IntegrityError with Charfield and option unique=True

[anonymous]

I have this model :

class Group(models.Model):
    idGroup = models.AutoField(primary_key=True)
    name = models.CharField('Name', max_length=50, unique=True)

In django admin interface when i add a Group with the same name of other Group I obtain the error

Exception Type: IntegrityError
Exception Value: (1062, "Duplicate entry 'xxxx' for key 2")

How can i have a regular validation error in admin interface ?

PS : I use Mysql with InnoDB

Thanks in advance

[Karen Tracey]

What version of Django are you using? Cut-and-pasting your model into a project and running with a current level results in admin rejecting the duplicate add with a message "Group with this Name already exists." This unique validation was added in r8805 (which was prior to 1.0). It sounds like you are running something earlier than that.