How to correctly pass merged pdfs as _io.BytesIO object into Django FileResponse()?

Question

I try to merge some pdfs with pypdf and I sadly new Document is an empty page... Any help is apreciated! Thanks in advance!

current_time = datetime.now().strftime("%m-%d-%Y_%H.%M")
obj_list = request.GET.getlist('PDFobj')
qs = CertificatePDF.objects.filter(id__in=obj_list)
pdfs = []
for pdf in qs:
    path = pdf.location.path
    pdfs.append(PdfReader(path))

merger = PdfMerger()
for pdf in pdfs:
    merger.append(pdf)
temp = io.BytesIO()
merger.write(temp)
merger.close()
temp.seek(0)

fn = f'DocuName_{str(current_time)}.pdf'
return FileResponse(temp, as_attachment=True, filename=fn)

I tried with HttpResponse file/attachment also... without any sucess

Answer 1

I figured out that the BytesIO object has to be constructed as a file, and django is able to do this... it is really simple. Here the whole method if anyone needs this in the future:

from django.http import FileResponse
from django.core.files import File
import io
from pypdf import PdfMerger, PdfReader
from datetime import datetime

def download_pdf_multiple(request):
    current_time = datetime.now().strftime("%Y-%m-%d_%H-%M")
    obj_list = request.GET.getlist('PDFobj')
    qs = CertificatePDF.objects.filter(id__in=obj_list)

    pdfs = []
    for pdf in qs:
        path = pdf.location.path
        pdfs.append(PdfReader(path))
    merger = PdfMerger()
    for pdf in pdfs:
        merger.append(pdf)

    temp = io.BytesIO()
    merger.write(temp)
    merger.close()
    temp.seek(0)

    fn = f'DocuName_{str(current_time)}.pdf'
    new_pdf = File(temp)
    return FileResponse(new_pdf, as_attachment=True, filename=fn)