- Author:
- asta-ko
- Posted:
- February 11, 2020
- Language:
- Python
- Version:
- Not specified
- Score:
- 0 (after 0 ratings)
Based on https://djangosnippets.org/snippets/2020/ and https://stackoverflow.com/questions/5146539/streaming-a-csv-file-in-django Can be used on really large querysets.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | import csv
from io import StringIO
from django.contrib import admin
from django.core.paginator import Paginator
from django.http import StreamingHttpResponse
def export_as_csv_action(description="Export selected objects as CSV file", header=True):
def export_as_csv(modeladmin, request, queryset):
def chunked_iterator(queryset, chunk_size=1000):
paginator = Paginator(queryset, chunk_size)
for page in range(1, paginator.num_pages + 1):
for obj in paginator.page(page).object_list:
yield obj
queryset = chunked_iterator(queryset)
def row_generator(queryset):
csvfile = StringIO()
csvwriter = csv.writer(csvfile)
def read_and_flush():
csvfile.seek(0)
data = csvfile.read()
csvfile.seek(0)
csvfile.truncate()
return data
header = False
if not header:
header = True
csvwriter.writerow(['email','last_name'])
data = read_and_flush()
yield data
for obj in queryset:
csvwriter.writerow([obj.email, obj.last_name]) #your data here
data = read_and_flush()
yield data
response = StreamingHttpResponse(row_generator(queryset),
content_type="text/csv")
response['Content-Disposition'] = 'attachment; filename=%s.csv' % 'yourfilename'
return response
export_as_csv.short_description = description
return export_as_csv
|
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