Django Pandas to http response (download file)

Question

Python: 2.7.11

Django: 1.9

Pandas: 0.17.1

How should I go about creating a potentially large xlsx file download? I\'m creating a xlsx file with panda

Answer 1

Just wanted to share a class-based view approach to this, using elements from the answers above. Just override the get method of a Django View. My model has a JSON field which contains the results of dumping a dataframe to JSON with the to_json method.

Python version is 3.6 with Django 1.11.

# models.py
from django.db import models
from django.contrib.postgres.fields import JSONField

class myModel(models.Model):
    json_field = JSONField(verbose_name="JSON data")

# views.py
import pandas as pd
from io import BytesIO as IO
from django.http import HttpResponse
from django.views import View

from .models import myModel

class ExcelFileDownloadView(View):
    """
    Allows the user to download records in an Excel file
    """

    def get(self, request, *args, **kwargs):

        obj = myModel.objects.get(pk=self.kwargs['pk'])
        excel_file = IO()
        xlwriter = pd.ExcelWriter(excel_file, engine='xlsxwriter')
        pd.read_json(obj.json_field).to_excel(xlwriter, "Summary")
        xlwriter.save()
        xlwriter.close()

        excel_file.seek(0)

        response = HttpResponse(excel_file.read(),
                                content_type='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')

        response['Content-Disposition'] = 'attachment; filename="excel_file.xlsx"'
        return response

# urls.py
from django.conf.urls import url
from .views import ExcelFileDownloadView

urlpatterns = [
    url(r'^mymodel/(?P\d+)/download/$', ExcelFileDownloadView.as_view(), name="excel-download"),]