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
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