Changeset 8250

Timestamp:

12/01/07 23:12:49 (2 years ago)

Author:

nzkoz

Message:

Warn users about the race condition in validates_uniqueness_of. [Koz]

Files:

• trunk/activerecord/lib/active_record/validations.rb (modified) (1 diff)

trunk/activerecord/lib/active_record/validations.rb

@@ -596 +596 @@
-      # attribute (that maps to a column). When the record is updated, the same check is made but disregarding the record itself.
-      #
+      # Because this check is performed outside the database there is still a chance that duplicate values
+      # will be inserted in two parrallel transactions.  To guarantee against this you should create a 
+      # unique index on the field. See +create_index+ for more information.
+      #
-      # Configuration options:
-      # * <tt>message</tt> - Specifies a custom error message (default is: "has already been taken")