目錄
重寫 django 模型中的刪除方法
Feb 11, 2024 pm 07:15 PM問題內容
我有一個頁面模型,在儲存物件期間呼叫 save 方法中的列印。但是,當物件被刪除時,不會觸發任何列印,並且似乎永遠不會呼叫刪除方法。那我應該如何覆蓋預設的刪除方法呢?
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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正確答案
刪除一個物件時呼叫 model 的 delete
方法。如果您嘗試刪除查詢集(例如從 django 管理清單頁面刪除),您必須覆寫模型的查詢集。
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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