Hi Glenn,
1. Your rationale is reasonable, considering you may want to work with
the new obj.email before saving
2. Use the write_attribute or the []= synonym to set the actual field
value, example below:
def email=(address)
self[:email] = address
if self.changed.member?("email")
self.email_last_sent = nil
end
end
Hope this helps.
-Jordan
On Wed, Nov 12, 2008 at 12:21 PM, Glenn Little <[EMAIL PROTECTED]> wrote:
>
> I have a situation where I'd like a change to an AR object's
> attribute to conditionally cause another attribute change.
>
> For instance, class Person has attributes
>
> varchar name
> varchar email
> datetime email_last_sent
>
> If the person's email address changes, I want to zero-out the
> email_last_sent date.
>
> I can think of two places to do this: a before_save filter, or
> in the actual "email=" accessor. I'd prefer to use the
> accessor, since if I use before_save, my objects will be "incorrect"
> until I do a save()
>
> Two questions:
>
> 1) is my rationale regarding not wanting to use a before_save filter
> reasonable?
>
> 2) I can't figure out how to create a modified accessor that basically
> wraps the normal ActiveRecord-provided accessor. I want something
> like:
>
> def email=(address)
> ar_supplied_email= (address)
> if self.changed.member?("email") # or any other way of knowing if it
> changed
> self.email_last_sent = nil
> end
> end
>
> But how do I get at "ar_supplied_email="? I tried it with "self.email="
> but that not too surprisingly overflowed the stack :-)
>
> Thanks!
>
> -glenn
>
>
>
>
> >
>
--
Jordan A. Fowler
2621 First Ave Apt 5
San Diego, CA 92103
E-mail: [EMAIL PROTECTED]
Website: http://www.jordanfowler.com
Phone: (619) 339-6752
--~--~---------~--~----~------------~-------~--~----~
SD Ruby mailing list
[email protected]
http://groups.google.com/group/sdruby
-~----------~----~----~----~------~----~------~--~---
