如何重命名以Django模型上传的图像

from django.db import models
from django.utils.timezone import now

class MyModel(models.Model):
    image = models.ImageField(upload_to='images/%Y/%m/%d/')

from django.core.files.storage import default_storage
from django.utils.timezone import now

def upload_image(image_file):
    # 获取当前时间
    now_str = now().strftime('%Y/%m/%d')
    # 构造文件名
    filename = f'images/{now_str}/{image_file.name}'
    # 保存文件
    default_storage.save(filename, image_file)
    # 返回文件名
    return filename

<img src="{{ my_model.image.url }}" alt="{{ my_model.image.name }}">