Thanks, yes, that would do the trick. Can I assume that:
def email=(address)
self[:email] = address
end
is exactly synonymous with the normal accessors rails gives us?
Particularly in regards to side effects and how it interacts with
things like attr_accessible, mass-assignment via params, and so on?
-glenn
Jordan Fowler wrote:
> 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
>>
>>
>>
>>
>
>
>
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