ruby on rails 3.2 - How to (with a mailer-observer) delete a temporary (generated attachement) file after the e-mail has been sent? -

i'm sending e-mails user attachment (report) file automatically generated of actionmailer.

this app/mailer/report_mailer.rb :

class reportmailer < actionmailer::base   default from: "server.email@my_domaine.com"    def generated_report(user, file_name, report_name, file_path)     @user = user     @report_name = report_name     attachments[file_name] = file.read(file_path)     mail(:to => user.email, :subject => "generated report #{report_name} (automatic message)")   end end 

called controller :

...   t = time.now   file_name = "#{generated_name}_#{t.strftime("%y-%m-%d_%hh-%m-%ssec")}_#{t.usec}.xls"   file_path = '/tmp/' + file_name   reportmailer.generated_report(current_user, file_name, generated_name, file_path).deliver ... 

my app/models/generated_report_observer.rb :

class generatedreportobserver < activerecord::observer    def self.delivered_email(message)     file_path = ????     file.delete file_path if file.exist? file_path   end end 

the initialization of observer mailer in config/initilizer/my_mailer_observer_initializer.rb :

reportmailer.register_observer(generatedreportobserver) 

thanks help

i' managed find correct instruction afrer digging deep rails library :

so end following app/models/generated_report_observer.rb :

class generatedreportobserver < activerecord::observer    def self.delivered_email(message)     file_path = '/tmp/' + message.attachments[0].filename     file.delete file_path if file.exist? file_path   end end