如何在django中的多个字段中只使用两个字段进行登录验证？

from django.contrib.auth.models import AbstractUser
from django.db import models

class CustomUser(AbstractUser):
    # 添加自定义字段
    username = models.CharField(max_length=150, unique=True)
    password = models.CharField(max_length=128)

from django.contrib.auth import authenticate

def custom_login_validator(username, password):
    user = authenticate(username=username, password=password)
    if user is not None:
        # 验证成功
        return True
    else:
        # 验证失败
        return False

from django.shortcuts import render
from django.contrib.auth import login
from .validators import custom_login_validator

def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        
        # 使用自定义验证器进行登录验证
        if custom_login_validator(username, password):
            # 登录成功
            user = CustomUser.objects.get(username=username)
            login(request, user)
            return render(request, 'success.html')
        else:
            # 登录失败
            return render(request, 'failure.html')
    else:
        return render(request, 'login.html')