如果登录不存在，则Django rest创建用户

from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status
from django.contrib.auth.models import User

class UserRegistrationAPIView(APIView):
    def post(self, request):
        username = request.data.get('username')
        password = request.data.get('password')

        if not User.objects.filter(username=username).exists():
            user = User.objects.create_user(username=username, password=password)
            return Response({'message': 'User created successfully'}, status=status.HTTP_201_CREATED)
        else:
            return Response({'message': 'Username already exists'}, status=status.HTTP_400_BAD_REQUEST)

from django.urls import path
from .views import UserRegistrationAPIView

urlpatterns = [
    path('api/register/', UserRegistrationAPIView.as_view(), name='user-registration'),
]