django multiform mixin and view that allows the submission of a) All forms b) Grouped forms c) An individual form

multiform.py

class MultiFormMixin(ContextMixin):

    form_classes = {} 
    prefixes = {}
    success_urls = {}
    grouped_forms = {}
    
    initial = {}
    prefix = None
    success_url = None
     
    def get_form_classes(self):
        return self.form_classes
     
    def get_forms(self, form_classes, form_names=None, bind_all=False):
        return dict([(key, self._create_form(key, klass, (form_names and key in form_names) or bind_all)) \
            for key, klass in form_classes.items()])
    
    def get_form_kwargs(self, form_name, bind_form=False):
        kwargs = {}
        kwargs.update({'initial':self.get_initial(form_name)})
        kwargs.update({'prefix':self.get_prefix(form_name)})
        
        if bind_form:
            kwargs.update(self._bind_form_data())

        return kwargs
    
    def forms_valid(self, forms, form_name):
        form_valid_method = '%s_form_valid' % form_name
        if hasattr(self, form_valid_method):
            return getattr(self, form_valid_method)(forms[form_name])
        else:
            return HttpResponseRedirect(self.get_success_url(form_name))
     
    def forms_invalid(self, forms):
        return self.render_to_response(self.get_context_data(forms=forms))
    
    def get_initial(self, form_name):
        initial_method = 'get_%s_initial' % form_name
        if hasattr(self, initial_method):
            return getattr(self, initial_method)()
        else:
            return self.initial.copy()
        
    def get_prefix(self, form_name):
        return self.prefixes.get(form_name, self.prefix)
        
    def get_success_url(self, form_name=None):
        return self.success_urls.get(form_name, self.success_url)
    
    def _create_form(self, form_name, klass, bind_form):
        form_kwargs = self.get_form_kwargs(form_name, bind_form)
        form_create_method = 'create_%s_form' % form_name
        if hasattr(self, form_create_method):
            form = getattr(self, form_create_method)(**form_kwargs)
        else:
            form = klass(**form_kwargs)
        return form
           
    def _bind_form_data(self):
        if self.request.method in ('POST', 'PUT'):
            return{'data': self.request.POST,
                   'files': self.request.FILES,}
        return {}


class ProcessMultipleFormsView(ProcessFormView):
    
    def get(self, request, *args, **kwargs):
        form_classes = self.get_form_classes()
        forms = self.get_forms(form_classes)
        return self.render_to_response(self.get_context_data(forms=forms))
     
    def post(self, request, *args, **kwargs):
        form_classes = self.get_form_classes()
        form_name = request.POST.get('action')
        if self._individual_exists(form_name):
            return self._process_individual_form(form_name, form_classes)
        elif self._group_exists(form_name):
            return self._process_grouped_forms(form_name, form_classes)
        else:
            return self._process_all_forms(form_classes)
        
    def _individual_exists(self, form_name):
        return form_name in self.form_classes
    
    def _group_exists(self, group_name):
        return group_name in self.grouped_forms
              
    def _process_individual_form(self, form_name, form_classes):
        forms = self.get_forms(form_classes, (form_name,))
        form = forms.get(form_name)
        if not form:
            return HttpResponseForbidden()
        elif form.is_valid():
            return self.forms_valid(forms, form_name)
        else:
            return self.forms_invalid(forms)
        
    def _process_grouped_forms(self, group_name, form_classes):
        form_names = self.grouped_forms[group_name]
        forms = self.get_forms(form_classes, form_names)
        if all([forms.get(form_name).is_valid() for form_name in form_names.values()]):
            return self.forms_valid(forms)
        else:
            return self.forms_invalid(forms)
        
    def _process_all_forms(self, form_classes):
        forms = self.get_forms(form_classes, None, True)
        if all([form.is_valid() for form in forms.values()]):
            return self.forms_valid(forms)
        else:
            return self.forms_invalid(forms)
 
 
class BaseMultipleFormsView(MultiFormMixin, ProcessMultipleFormsView):
    """
    A base view for displaying several forms.
    """
 
class MultiFormsView(TemplateResponseMixin, BaseMultipleFormsView):
    """
    A view for displaying several forms, and rendering a template response.
    """

What is the purpose of get_initial? I see that in the example you have get_login_initial and get_signup_initial return emails. What is the emails used for?

bro this is great and working out of the box
THANKS

so, I am working with 10 forms :) I have a wizard and user can skip/rewind/recreate_submit_new form, why ?? because this is what i need.
again so far working out of the box with just a little modification
such as

from django.template.defaulttags import register

@register.filter
def get_item(dictionary, key):
    return dictionary.get(key)

def get_context_data(self, **kwargs):
    context = super(SignupLoginView, self).get_context_data(**kwargs)
    context['steps_numbering'] = {'foo1': 1, 'foo2': 2, 'foo3': 3, 'foo4': 4, 'foo5': 5,
                            'foo6': 6, 'foo7': 7, 'foo8': 8, 'foo9': 9, 'foo10': 10}
    context['all_steps'] = ['category', 'vehicle', 'model', 'sub', 'year',
                            'revision', 'image', 'part', 'filter', 'stock']
    return context

plus some extras

{% for i in all_steps %}

{% csrf_token %}
{{ forms|get_item:steps|crispy }}

{% endfor %}

threre is Html to make the wizard how ever its still work in progress

what I would love is def login_form_valid(self, form):
to some how make a generic abstract so I dont need 10 times repeated lines

if you have any suggestion .....

Hi jamesrobb. Could you provide an example usage of multiple forms being saved together with one submit button?

I have tried to figure it out by looking at the code, but couldn't make it work. It would be awesome to have that example.

@dannwise

If you put both of the forms under the same submit button this will work. I had to modify his code a bit, I'll post my forked gist tonight or tomorrow.

How do you deal with individual form validation in this case @jamesbrobb

I have copied this gist into my project but it throws an error when running the line 'form_kwargs = self.get_form_kwargs(form_name, bind_form)'

The error message s
form_kwargs = self.get_form_kwargs(form_name, bind_form)
TypeError: get_form_kwargs() takes 1 positional argument but 3 were given

This isn't something I have modified and the values of form_name and bind_form make sense.

Is this an issue with the version of Django / pythin given the last comment on here is about 22 months old?

@PBRWJELF

Any such luck?

Please @jamesbrobb could you show to override the save() method and an example for the post method?
How to override the post() method in the view.py to actually save an object to the database

I tried this but it's not working

class OrderFormView(LoginRequiredMixin, SuccessMessageMixin, MultiFormsView):
template_name = '_order.html'
form_classes = {'cart': CartForm,
'order': OrderForm
}
queryset = Cart.objects.all()
success_url = reverse_lazy('make_payment')

def get_cart_initial(self):
user = self.request.user.get_full_name
return {'user':user}
# return {'email':'[email protected]', 'user':user,}

def get_order_initial(self):
return {'email':'[email protected]'}

def get_context_data(self, **kwargs):
context = super(OrderFormView, self).get_context_data(**kwargs)
context.update({"menu":Menu.objects.all(), "cart": self.queryset})
return context

def post(self, request):

form = OrderForm(request.POST)

if form.is_valid():

form.save()

return redirect('make_payment')

return render(request, self.template_name, context={'form':form,})

def cart_form_valid(self, form):
form.save(self.request)
# cart.menu = self.request.POST['menu']
# cart.qty = self.request.POST['qty']
# cart.price = Menu.objects.filter(id(self.request.POST['pk'])).price
# return redirect('order_view')
# return form(self.request, cart, redirect_url=self.get_success_url())

def order_form_valid(self, form):
order = form.save(self.request)
return redirect('make_payment')
# return form.signup(self.request, order, self.get_success_url())

Thank you so much for this!! But can someone help me with the "grouping" part, cause i'm not able to send like 2 forms, only one or all

I am getting the following error, how can I resolve it?

@caiopaje could you add a screenshot of your view?
From the error, you didn't exposed the field "atividade" field from your forms or you don't have such field in your model "NovaAtividade"

Hi guys, could you help me with a trial to use your approach for my needs?

https://stackoverflow.com/questions/76357340/cannot-proceed-with-multiform-view-in-class-based-views