How to make email field unique in model User from contrib.auth in Django

Question

I need to patch the standard User model of contrib.auth by ensuring the email field entry is unique:

User._meta.fields[4].unique = True
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Answer 1

Your form should look something like this.

def clean_email(self):
    email = self.cleaned_data.get('email')
    username = self.cleaned_data.get('username')
    print User.objects.filter(email=email).count()
    if email and User.objects.filter(email=email).count() > 0:
        raise forms.ValidationError(u'This email address is already registered.')
    return email

Answer 2

The first answer here is working for me when I'm creating new users, but it fails when I try to edit a user, since I am excluding the username from the view. Is there a simple edit for this that will make the check independent of the username field?

I also tried including the username field as a hidden field (since I don't want people to edit it), but that failed too because django was checking for duplicate usernames in the system.

(sorry this is posted as an answer, but I lack the creds to post it as a comment. Not sure I understand Stackoverflow's logic on that.)

Answer 3

from an User inherited model, redefine the attribute correctly. It should work, as is it's not usefull to have that in django core because it's simple to do.

Answer 4

Since version 1.2 (May 11th, 2015) there has been a way to dynamically import any chosen registration form using the settings option REGISTRATION_FORM.

So, one could use something like this:

REGISTRATION_FORM = 'registration.forms.RegistrationFormUniqueEmail'

This is documented here.

And here's the link to the changelog entry.

Answer 5

Add the below function in any of the models.py file. Then run makemigrations and migrate. Tested on Django1.7

def set_email_as_unique():
    """
    Sets the email field as unique=True in auth.User Model
    """
    email_field = dict([(field.name, field) for field in MyUser._meta.fields])["email"]
    setattr(email_field, '_unique', True)

#this is called here so that attribute can be set at the application load time
set_email_as_unique()

Answer 6

Django has a Full Example on its documentation on how to substitute and use a Custom User Model, so you can add fields and use email as username.