Download BinaryFiled Data - django

Question

how to download BinaryField Data/file using template. like we did for FileField.
<td><a href={{certificate.bytes.url}} download></a>
I past all url.py and view.py file below please look This may give extract view of my code. and please help me with this i am new to Django. ............................................................................................................................................................
url.py
from django.conf.urls.static import static
from django.conf.urls import url
from django.views.defaults import page_not_found
urlpatterns=[
path('',views.index, name = 'index'),
url(r'^list/$', views.list, name='list'),
url(r'^list/create$', views.certificate_create, name='certificate_create'),
url(r'^list/(?P<id>\d+)/update$', views.certificate_update, name='certificate_update'),
url(r'^list/(?P<id>\d+)/delete$', views.certificate_delete, name='certificate_delete'),
path('download',views.download, name = 'download'),
]
if settings.DEBUG:
urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

Answer 1

So, we need Django models which contains BinaryField for example.
models.py
class Person(models.Model):
name = models.CharField(max_length=55)
surname = models.CharField(max_length=55)
image = models.BinaryField()
class Meta:
db_table = 'person'
urls.py
from django.urls import path
from . import views
urlpatterns = [
path('', views.index, name='index'),
path('download/<int:pk>/', views.download, name='download'),
]
views.py
import io
from django.shortcuts import render
from django.http import FileResponse
from .models import Person
def index(request):
# there are listed all models.
persons = Person.objects.all()
return render(request, 'index.html', {'persons': persons})
def download(request, pk):
# this url is for download
try:
obj = Person.objects.get(pk=pk)
except Person.DoesNotExist as exc:
return JsonResponse({'status_message': 'No Resource Found'})
get_binary = obj.image
if get_binary is None:
return JsonResponse({'status_message': 'Resource does not contian image'})
if isinstance(get_binary, memoryview):
binary_io = io.BytesIO(get_binary.tobytes())
else:
binary_io = io.BytesIO(get_binary)
response = FileResponse(binary_io)
response['Content-Type'] = 'application/x-binary'
response['Content-Disposition'] = 'attachment; filename="{}.png"'.format(pk) # You can set custom filename, which will be visible for clients.
return response
index.html
{% for person in persons %}
{{ person.name }}<br />
{% endfor %}
This is solution to send binary file from server and download. All components are shown. Good luck !