Django - Creating form for editing multiple instance of model

Question

Note: Django/Python beginner, hope this question is clear

I need to create a form where multiple instances of a model can be edited at once in a single form, and be

Answer 1

You need to use a FormSet, in particular a ModelFormSet:

...
GuestFormSet = modelformset_factory(Guest, form=ExtraForm)

in your view you can use it as a normal form:

formset = GuestFormSet(data=request.POST)

if formset.is_valid():
  formset.save()

and in your template:

   <form method="post" action="">
     {{ formset.management_form }}
       <table>
         {% for form in formset %}
           {{ form }}
         {% endfor %}
       </table>
   </form>

tip: you can avoid the avoid this boilerplate

if request.method == 'POST':
    form = ExtraForm(request.POST)

    print(form.data)

    # Have we been provided with a valid form?
    if form.is_valid():

with a simple shortcut:

form = ExtraForm(data=request.POST or None)
if form.is_valid():
  ...