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You should implement the Post/Redirect/Get architectural pattern [wiki], and thus return a redirect such that the browser will make a GET request next, and thus prevent making another POST request when refreshing the page:
def product_detail(request, product_id):
product = get_object_or_404(Product, pk=product_id)
if request.method == 'POST':
rating = request.POST.get('rating', 3)
content = request.POST.get('content', '')
Review.objects.create(
product=product,
rating=rating,
content=content,
created_by=request.user
)
# redirect to the same page 🖟
return redirect('product_detail', product_id=product_id)
reviews = Review.objects.filter(product=product)
context = {
'product': product,
'reviews': reviews
}
return render(request, 'products/product_detail.html', context)
Source:stackexchange.com