Django - 如何下载文件

Question

I am trying to create a download button in my template for a csv file generated by my website (I am new to Django). I have created the view function and updated urls.py but I get 'DoesNotExist: Page matching query does not exist' when I input the url (' http://127.0.0.1:8000/download_table '). I'd also like to know how to create a link/button to the download in my html template.

views.py:

def download_csv(request):
table_selected = request.POST.get('Table_select')
index_of_table_selected = int(re.search(r'\d+$', table_selected).group())
result_json_selected = request.session.get('result', 'missing')[index_of_table_selected]
dataframe_selected = pd.read_json(result_json_selected)
response = HttpResponse(content_type='text/csv')
response['Content-Disposition'] = 'attachment; filename=%s' % 'Table.csv'
dataframe_selected.to_csv(path_or_buf=response, sep=';', float_format='%.2f', index=False, decimal=",")

return response

urls.py:

urlpatterns = [
path('', views.index, {'pagename': ''}, name='home'),
path('<str:pagename>', views.index, name='index'),
path('download_table/', views.download_csv, name='download_csv'),]

Also, what do I put in my template? Something like this?

<a href="download_table/" download> Download File</a>

That link returns the error

TypeError: download_csv() got an unexpected keyword argument 'filepath'

Answer 1

You're getting 404 because This is the 'app' level urls.py , You need to link it to the 'project' level urls.py

The second error is because download_csv(request) should be download_csv(request, filepath) or better yet, use download_csv(request, **kwargs) It says it got an argument (eg localhost:8000/argument/ ) and you have no variable to contain it.