Django easy_thumbnails和post_delete

Question

我正在從表單中刪除相關模型（與django admin幾乎相同），我有一個包含多個圖像的項目，圖像屬於Item（ForeignKey）。 刪除圖像時，我實現了一個post_delete信號刪除縮略圖和圖像/從表單圖像，問題是，在post_delete縮略圖被刪除，但在數據庫映像入口仍然存在：

# Auto-delete files from filesystem when they are unneeded: 
@receiver(models.signals.post_delete, sender=ImageModel) 
def auto_delete_file_on_delete(sender, instance, **kwargs): 
    """Deletes file from filesystem 
    when corresponding `ImageModel` object is deleted. 
    """ 
    if instance.imagefile: 
     thumbmanager = get_thumbnailer(instance.imagefile) 
     thumbmanager.delete() 

如果我最後添加以下內容，圖像實例也被刪除（預期的行爲）：

# Auto-delete files from filesystem when they are unneeded: 
@receiver(models.signals.post_delete, sender=ImageModel) 
def auto_delete_file_on_delete(sender, instance, **kwargs): 
    """Deletes file from filesystem 
    when corresponding `ImageModel` object is deleted. 
    """ 
    if instance.imagefile: 
     thumbmanager = get_thumbnailer(instance.imagefile) 
     thumbmanager.delete() 
     instance.delete() 

我是否錯過了什麼？刪除實例後不應該發送post_delete信號嗎？爲什麼實例在db中保持不變？ 我認爲這與Queryset刪除行爲有關，但我對此持懷疑態度，因爲如果我刪除該信號，那麼ImageModel的實例將被刪除（儘管縮略圖確實保留在數據庫中）。該模型採用的Django打造的ImageField場 介意，而且不容易縮略圖提供的字段：

class ImageModel(models.Model): 
    ... 
    imagefile = models.ImageField(upload_to="properties/%m/%Y") 
    item = models.ForeignKey('app.ItemModel', related_name='images') 
    ... 

上述解決方案（instance.delete（））工作，沒有任何問題，只是好奇的行爲。

Answer 1

確定了它與添加刪除（保存=假）工作：

# These two auto-delete files from filesystem when they are unneeded: 
@receiver(models.signals.post_delete, sender=ImageModel) 
def auto_delete_file_on_delete(sender, instance, **kwargs): 
    """Deletes file from filesystem 
    when corresponding `ImageModel` object is deleted. 
    """ 
    if instance.imagefile: 
     thumbmanager = get_thumbnailer(instance.imagefile) 
     thumbmanager.delete(save=False) 

Answer 2

您還可以使用django-cleanup，它會自動調用刪除的FileField方法，當你刪除模型。

pip install django-cleanup 

settings.py

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