将动态下载路径设置为django

Question

How i can set a dynamic download path to django by change this part:

(settings.MEDIA_ROOT, 'folder/path/file.pdf')

    with open(os.path.join(settings.MEDIA_ROOT, 'folder/path/file.pdf'), 'rb') as fh:
    response = HttpResponse(fh.read(), content_type="application/pdf")
    response['Content-Disposition'] = 'filename=invoice.pdf'
    return response

to something like this:

(settings.MEDIA_ROOT, FUNCTION_RETURN_THE_PATH)

with open(os.path.join(settings.MEDIA_ROOT, FUNCTION_RETURN_THE_PATH), 'rb') as fh:
    response = HttpResponse(fh.read(), content_type="application/pdf")
    response['Content-Disposition'] = 'filename=invoice.pdf'
    return response

If a use function i get many errors, because it expects a string variable in this place and not a function.

in my html there is a for that show all the model to user

{% for printforme in print_user_charges %}
            <tr>
              <td>{{ printforme.invoice_number }}</td>
              <td>{{ printforme.price }} €</td>
              <td>{{  printforme.reason }}</td>
              <td>{{ printforme.customer }} {{ printforme.customer.surname }}</td>
              <td>{{ printforme.charge_date }}</td>
              <td>  <a href="{% url 'download_pdf' printforme.upload_pdf.id %}"> Download </a></td>

the download link drives into a view:

def DownloadPdf(request, charge_id):

with open(os.path.join(settings.MEDIA_ROOT, get_file_path), 'rb') as fh:
    response = HttpResponse(fh.read(), content_type="application/pdf")
    response['Content-Disposition'] = 'filename=invoice.pdf'
    return response

I store pdf, base to the user id like this:

def invoice_path_base_to_usersid(instance, filename):
return 'user_{0}/{1}'.format(instance.customer.id, filename)

So i store pdfs to media/user_{id}/filename.pdf

I want user to downlaod a specific pdf file when he click on the currect item. But i dont know how to use the user id and put it inside the open to download the currect one pdf that user want.

Answer 1

您尚未调用该函数。

with open(os.path.join(settings.MEDIA_ROOT, get_file_path()), 'rb') as fh:

Answer 2

Finally i found a solution, i post it here to help anyone that struggles with that things.

My main problem it was that i was try to get an instance and i do not pass it into any variable before i try to load the file.

I change the open method to, i found the last one more clear.

def DownloadPdf(request, charges_id):

try:
    invoice = Charge.objects.get(pk=charges_id)
except Charge.DoesNotExist:
    raise Http404

response = HttpResponse(File(invoice.upload_pdf), content_type="application/pdf")
response['Content-Disposition'] = 'attachment; filename="mypdf.pdf"'
return response

So the answer is, if you want a dynamicaly download path in django you have to query your model and put the output in a variable.

After that, by calling this variable, in that way:

variable.field_of_model

you can refer to any field of that record and use it as you want