如何将外键提交到表单帖子中？python /django

from django.db import models

class User(models.Model):
    name = models.CharField(max_length=100)
    # 其他字段...

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

from django import forms
from .models import Post

class PostForm(forms.ModelForm):
    class Meta:
        model = Post
        fields = ['title', 'content', 'user']

from django.shortcuts import render, redirect
from .forms import PostForm

def create_post(request):
    if request.method == 'POST':
        form = PostForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('post_list')  # 保存成功后重定向到帖子列表页面
    else:
        form = PostForm()
    return render(request, 'create_post.html', {'form': form})

<!-- create_post.html -->
<form method="POST">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">提交</button>
</form>