Improving check-in process

mark user as present for the conference when user's registration ticket for that conference is scanned

app/models/ticket_scanning.rb

@@ -1,3 +1,13 @@
 class TicketScanning < ActiveRecord::Base
   belongs_to :physical_ticket
+
+  before_create :mark_user_present
+
+  private
+
+  def mark_user_present
+    if physical_ticket.ticket.registration_ticket?
+      physical_ticket.user.mark_attendance_for_conference(physical_ticket.conference)
+    end
+  end
 end