django - 覆盖 django 的模型删除方法进行批量删除

Question

我正在覆盖 Django 的模型删除方法，以便删除磁盘中图像字段的孤立文件，如下所示:

class Image(models.Model):
    img = models.ImageField(upload_to=get_image_path)
    ...
    def delete(self, *args, **kwargs):
        self.img.delete()
        super(Image, self).delete(*args, **kwargs)

当我从管理员中删除单个对象时，这很好用，但是当我选择多个对象并删除它们时，这似乎没有被调用。我已经在谷歌上搜索了一段时间，但没有找到正确的关键字来获得答案，官方文档似乎也没有谈论这个主题。

Answer 1

It does :

The delete() method does a bulk delete and does not call any delete() methods on your models. It does, however, emit the pre_delete and post_delete signals for all deleted objects (including cascaded deletions).

为此，您可以覆盖 QuerySet 上的删除方法，然后应用该 QuerySet作为经理:

class ImageQuerySet(models.QuerySet):

    def delete(self, *args, **kwargs):
        for obj in self:
            obj.img.delete()
        super(ImageQuerySet, self).delete(*args, **kwargs)

class Image(models.Model):
    objects = ImageQuerySet.as_manager()
    img = models.ImageField(upload_to=get_image_path)
    ...
    def delete(self, *args, **kwargs):
        self.img.delete()
        super(Image, self).delete(*args, **kwargs)