Django :如何在表单中将模型一对象与模型二联系起来？

from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)

class Blog(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

from django import forms
from .models import Blog

class BlogForm(forms.ModelForm):
    class Meta:
        model = Blog
        fields = ['title', 'content', 'author']

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

def create_blog(request):
    if request.method == 'POST':
        form = BlogForm(request.POST)
        if form.is_valid():
            blog = form.save()
            return redirect('blog_detail', pk=blog.pk)
    else:
        form = BlogForm()
    return render(request, 'create_blog.html', {'form': form})