question about exception

rubyonrails-talk
1

Hi    In the controller I have the function

   def convert_sd_ticket_to_incident     ServiceDeskTicket.close_ticket(sd_id,created_by_id,modified_by_id)     Incident.convert_sd_ticket_to_incident(sd_id,created_by_id,modified_by_id)    end

  Now in the ServiceDeskTicket model   def self.close_ticket(sd_id,created_by,modified_by)     begin       ActiveRecord::Base.transaction do         sd_ticket=self.find(sd_id) sd_ticket.service_desk_status_histories.add_status_histories_on_convert_to_incident(sd_ticket.id,sd_ticket.service_desk_status_id,created_by,modified_by)         sd_ticket.update_attributes!(:service_desk_status_id => 7 )         code continues       end       rescue Exception => e:           puts 'error is '+e.to_s     end   end

    Now my problem is this ServiceDeskTicket has a validation validates_presence_of :description       It is only implemented now and there are some records in the db which have no description..So suppose if I tries to convert any such record to an incident what happens is the above code in the model ServiceDeskTicket rollsback since it gets exception that description empty...But what happens now is in the controller code above the rest ie Incident.convert_sd_ticket_to_incident(sd_id,created_by_id,modified_by_id)     which is executed (this code converts the ticket to incident)          The solution which i am searching is how can I handle (get) the above exception that is happening in the model in the controller and redirect to the same page saying that "Please give a description first"       I know I can restrict the Incident being added to check whether the return value of    ServiceDeskTicket.close_ticket(sd_id,created_by_id,modified_by_id) is true      But how can I handle this.Please help

Sijo

2

If you need to notify the user of error, the best way is using flash (in the controller). For instance, in the rescue part of that last function do something like this:

rescue Exception => e   flash[:error] = e.to_s   redirect :controller => ... , :action => ... end

And in the view of the page you are redirecting to, make sure you have a reserved space to show flash messages like so:

<p class='error'><%= flash[:error] -%></p>

Hope it was of help.