diff --git a/app/models/customer_appointment.rb b/app/models/customer_appointment.rb
index 3209c6f..88a9eb0 100644
--- a/app/models/customer_appointment.rb
+++ b/app/models/customer_appointment.rb
@@ -43,6 +43,10 @@ class CustomerAppointment < ActiveRecord::Base
     return CustomerAppointment.all
   end
 
+  def to_s
+    subject
+  end
+
   private
 
   def log(msg)