如何根据Django中的模型实例数填充CreateView字段

# models.py
from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=100)
    publication_year = models.IntegerField()

# views.py
from django.views.generic.edit import CreateView
from .models import Book

class BookCreateView(CreateView):
    model = Book
    fields = ['title', 'author', 'publication_year']

    def get_initial(self):
        initial = super().get_initial()
        # 获取Book模型的实例数量
        book_count = Book.objects.count()
        # 根据实例数量设置字段的初始值
        initial['title'] = f'Book {book_count + 1}'
        return initial