Re: Multiple django inlineformset_factory problem

Ahh, yes, those docs assume you've also read the non-model formset docs:

https://docs.djangoproject.com/en/1.7/topics/forms/formsets/

Why do I get 3 "Implementation" forms, instead of just 1, when I did Controls.objects.get(pk=1), which should specify a single Control? 

It will show one form for each implementation already in the database, plus, by default, one "extra" blank form for adding an additional implementation for that control.

How do I display multiple Implementation Forms for each Control that is returned?

Formsets are for handling an arbitrary number of forms, and it sounds like you want _multiple_ _formsets_.

How do I only display certain elements of the Implementation form, not every field in the model as an HTML <input> field?

Pass in "fields" to your factory call.

https://docs.djangoproject.com/en/1.7/topics/forms/modelforms/#modelform-factory-function

How do I have my views.py interpret the submitted Implementation form data from the user?

I think your case is pretty complicated. Does this seem right?

ControlImplementationSet = inlineformset_factory(Controls, Implementation, fields=['implementation', 'status'])

def the_view(request):
    controls = Controls.objects.all()
    controlsets = []
    if request.method == 'POST':  # handling submitted data
        all_valid = True
        for control in controls:
            formset = ControlImplementationSet(request.POST, instance=control, prefix='control_%s' % control.pk)
            if not formset.is_valid():
                all_valid = False
            controlsets.append(formset)
        if all_valid:
            for formset in controlsets:
                formset.save()
            return redirect('/success!/')
    else:  # displaying the forms the first time
        for control in controls:
            formset = ControlImplementationSet(instance=control, prefix='control_%s' % control.pk)
            controlsets.append(formset)
    return render(request, 'the_template.html', {'controlsets': controlsets})

Then, in your template:

{% for formset in controlsets %}

Control Name: {{ formset.instance.name }}
Control Description: {{ formset.instance.description }}

{% for form in formset %}  {# multiple forms per control #}
Implementation Statement: {{ form.implementation }}
Implementation Status: {{ form.status }}
{% endform %}

{% endfor %}

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