How can I make a Django User email unique when a user is signing up?
forms.py
class SignUpForm(UserCreationForm): email = forms.EmailField(required=True) class Meta: model = User fields = ("username", "email", "password1", "password2") def save(self, commit=True): user = super(SignUpForm, self).save(commit=False) user.email = self.cleaned_data["email"] if commit: user.save() return user
I’m using the from django.contrib.auth.models User. Do I need to override the User in the model. Currently the model doesn’t make a reference to User.
views.py
class SignUp(generic.CreateView): form_class = SignUpForm success_url = reverse_lazy('login') template_name = 'signup.html'
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Answer
The best answer is to use CustomUser
by subclassing the AbstractUser
and put the unique email address there. For example:
from django.contrib.auth.models import AbstractUser class CustomUser(AbstractUser): email = models.EmailField(unique=True)
and update the settings with AUTH_USER_MODEL="app.CustomUser"
.
But if its not necessary for you to store the unique email in Database or maybe not use it as username field, then you can update the form’s clean
method to put a validation. For example:
from django.core.exceptions import ValidationError class YourForm(UserCreationForm): def clean(self): email = self.cleaned_data.get('email') if User.objects.filter(email=email).exists(): raise ValidationError("Email exists") return self.cleaned_data
Update
If you are in mid project, then you can follow the documentation on how to change migration, in short which is to:
- Backup you DB
- Create a custom user model identical to auth.User, call it User (so many-to-many tables keep the same name) and set db_table=’auth_user’ (so it uses the same table)
- Delete all Migrations File(except for
__init__.py
) - Delete all entry from table
django_migrations
- Create all migrations file using
python manage.py makemigrations
- Run fake migrations by
python manage.py migrate --fake
- Unset
db_table
, make other changes to the custom model, generate migrations, apply them
But if you are just starting, then delete the DB and migrations files in migration directory except for __init__.py
. Then create a new DB, create new set of migrations by python manage.py makemigrations
and apply migrations by python manage.py migrate
.
And for references in other models, you can reference them to settings.AUTH_USER_MODEL
to avoid any future problems. For example:
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.DO_NOTHING)
It will automatically reference to the current User Model.