我将1.2.5与标准ImageField一起使用，并使用内置的存储后端。文件上传正常，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。

您可以接收pre_delete或post_delete信号（请参见下面的@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)

尝试django-cleanup

pip install django-cleanup

settings.py

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

Django 1.5解决方案：我出于各种内部原因使用post_delete。

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)

我将其粘贴在models.py文件的底部。

该original_image字段ImageField在我的Photo模型中。

此代码还可以通过“管理”面板在Django 1.4上很好地运行。

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空间和路径很重要，否则删除后模型也将保持无效。

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)

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。如果删除在其他地方引用的文件，则会出现问题。

就我而言，这似乎是适当的，因为我有一个专用的文件模型来管理所有文件。

注意：由于某种原因，post_delete似乎无法正常工作。文件被删除，但是数据库记录仍然保留，这与我所期望的完全相反，即使在错误情况下也是如此。pre_delete工作正常。

也许有点晚了。但是对我来说，最简单的方法是使用post_save信号。只是要记住，即使在QuerySet删除过程中也会执行信号，但是在QuerySet删除过程中不会执行[model] .delete（）方法，因此这不是重写它的最佳选择。

core / models.py：

from django.db import models
from django.db.models.signals import post_delete
from core.signals import delete_image_slide
SLIDE1_IMGS = 'slide1_imgs/'

class Slide1(models.Model):
    title = models.CharField(max_length = 200)
    description = models.CharField(max_length = 200)
    image = models.ImageField(upload_to = SLIDE1_IMGS, null = True, blank = True)
    video_embed = models.TextField(null = True, blank = True)
    enabled = models.BooleanField(default = True)

"""---------------------------- SLIDE 1 -------------------------------------"""
post_delete.connect(delete_image_slide, Slide1)
"""--------------------------------------------------------------------------"""

core / signals.py

import os

def delete_image_slide(sender, **kwargs):
    slide = kwargs.get('instance')
    try:
        os.remove(slide.image.path)
    except:
        pass

此功能将在Django 1.3中删除，因此我不会依赖它。

您可以delete在完全从数据库中删除条目之前，覆盖相关模型的方法以删除文件。

编辑：

这是一个简单的例子。

class MyModel(models.Model):

    self.somefile = models.FileField(...)

    def delete(self, *args, **kwargs):
        somefile.delete()

        super(MyModel, self).delete(*args, **kwargs)

确保使用post_delete是正确的方法。有时候，虽然事情可能会出错，但文件不会被删除。当然，在使用post_delete之前，您可能有一堆旧文件没有被删除。我创建了一个函数，该函数根据对象引用的文件不存在然后删除对象来删除对象的文件，如果文件中没有对象，则删除对象，也可以基于“活动”标志删除对象。对象..我添加到大多数模型中的东西。您必须向其传递要检查的对象，对象文件的路径，文件字段以及删除不活动对象的标志：

def cleanup_model_objects(m_objects, model_path, file_field='image', clear_inactive=False):
    # PART 1 ------------------------- INVALID OBJECTS
    #Creates photo_file list based on photo path, takes all files there
    model_path_list = os.listdir(model_path)

    #Gets photo image path for each photo object
    model_files = list()
    invalid_files = list()
    valid_files = list()
    for obj in m_objects:

        exec("f = ntpath.basename(obj." + file_field + ".path)")  # select the appropriate file/image field

        model_files.append(f)  # Checks for valid and invalid objects (using file path)
        if f not in model_path_list:
            invalid_files.append(f)
            obj.delete()
        else:
            valid_files.append(f)

    print "Total objects", len(model_files)
    print "Valid objects:", len(valid_files)
    print "Objects without file deleted:", len(invalid_files)

    # PART 2 ------------------------- INVALID FILES
    print "Files in model file path:", len(model_path_list)

    #Checks for valid and invalid files
    invalid_files = list()
    valid_files = list()
    for f in model_path_list:
        if f not in model_files:
            invalid_files.append(f)
        else:
            valid_files.append(f)
    print "Valid files:", len(valid_files)
    print "Files without model object to delete:", len(invalid_files)

    for f in invalid_files:
        os.unlink(os.path.join(model_path, f))

    # PART 3 ------------------------- INACTIVE PHOTOS
    if clear_inactive:
        #inactive_photos = Photo.objects.filter(active=False)
        inactive_objects = m_objects.filter(active=False)
        print "Inactive Objects to Delete:", inactive_objects.count()
        for obj in inactive_objects:
            obj.delete()
    print "Done cleaning model."

这是您可以使用的方式：

photos = Photo.objects.all()
photos_path, tail = ntpath.split(photos[0].image.path)  # Gets dir of photos path, this may be different for you
print "Photos -------------->"
cleanup_model_objects(photos, photos_path, file_field='image', clear_inactive=False)  # image file is default

确保在文件之前写“ self ”。所以上面的例子应该是

def delete(self, *args, **kwargs):
        self.somefile.delete()

        super(MyModel, self).delete(*args, **kwargs)

我已经忘记了文件之前的“自我”，并且在全局命名空间中查找时仍然无法正常工作。

如果您的项目中已经有许多未使用的文件并想要删除它们，则可以使用django实用程序django-unused-media

Django 2.x解决方案：

无需安装任何软件包！在Django 2中非常容易处理。我已经尝试过使用Django 2和SFTP存储的以下解决方案（但是我认为它可以与任何存储一起使用）

首先编写一个自定义管理器。因此，如果您希望能够使用objects方法删除模型文件，则必须编写并使用[Custom Manager] [3]（用于的覆盖delete()方法objects）：

class CustomManager(models.Manager):
    def delete(self):
        for obj in self.get_queryset():
            obj.delete()

现在，您必须先删除，image然后再删除模型本身，然后再将模型分配CustomManager给模型，您必须objects在模型内部进行初始化：

class MyModel(models.Model):
    image = models.ImageField(upload_to='/pictures/', blank=True)
    objects = CustomManager() # add CustomManager to model
    def delete(self, using=None, keep_parents=False):

    objects = CustomManager() # just add this line of code inside of your model

    def delete(self, using=None, keep_parents=False):
        self.image.storage.delete(self.song.name)
        super().delete()

我可能有一个特殊情况，因为我在具有动态目录名称的文件字段上使用了upload_to选项，但是我发现的解决方案是使用os.rmdir。

在型号中：

import os

...

class Some_Model(models.Model):
     save_path = models.CharField(max_length=50)
     ...
     def delete(self, *args,**kwargs):
          os.rmdir(os.path.join(settings.MEDIA_ROOT, self.save_path)
          super(Some_Model,self).delete(*args, **kwargs)