formset example code

forms.py

class MyForm(forms.Form):
    is_interesting = forms.BooleanField(required=False)
    
    def __init__(self, *args, **kwargs):
        self.object = kwargs['initial']['obj']
        super(MyForm, self).__init__(*args, **kwargs)
        
    def save(self):
        ...

template.html

    <form action='.' method='POST'>
        {{ formset.management_form }}
        
        {% if formset.errors %}
            <ul class='errorlist'><li>There are Errors. Details below...</li></ul>
        {% endif %}
        
        {% for form in formset %}
            <div class="subform">
                {# NOTE: form.object is a MyModel instance #}
                <h3>"{{ form.object.name }}"</h3>
                <div class="parent">
                    {{ form.as_p }}
                </div>
            </div>
        {% endfor %}
        <div>
            <button type='submit'>Submit</button>
        </div>
    </form>

views.py

from django.forms.formsets import formset_factory
from django.http import HttpResponseRedirect
from .models import MyModel
from annoying.decorators import render_to

GROUP_SIZE = 10

@render_to("template.html")
def my_view(request, rel_obj_id=None):
    queryset = MyModel.objects.filter(…).order_by('id')
        
    MyFormSet = formset_factory(MyForm, extra=0)
    formset = MyFormSet(request.POST or None, initial=[{'obj': obj} for obj in queryset[:GROUP_SIZE]]) 
    
    if formset.is_valid():
        for form in formset:
            form.save()
        
        # load the page fresh (easier than making a new, empty formset)
        return HttpResponseRedirect(request.path)
    
    return locals()