如何为 Django 项目设置不区分大小写的用户名和 email

Question

我对 Django 中的用户进行了以下身份验证：

class EmailBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        UserModel = get_user_model()
        try:
            user = UserModel.objects.get(email=username)
        except UserModel.DoesNotExist:
            return None
        else:
            if user.check_password(password):
                return user
        return None

def register(request):
    if request.method == 'POST':
        form = UserRegisterForm(request.POST)
        if form.is_valid():
            form.save()
            username = form.cleaned_data.get('username')
            messages.success(request, f'Your account has been created! You are now able to log in')
            return redirect('login')
    else:
        form = UserRegisterForm()
    return render(request, 'users/register.html', {'form': form})

用户可以使用他们的用户名或 email 登录，但如果 email 或用户名有区分大小写的字母，则会显示为错误：

Please enter the correct username and password. Note that both fields may be case-sensitive.

模型.py

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)

forms.py

class UserRegisterForm(UserCreationForm):
    email = forms.EmailField()

    class Meta:
        model = User
        fields = ['username', 'email', 'password1', 'password2']

我的问题：如何使用不区分大小写的用户名或 email 对用户进行身份验证：

Answer 1

如果您想让用户名/电子邮件不区分大小写，我认为一种简单的方法是更新您的视图，如下所示：

def register(request):
    if request.method == 'POST':
        form = UserRegisterForm(request.POST)
        if form.is_valid():
            username = form.cleaned_data.get('username').lower()
            form.save()
            messages.success(request, f'Your account has been created! You are now able to log in')
            return redirect('login')
    else:
        form = UserRegisterForm()
    return render(request, 'users/register.html', {'form': form})

Answer 2

注册用户时需要将其设为小写/大写。

def register(request):
    if request.method == 'POST':
        form = UserRegisterForm(request.POST)
        if form.is_valid():
            username = form.cleaned_data.get('username')
            form.cleaned_data['username'] = username.lower()
            # do same for email if needed
            form.save()
            messages.success(request, f'Your account has been created! You are now able to log in')
            return redirect('login')
    else:
        form = UserRegisterForm()
    return render(request, 'users/register.html', {'form': form})

并且在对用户进行身份验证时检查相同的情况。

class EmailBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        UserModel = get_user_model()
        try:
            user = UserModel.objects.get(email=username.lower())
        except UserModel.DoesNotExist:
            return None
        else:
            if user.check_password(password):
                return user
        return None