Django FileNotFound image url-CodePudding

The idea is I want my form to upload an image with ImageField and then save a base64 of that image with post_save.

Model :

class Feed(models.Model):
    id = models.BigAutoField(primary_key=True)
    title = models.CharField(max_length = 200)
    content = models.TextField()
    thumbnail = models.ImageField(upload_to='feeds/', blank=True)
    img_b64 = models.BinaryField(blank=True, null=True)
    author = models.ForeignKey(Account, on_delete=models.CASCADE)
    date = models.DateTimeField(auto_now_add=True)
    view = models.IntegerField(default=0)
    kategori = models.CharField(max_length=100, default="None")

post_save :

@receiver(post_save, sender=Feed)
def save_base64(sender, instance, **kwargs):
    if instance.thumbnail:
        img_file = open(instance.thumbnail.url, "rb")
        instance.image_b64 = base64.b64encode(img_file.read())
        instance.save()

but I get a FileNotFound error:

Traceback (most recent call last):
  File "D:\Project\Lapor Hoax\env\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
  File "D:\Project\Lapor Hoax\env\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "D:\Project\Lapor Hoax\env\lib\site-packages\django\contrib\auth\decorators.py", line 21, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "D:\Project\Lapor Hoax\laporhoax\account\views.py", line 123, in isi_berita_view
    form.save()
  File "D:\Project\Lapor Hoax\env\lib\site-packages\django\forms\models.py", line 468, in save
    self.instance.save()
  File "D:\Project\Lapor Hoax\env\lib\site-packages\django\db\models\base.py", line 726, in save
    self.save_base(using=using, force_insert=force_insert,
  File "D:\Project\Lapor Hoax\env\lib\site-packages\django\db\models\base.py", line 774, in save_base
    post_save.send(
  File "D:\Project\Lapor Hoax\env\lib\site-packages\django\dispatch\dispatcher.py", line 180, in send
    return [
  File "D:\Project\Lapor Hoax\env\lib\site-packages\django\dispatch\dispatcher.py", line 181, in <listcomp>
    (receiver, receiver(signal=self, sender=sender, **named))
  File "D:\Project\Lapor Hoax\laporhoax\feed\models.py", line 43, in save_base64
    img_file = open(instance.thumbnail.url, "rb")

Exception Type: FileNotFoundError at /berita/add/
Exception Value: [Errno 2] No such file or directory: '/media/feeds/sisi_q1f0hdr.jpeg'

where did it go wrong? or if somebody can come up with a better idea to save a base64 with ImageField will be much appreciated

CodePudding user response：

Why don't you just override save method in model, if you want to have just another base 64 image field.

class ExampleModel(models.Model):
    image = models.ImageField()
    base_64_image = models.BinaryField()

    def save(self):
        self.base_64_image = get_base_64_image(self.image.file)
        return super().save()```