after_save : collect_after_values

def collect_before_values
# …
end

def collect_after_values
# …
end
end

Hope that helps!

cheers
Martin

3

Doh, of course the class definition should look like

class Foo < ActiveRecord::Base

…

end

cheers
Martin

4

Thanks,

That’s exactly what I wanted.

-John

On Thu, May 18, 2006 at 07:10:30PM +0200, Martin G. wrote:

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John O.
Systems Administrator
Yo!Africa
E-Mail: john at yoafrica.com
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