Foriegn键显示为下拉列表。有没有办法将其显示为文本值？(django)

class Book(models.Model):
    author = models.ForeignKey(Author, on_delete=models.CASCADE)
    author_name = models.CharField(max_length=100, blank=True, null=True)

    def save(self, *args, **kwargs):
        self.author_name = self.author.name
        super().save(*args, **kwargs)

from django import forms
from .models import Book

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

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

def create_book(request):
    if request.method == 'POST':
        form = BookForm(request.POST)
        if form.is_valid():
            book = form.save(commit=False)
            book.author = Author.objects.get(name=form.cleaned_data['author_name'])
            book.save()
            return redirect('book_list')
    else:
        form = BookForm()
    return render(request, 'create_book.html', {'form': form})