Edit record validation versus New record validation

I want to make sure that a field (not the primary key) in one database
table is unique. To do this I have added a custom validation
method. The code boils down to this:

[code]
if ($this->findCount("$fieldName = '$fieldValue'", -1) > 0) {
return false;
} else {
return true;
}
[/code]

While this works fine on new records, when I edit a record and try to
save it it fails because (obviously) the record already exists so the
uniqueness test fails.

The isUnique rule doesn't seem to work in all cases - seemingly in any
case.

Is there a way I can determine whether I am in update or insert 'mode'
in the model? Or perhaps someone can suggest another answer?

Rick
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