Re: selectively remove forms from formset in view function

OK - after playing around with this I am finding that it is rather difficult. Instead, I recommend that you only create the forms that you need in the first place in the view function. This requires a change in the structure of my code, so I'll have to make do for the time being with the larger than I would like file size.

On Thursday, May 19, 2016 at 8:18:17 AM UTC-7, Richard Brockie wrote:

Hi,

I'm working with pagination of a large formset in my view function. For forms outside the range to be viewed, I'm currently doing this:

for form in results_formset:
    place_to_test = int(form['placing'].value())

    if place_to_test not in visible_range:
        form.fields['race_number'].widget = HiddenInput()

visible_range is a list of places that should be viewed according to the pagination.

However, most of the formset is hidden. Simply using a HiddenInput() results in a large number of non-visible forms still being sent from the server. I have a scheme where I will condense the hidden information from the non-visible forms to save bandwidth. To do this within the current code structure requires me to be able to remove a non-visible form from the formset.

My code should become something like:

for form in results_formset:

    place_to_test = int(form['placing'].value())
    race_number = form['race_number'].value()

    if place_to_test not in visible_range:

        # need method to remove form from results_formset
        pass

        # condensing the information to save bandwidth
        if place_to_test < range_min:
            hidden_before.append("%s:%s" % (place_to_test, race_number))
        elif place_to_test > range_max:
            hidden_after.append("%s:%s" % (place_to_test, race_number))

I can't find how to remove the non-visible form from the formset - can anyone provide a pointer?

Best wishes,
Richard Brockie

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