Why a pdf file download button on a page, not working?

Using Django
1

I have designed a PDF button in the blogs.html file to download a PDF file that has been uploaded from the admin panel. It does not work. I have coded models.py, admin.py, and urls.py in the blogs app, as well as the blogs.html file. Need for improvement?

model.py

class Blog(models.Model):
    title = models.CharField(max_length=100)
    slug = models.SlugField(max_length=150, blank=True, unique=True)
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    featured_image = models.ImageField(upload_to='uploads/%y/%m/%d')
    short_description = CKEditor5Field('short description', config_name='extends')
    blog_body = CKEditor5Field('blog body', config_name='extends')
    pdf_file = models.FileField(upload_to='pdfs/', blank=True, null=True)
    created_at = models.DateTimeField(auto_now_add=True)
    

    def __str__(self):
        return self.title
,,,

admin.py

class BlogAdmin(admin.ModelAdmin):

    prepopulated_fields = {'slug':('title',)}



    list_display = ('title', 'category', 'auther', 'pdf_file', 'status', 'is_featured',)

admin.site.register(Category)

admin.site.register(Blog, BlogAdmin)

views.py

def download_blog_pdf_by_id(request, blog_id):
    """Handle PDF download using blog ID"""
    blog = get_object_or_404(Blog, id=blog_id)
    
    if not blog.pdf_file:
        raise Http404("No PDF available for this blog post")
    
    file_path = blog.pdf_file.path
    
    if os.path.exists(file_path):
        with open(file_path, 'rb') as pdf:
            response = HttpResponse(pdf.read(), content_type='application/pdf')
            filename = f"{blog.title.replace(' ', '_')}.pdf"
            response['Content-Disposition'] = f'attachment; filename="{filename}"'
            return response
    else:
        raise Http404("PDF file not found")

urls.py

urlpatterns = [
    path('<int:category_id>/', views.posts_by_category, name='posts_by_category'),
    path('blog/download/<int:blog_id>/', views.download_blog_pdf_by_id, name='download_blog_pdf_by_id'),

    
]

blogs.html


                    <!-- download pdf -->
                    {% if pdf_file_exists %}
                    <a href="/download/pdf/{{ pdf_id }}/" class="btn btn-success">
                        <i class="bi bi-file-earmark-pdf me-2"></i>Download PDF
                    </a>
                    {% else %}
                    <button class="btn btn-secondary" disabled>
                        <i class="bi bi-file-earmark-x me-2"></i>PDF Not Available
                    </button>
                    {% endif %}

The link to the page containing the PDF file download button is the PDF download button

2

You will need to be clearer than saying “it does not work”.

What, exactly, happens? What do you see in your logs? Is the URL in the page what you think it should be? What is it? What is the actual URL of the PDF?

All I can see at the moment, is that the link you have is like /download/pdf/{{ pdf_id }}/ but the URL for the view you’ve shared is blog/download/<int:blog_id>/.

It’s a good idea to use the {% url %} tag to generate URLs in templates, to reduce the chance of errors.