当我从数据库/模型中删除对象时,如何让Django Admin删除文件？

Question

我使用1.2.5标准ImageField并使用内置存储后端.文件上传很好但是当我从管理员删除条目时,服务器上的实际文件不会删除.

Answer 1

您可以接收pre_delete或发post_delete信号(请参阅下面的@ toto_tico注释)并在FileField对象上调用delete方法,因此(在models.py中):

class MyModel(models.Model):
    file = models.FileField()
    ...

# Receive the pre_delete signal and delete the file associated with the model instance.
from django.db.models.signals import pre_delete
from django.dispatch.dispatcher import receiver

@receiver(pre_delete, sender=MyModel)
def mymodel_delete(sender, instance, **kwargs):
    # Pass false so FileField doesn't save the model.
    instance.file.delete(False)

Answer 2

尝试django-cleanup

pip install django-cleanup

settings.py

INSTALLED_APPS = (
    ...
    'django_cleanup', # should go after your apps
)

Answer 3

Django 1.5解决方案:我使用post_delete的原因是我的应用程序内部的各种原因.

from django.db.models.signals import post_delete
from django.dispatch import receiver

@receiver(post_delete, sender=Photo)
def photo_post_delete_handler(sender, **kwargs):
    photo = kwargs['instance']
    storage, path = photo.original_image.storage, photo.original_image.path
    storage.delete(path)

我把它放在models.py文件的底部.

该original_image领域是ImageField我的Photo模型.

Answer 4

此代码在Django 1.4上运行良好,也可以在Admin面板上运行.

class ImageModel(models.Model):
    image = ImageField(...)

    def delete(self, *args, **kwargs):
        # You have to prepare what you need before delete the model
        storage, path = self.image.storage, self.image.path
        # Delete the model before the file
        super(ImageModel, self).delete(*args, **kwargs)
        # Delete the file after the model
        storage.delete(path)

在删除模型之前获取存储和路径很重要,否则后者在删除时也会保持无效.

Answer 5

您需要删除同时在实际的文件delete和update.

from django.db import models

class MyImageModel(models.Model):
    image = models.ImageField(upload_to='images')

    def remove_on_image_update(self):
        try:
            # is the object in the database yet?
            obj = MyImageModel.objects.get(id=self.id)
        except MyImageModel.DoesNotExist:
            # object is not in db, nothing to worry about
            return
        # is the save due to an update of the actual image file?
        if obj.image and self.image and obj.image != self.image:
            # delete the old image file from the storage in favor of the new file
            obj.image.delete()

    def delete(self, *args, **kwargs):
        # object is being removed from db, remove the file from storage first
        self.image.delete()
        return super(MyImageModel, self).delete(*args, **kwargs)

    def save(self, *args, **kwargs):
        # object is possibly being updated, if so, clean up.
        self.remove_on_image_update()
        return super(MyImageModel, self).save(*args, **kwargs)

Answer 6

您可以考虑使用pre_delete或post_delete信号:

https://docs.djangoproject.com/en/dev/topics/signals/

当然,删除FileField自动删除的相同原因也适用于此处.如果删除在其他地方引用的文件,则会出现问题.

在我的情况下,这似乎是合适的,因为我有一个专用的文件模型来管理我的所有文件.

注意:由于某种原因,post_delete似乎无法正常工作.该文件被删除,但数据库记录仍然存在,这与我的预期完全相反,即使在错误条件下也是如此.pre_delete工作得很好.