Gantikan kaedah padam dalam model django

Kandungan soalan

Saya mempunyai model halaman yang memanggil cetakan dalam kaedah simpan semasa menyimpan objek. Walau bagaimanapun, apabila objek dipadamkan, tiada pencetakan dicetuskan dan kaedah padam nampaknya tidak pernah dipanggil. Jadi bagaimana saya harus mengatasi kaedah padam lalai?

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)

Jawapan betul

Panggil kaedah delete model apabila memadam objek. Jika anda cuba memadam set pertanyaan (cth. daripada halaman senarai pentadbir django), anda mesti menulis ganti set pertanyaan model.

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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