New Forms + Validation

I have a form where a user needs to enter a 8 digit code.  
I want to
check the user's input against a database and return an
error if the
code has already been entered by another user.

 If I use New Forms,  do I need to write a custom Field to
do this
validation?
Any pointers would be appreciated.

Many thanks

MerMer


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On Jan 31, 1:19 pm, "MerMer" <merr...googlemail.com> wrote:
> I have a form where a user needs to enter a 8 digit
code.   I want to
> check the user's input against a database and return an
error if the
> code has already been entered by another user.
>
>  If I use New Forms,  do I need to write a custom Field
to do this
> validation?

No, just implement your clean_YOURFIELDNAME method of the
form.

class Person(Form):
... (fields declaration follow)

    def clean_student_seniority(self):
        if (self.clean_data.get("person_type") ==
1) and
(self.clean_data.get("student_seniority") ==
None):
            raise ValidationError(u"Students must have
a seniority
defined")

        return
self.clean_data["student_seniority"]

Then in your view you check if form.is_valid()

Lorenzo


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