Django表单-如何从另一个表单自动填充字段

# models.py
from django.db import models

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

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

# forms.py
from django import forms
from .models import Book

class BookForm(forms.ModelForm):
    class Meta:
        model = Book
        fields = ['title', 'author']

# views.py
from django.shortcuts import render, get_object_or_404, redirect
from .models import Author, Book
from .forms import BookForm

def create_book(request, author_id):
    author = get_object_or_404(Author, id=author_id)
    if request.method == 'POST':
        form = BookForm(request.POST)
        if form.is_valid():
            book = form.save(commit=False)
            book.author = author
            book.save()
            return redirect('book_detail', book.id)
    else:
        form = BookForm(initial={'author': author})
    return render(request, 'create_book.html', {'form': form})