[Python] Error: Method Not Allowed (POST): "POST / HTTP/1.1" 405 0

I'm trying to make register possible on the homepage, so I don't have a seperate URL to handle registration. I'm trying to send the form through get_context_data, however it's not working. Here's my code:

forms.py

class UserRegistrationForm(forms.ModelForm):
password = forms.CharField(widget=forms.PasswordInput)

class Meta:
model = User

fields = [
'username',
'password',
]


views.py

class BoxesView(ListView):
template_name = 'polls.html'

def get_context_data(self):
context = super(BoxesView, self).get_context_data()

# login
if self.request.method == 'POST':
form = UserRegistrationForm(self.request.POST or None)
context['form'] = form
if form.is_valid():
username = form.cleaned_data['username']
password = form.cleaned_data['password']
user = User.objects.create_user(username=username, password=password)
user.save()
return redirect('/')
else:
print(form.errors) #doesn't print anything
print(form.non_field_errors()) #doesn't print anything
print('Errors') #doesn't print anything
else:
form = UserRegistrationForm()
context['form'] = form

return context

def get_queryset(self):
pass


base.html

<form action="" enctype="multipart/form-data" method="post">{% csrf_token %}
<div class="registerBox">
{{ form.username }}
{{ form.password }}
<input type="submit" value="register"/>
</div>
</form>


So when I submit the form it gives this error: Method Not Allowed (POST): "POST / HTTP/1.1" 405 0

And it isn't creating a new User. Any idea what the problem is?

EDIT: Tried FormMixin, got this error: The view app.views.BoxesView didn't return an HttpResponse object. It returned None instead.

class BoxesView(ListView):
template_name = 'polls.html'
form_class = UserRegistrationForm

def post(self, request, *args, **kwargs):
form = self.get_form()
if form.is_valid():
username = form.cleaned_data['username']
password = form.cleaned_data['password']
user = User.objects.create_user(username=username, password=password)
user.save()
return redirect('/')

def get_context_data(self):
context = super(BoxesView, self).get_context_data()
context['form'] = self.get_form()


return context

def get_queryset(self):
pass

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