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

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.