重写 django 模型中的删除方法

2024年 2月 11日 42.2k 0

重写 django 模型中的删除方法

问题内容

我有一个页面模型,在保存对象期间调用 save 方法中的打印。但是,当对象被删除时,不会触发任何打印,并且似乎永远不会调用删除方法。那么我应该如何覆盖默认的删除方法呢?

class Page(models.Model):
image = models.ImageField()
number = models.PositiveIntegerField(default=0, blank=True, null=True)
chapter = models.ForeignKey(Chapter, on_delete=models.CASCADE)

def get_upload_path(self, filename):
work_slug = self.chapter.volume.work.slug
translator_name = slugify(self.chapter.volume.translator)
volume_number = self.chapter.volume.number
chapter_number = self.chapter.number
name, extension = filename.rsplit('.', 1)
return f'media/{work_slug}/{translator_name}/volumes/volume-{volume_number}/chapters/chapter-{chapter_number}/page-{self.number}.{extension}'

def save(self, *args, **kwargs):
if not self.pk:
last_page = self.chapter.page_set.last()
if last_page:
self.number = last_page.number + 1
self.image.name = self.get_upload_path(self.image.name)
self.image.storage = s3
print(f"Saving Page with image: {self.image.name}")
super().save(*args, **kwargs)

def delete(self, *args, **kwargs):
print(f"Deleting Page with image: {self.image.name}")

image_name = self.image.name
try:
s3.delete(image_name)
print(f"Successfully deleted from S3: {image_name}")
except Exception as e:
print(f"Error deleting from S3: {e}")

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

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正确答案

删除一个对象时调用 model 的 delete 方法。如果您尝试删除查询集(例如从 django 管理列表页面删除),您必须覆盖模型的查询集。

class PageQuerySet(models.QuerySet):
def delete(self):
print("deleting queryset")
return super().delete()

class PageManager(models.Manager):
def get_queryset(self):
return PageQuerySet(model=self.model, using=self._db, hints=self._hints)

class Page(models.Model):
image = models.ImageField()
number = models.PositiveIntegerField(default=0, blank=True, null=True)
chapter = models.ForeignKey(Chapter, on_delete=models.CASCADE)

objects = PageManager()

def get_upload_path(self, filename):
work_slug = self.chapter.volume.work.slug
translator_name = slugify(self.chapter.volume.translator)
volume_number = self.chapter.volume.number
chapter_number = self.chapter.number
name, extension = filename.rsplit('.', 1)
return f'media/{work_slug}/{translator_name}/volumes/volume-{volume_number}/chapters/chapter-{chapter_number}/page-{self.number}.{extension}'

def save(self, *args, **kwargs):
if not self.pk:
last_page = self.chapter.page_set.last()
if last_page:
self.number = last_page.number + 1
self.image.name = self.get_upload_path(self.image.name)
self.image.storage = s3
print(f"Saving Page with image: {self.image.name}")
super().save(*args, **kwargs)

def delete(self, *args, **kwargs):
print(f"Deleting Page with image: {self.image.name}")

image_name = self.image.name
try:
s3.delete(image_name)
print(f"Successfully deleted from S3: {image_name}")
except Exception as e:
print(f"Error deleting from S3: {e}")

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

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