如何将当前活动用户作为外键添加到djangorestframework中的创建post模型中？

from django.contrib.auth.models import User
from rest_framework import serializers
from rest_framework import viewsets
from rest_framework.permissions import IsAuthenticated
from rest_framework.authentication import TokenAuthentication
from django.views.decorators.csrf import csrf_exempt
from rest_framework.decorators import api_view, permission_classes, authentication_classes

class Post(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    user = models.ForeignKey(User, on_delete=models.CASCADE)

class PostSerializer(serializers.ModelSerializer):
    class Meta:
        model = Post
        fields = ['title', 'content']

class PostViewSet(viewsets.ModelViewSet):
    queryset = Post.objects.all()
    serializer_class = PostSerializer
    permission_classes = [IsAuthenticated]
    authentication_classes = [TokenAuthentication]

    def perform_create(self, serializer):
        serializer.save(user=self.request.user)

from django.urls import include, path
from rest_framework.routers import DefaultRouter

router = DefaultRouter()
router.register(r'posts', PostViewSet)

urlpatterns = [
    path('', include(router.urls)),
]