View didn't return an HttpResponse object. It returned None instead

Question

The view below is gives me the error when using the POST method. I\'m trying to load the model data into a form, allow the user to edit, and then update the database. When I try

Answer 1

I was with this same error, believe it or not, was the indentation of Python.

Answer 2

your error to the indentation of a Python file. You have to be careful when following tutorials and/or copy-pasting code. Incorrect indentation can waste lot of valuable time.

Answer 3

You are redirecting if form.is_valid() but what about the form is invalid? There isn't any code that get's executed in this case? There's no code for that. When a function doesn't explicitly return a value, a caller that expects a return value is given None. Hence the error.

You could try something like this:

def edit(request, row_id):
    rating = get_object_or_404(Rating, pk=row_id)
    context = {'form': rating}
    if request.method == "POST":
        form = RatingForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('home.html')
        else :
            return render(request, 'ratings/entry_def.html', 
                          {'form': form})
    else:
        return render(
            request,
            'ratings/entry_def.html',
            context
        )

This will result in the form being displayed again to the user and if you have coded your template correctly it will show which fields are invalid.