Merge pull request #119 from c0/master

Clarification to ActiveRecord Validations Doc in 7.2 Custom Methods

guides/source/active_record_validations_callbacks.md

@@ -674,7 +674,7 @@ class Invoice < ActiveRecord::Base
     :discount_cannot_be_greater_than_total_value
 
   def expiration_date_cannot_be_in_the_past
-    if !expiration_date.blank? and expiration_date < Date.today
+    if expiration_date.present? && expiration_date < Date.today
       errors.add(:expiration_date, "can't be in the past")
     end
   end