Change username max_length in Django 1.11 (django.contrib.auth)

Question

My users are using e-mail addresses as usernames, which caused a problem in Django 1.9 because there was a 30 character maximum username length.

This was supposed to be fixed by Django 1.10, with a 150 character limit, I believe (though it looks like the docs actually say that max_length should be able to go up to 191 characters for certain databases).

I upgraded to Django 1.11 but username still seems to be limited to 30 characters. Is it because I need to set the value of max_length somewhere? If so, where do I set this (an example would be great)? If not, how do I increase the max length?

Here is my current view.

def register(request): alreadyRegistered = False invalidID = False context_dict = {} if request.method == 'POST': # Gather the username and password provided by the user. # This information is obtained from the login form. Userid = request.POST['username'] Userid = Userid[0:29] # horrible work-around that has to change if User.objects.filter(username=Userid).count() > 0: alreadyRegistered = True else: isGU = 1 > 0 # this will always = TRUE for now if isGU or isEA: firstname = request.POST['firstname'] lastname = request.POST['lastname'] email = Userid password = request.POST['password'] user = User.objects.create_user(Userid, email, password) user.first_name = firstname user.last_name = lastname user.save() registered = True user = authenticate(username=Userid, password=password) login(request, user) return HttpResponseRedirect('/studentprogress/') else: invalidID = True context_dict['alreadyRegistered'] = alreadyRegistered context_dict['invalidID'] = invalidID return render(request, 'studentprogress/register.html', context_dict)

Possible duplicate of Override default django username validators for AbstractUser model — Javier Campos
– Javier Campos, Commented Jun 7, 2017 at 20:16
I think this is a duplicate, maybe look here stackoverflow.com/questions/29921900/… — Javier Campos
– Javier Campos, Commented Jun 7, 2017 at 20:17
So I have to create a new user model and then use that and override the length there basically? — Hack-R
– Hack-R, Commented Jun 7, 2017 at 20:20

Pettis · Accepted Answer · 2017-06-07 23:20:02Z

One way to allow custom length of username field is to use custom user model. The documentation is here: https://docs.djangoproject.com/en/1.11/topics/auth/customizing/#specifying-a-custom-user-model

Extend your custom user model from AbstractBaseUser which provides necessary methods to work with Django authentication.

Basically you can just create the model with data you need to have and define the required fields in the model. In your case you might want to set the USERNAME_FIELD and EMAIL_FIELD to be the same field in model.

Jeff · Accepted Answer · 2019-10-17 15:41:13Z

Django 1.10 shipped with a migration to alter the username max_length. You just have to run migrations i.e. python manage.py migrate auth to update your database tables.

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