Rails - Sep 2008 - Updating timestamp when adding model via association

What''s the proper way to update a models timestamp when you add an
object to one of it''s associations?

For example, if I have a model, Business, that has_many :addresses,
when I add a new Address, I''d like the updated_at timestamp for the
business object to get updated.

Doing:

@business.addresses.create(....)

Does not update the updated_at timestamp for @business. What''s the
best way to get it to update?

Thank you,
Kenny

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On Sep 19, 5:11 pm, Kenny
<kennycarruth...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> What''s the proper way to update a models timestamp when you add an
> object to one of it''s associations?
>
> For example, if I have a model, Business, that has_many :addresses,
> when I add a new Address, I''d like the updated_at timestamp for
the
> business object to get updated.
>
> Doing:
>
> @business.addresses.create(....)
>
> Does not update the updated_at timestamp for @business. What''s the
> best way to get it to update?
>
> Thank you,
> Kenny
If you''re using Rails 2.1 and have ActiveRecord::Base.partial_updates
= true, you can try this:

class Address
  belongs_to :business
  before_save :update_business
  private
    def update_business
      if self.business && self.business_id_changed?
        self.business.updated_at = Time.now
      end
end
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