When a user uploads an image from the Django admin panel, I want to change the image format to '.webp'. I have overridden the save method of the model. Webp file is generated in the media/banner folder but the generated file is not saved in the database. How can I achieve that?

def save(self, *args, **kwargs):super(Banner, self).save(*args, **kwargs)im = Image.open(self.image.path).convert('RGB')name = 'Some File Name with .webp extention' im.save(name, 'webp')self.image = im

But After saving the model, instance of the Image class not saved in the database?

My Model Class is :

class Banner(models.Model):image = models.ImageField(upload_to='banner')device_size = models.CharField(max_length=20, choices=Banner_Device_Choice)

from django.core.files import ContentFile

If you already have the webp file, read the webp file, put it into the ContentFile() with a buffer (something like io.BytesIO). Then you can proceed to save the ContentFile() object to a model. Do not forget to update the model field, and save the model!

https://docs.djangoproject.com/en/4.1/ref/files/file/

Alternatively

"django-webp-converter is a Django app which straightforwardly converts static images to WebP images, falling back to the original static image for unsupported browsers."

It might have some save capabilities too.

https://django-webp-converter.readthedocs.io/en/latest/

The cause

You are also saving in the wrong order, the correct order to call the super().save() is at the end.

Edited, and tested solution:

from django.core.files import ContentFile
from io import BytesIOdef save(self, *args, **kwargs):#if not self.pk: #Assuming you don't want to do this literally every time an object is saved.img_io = BytesIO()im = Image.open(self.image).convert('RGB')im.save(img_io, format='WEBP')name="this_is_my_webp_file.webp"self.image = ContentFile(img_io.getvalue(), name)super(Banner, self).save(*args, **kwargs) #Not at start  anymore