django - ImageField 覆盖同名图像文件

Question

我有模型 UserProfile 和字段 avatar = models.ImageField(upload_to=upload_avatar)

upload_avatar 函数根据user.id 命名图像文件(例如12.png)。

但是当用户更新头像时，新头像名称与旧头像名称一致，Django 会为文件名添加后缀(例如 12-1.png)。

有办法覆盖文件而不是创建新文件吗？

Answer 1

是的，我也遇到了这个问题。这是我所做的。

型号:

from app.storage import OverwriteStorage

class Thing(models.Model):
    image = models.ImageField(max_length=SOME_CONST, storage=OverwriteStorage(), upload_to=image_path)

也在models.py中定义:

def image_path(instance, filename):
    return os.path.join('some_dir', str(instance.some_identifier), 'filename.ext')

在一个单独的文件中，storage.py:

from django.core.files.storage import FileSystemStorage
from django.conf import settings
import os

class OverwriteStorage(FileSystemStorage):

    def get_available_name(self, name):
        """Returns a filename that's free on the target storage system, and
        available for new content to be written to.

        Found at http://djangosnippets.org/snippets/976/

        This file storage solves overwrite on upload problem. Another
        proposed solution was to override the save method on the model
        like so (from https://code.djangoproject.com/ticket/11663):

        def save(self, *args, **kwargs):
            try:
                this = MyModelName.objects.get(id=self.id)
                if this.MyImageFieldName != self.MyImageFieldName:
                    this.MyImageFieldName.delete()
            except: pass
            super(MyModelName, self).save(*args, **kwargs)
        """
        # If the filename already exists, remove it as if it was a true file system
        if self.exists(name):
            os.remove(os.path.join(settings.MEDIA_ROOT, name))
        return name

显然，这些是此处的示例值，但总的来说，这对我来说效果很好，根据需要进行修改应该非常简单。