CODEWITHSUNDEEP
djangopython-3.xdjango-validation
tjati
tjati

Reputation: 6079

Subclassing RegexValidator in Django does not work

For the sake of DRY and easyness I want to inherit from Django's RegexValidator.

I tried this:

class UsernameValidator(RegexValidator):
    regex = r'^([a-zA-Z]{4}[\w]{1,16})$'
    message = 'Wrong username format.'
    code = 'invalid_format'

And I added this validator to my field this way:

class RegistrationForm(forms.Form):
    signup_username = forms.CharField(label='Username', max_length=20,
                                  validators=[UsernameValidator])

But the Validator does not fail if I use an wrong Username (like 123 or abc). What's the right way to inherit from RegexValidator?

I need this validation at several points, what's why I want an own validator for this.

Upvotes: 1

Views: 480

Answers (3)

suhain
suhain

Reputation: 186

Validators argument should be a list of callable objects In your case it should be

validators=[UsernameValidator()]

Upvotes: 0

f43d65
f43d65

Reputation: 304

Create instance of RegexValidator.

validate_username = RegexValidator(regex=r'^([a-zA-Z]{4}[\w]{1,16})$',
                                   message = 'Wrong username format.',
                                   code = 'invalid_format')

...validators = [validate_username]...

Upvotes: 1

tjati
tjati

Reputation: 6079

I wrote an own function instead of subclassing RegexValidator, and that works.

def validate_username(value):
    regex = r'^([a-zA-Z]{4}[\w]{1,16})$'
    if not re.match(regex, value):
        raise ValidationError('Wrong username format.')

Upvotes: 0

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