How to add max_length to allauth username

Question

I\'m using Django allauth as my user account framework for my django site. The docs show there is an ACCOUNT_USERNAME_MIN_LENGTH however there is no ACCOUNT_USERNAME_MAX_L

Answer 1

This can be quickly done by extending DefaultAccountAdapter class and overriding the clean_username method. You need to also reference the clean_username once again after our custom validation to complete other inbuilt validations.

It can be done as follows.

from allauth.account.adapter import DefaultAccountAdapter
from django.forms import ValidationError

class UsernameMaxAdapter(DefaultAccountAdapter):

    def clean_username(self, username):
        if len(username) > 'Your Max Size':
            raise ValidationError('Please enter a username value less than the current one')
        return DefaultAccountAdapter.clean_username(self,username) # For other default validations.

Finally, point to the subclass in your settings.py

ACCOUNT_ADAPTER = 'YourProject.adapter.UsernameMaxAdapter'

Reference: https://github.com/pennersr/django-allauth/blob/8fbbf8c1d32832d72de5ed1c7fd77600af57ea6f/allauth/account/adapter.py#L244