Rails - Jun 2008 - call_backs Is it?

Hi
   I have the models
1.ServiceDeskTicket with fields

   id --- number --- service_desk_status_id -- created_on -- updated_on
etc

2.ServiceDeskActivity  with fields

   id -- service_desk_ticket_id -- description -- created_on --
updated_on

3.ServiceDeskAttachment
   id -- service_desk_ticket_id -- attachment  -- created_on --
updated_on

     Relations as
   ServiceDeskticket has_many service_desk_activities
   ServiceDeskticket has_many service_desk_attachments
   ServiceDeskActivity belongs service_desk_ticket
   ServiceDeskAttachment belongs_to service_desk_ticket

       Now my requiremnet is whenever a new service desk activity as
well as service desk attachment is added the updated_on field of
ServiceDeskTicket is to be updated..(created_on and updated_on magic
fields of rails)..Can I set this in ServiceDeskTicket class like a
call_back..Since I am very new to rails call back functionality asking
like this..Please correct if wrong...How can I do this without rewritng
the code(I ma not asking update_attribute)..If I continue like
sd_ticket.update_attribute(''fieldname'',value)  i have to do in
all the
definitions .How can I avoid this

Thanks in advance
Sijo
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Sijo Kg wrote:
> 
>        Now my requiremnet is whenever a new service desk activity as
> well as service desk attachment is added the updated_on field of
> ServiceDeskTicket is to be updated..(created_on and updated_on magic
> fields of rails)..Can I set this in ServiceDeskTicket class like a
> call_back..Since I am very new to rails call back functionality asking
> like this..Please correct if wrong...How can I do this without rewritng
> the code(I ma not asking update_attribute)..If I continue like
> sd_ticket.update_attribute(''fieldname'',value)  i have to
do in all the
> definitions .How can I avoid this
> 
> Thanks in advance
> Sijo
Your callbacks should go in the class that triggers the actions when it 
is saved.  eg

#in service_desk_activity.rb
before_save :update_ticket

def update_ticket
  self.service_desk_ticket.save
end

because you''re using the magic timestamps, just saving the associated 
ticket object should update updated_at correctly.  You can use the same 
code in the ''attachment'' class as well i think.
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Hi
     Thanks for your reply.
Sijo
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