Question

This Content is from Stack Overflow. Question asked by Manoj Kamble

from io import BytesIO
from xhtml2pdf import pisa
from django.template.loader import get_template
from django.http import HttpResponse
from django.shortcuts import render


def home(request):
    pdf = render_to_pdf("abc.html")
    return HttpResponse(pdf, content_type='application/pdf')


def render_to_pdf(template_src, context_dict={}):
    template = get_template(template_src)
    html = template.render(context_dict)
    result = BytesIO()
    pdf = pisa.pisaDocument(BytesIO(html.encode("ISO-8859-1")), result)
    if not pdf.err:
        return HttpResponse(result.getvalue(), content_type='application/pdf')
    else
        return None

Solution

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 BytesIO

def 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
    

Answered by nigel239

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