Django auth.user with unique email

问题

I use the django.auth system and I've this:

class RegisterForm(UserCreationForm):
    username = forms.RegexField(label= "Username" , max_length = 30, regex = r'^[\w]+$', error_messages = {'invalid': "This value may contain only letters, numbers and _ characters."})
    email = forms.EmailField(label = "Email")
    first_name = forms.CharField(label = "First name", required = False)
    last_name = forms.CharField(label = "Last name", required = False)

    class Meta:
        model = User
        fields = ("username", "first_name", "last_name", "email", )

    def save(self, commit = True):
        user = super(RegisterForm, self).save(commit = False)
        user.first_name = self.cleaned_data["first_name"]
        user.last_name = self.cleaned_data["last_name"]
        user.email = self.cleaned_data["email"]
        if commit:
            user.save()
        return user

I want to set emails as uniques and check the form for this validation. How can I do it?

回答1:

add this to your form. But this isn't perfect way. race condition is available by only using this form. I recommend you to add unique constraint at db level.

def clean_email(self):
    data = self.cleaned_data['email']
    if User.objects.filter(email=data).exists():
        raise forms.ValidationError("This email already used")
    return data

SQL to add unique constraint:

ALTER TABLE auth_user ADD UNIQUE (email)

回答2:

Somewhere in your models:

from django.contrib.auth.models import User
User._meta.get_field('email')._unique = True

Notice the underscore before unique. This is where the information is actually held. User._meta.get_field('email').unique is just a @property which looks into it.

This should work for syncdb too, so you will have consistency with the database.

Note too, that from Django 1.5 you will not have to do such things, as User model will be pluggable.

回答3:

I am not sure how to use this, but

from django.contrib.auth.models import User
User._meta.get_field_by_name('email')[0].unique=True

should do it. I guess this goes in your models.py before you run syncdb on the auth model. Bout to try this myself.

回答4:

Overriding the clean() method as suggested by mumimo is described here: http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#overriding-the-clean-method

Ordinarily you could use unique=True on your field definition and then use ModelForm, so that it'll automatically run clean() for all of the fields in your form, but if you're using the django.auth user class you can't modify the fields.

回答5:

You can do the same thing using this in Abstract User Model:

class User(AbstractUser):
...

class Meta:
    unique_together = ('email',)

来源：https://stackoverflow.com/questions/5773970/django-auth-user-with-unique-email

标签

python

django

django-authentication