CreateView with OneToOneField relation in one View - django

Question

I'm a Django beginner and try to implement a class based CreateView with two forms and an OneToOne relation but have no glue how to do this in one view.
For example: the following is given:
#models.py
# some imports..
class RedItem(models.Model):
name = models.Charfield(max_length=255)
storage = models.OneToOneField("Storage", on_delete=models.CASCADE)
class BlueItem(models.Model):
name = models.Charfield(max_length=255)
storage = models.OneToOneField("Storage", on_delete=models.CASCADE)
class Storage(models.Model):
shelf = models.Charfield(max_length=255)
room = models.Charfield(max_length=255)
...the View:
#views.py
from django.views.generic.edit import CreateView
from .models import RedItem, BlueItem, Storage
# some other imports..
class RedItemCreate(CreateView):
model = RedItem
fields = ['name']
template_name_suffix = "_form"
```html
and a Form:
```html
<form method="post">{% csrf_token %}
{{ form.as_p }}
<input type="submit" value="Save">
</form>
The question is now how can a user fill in both (e.g. RedItem + Storage) in one batch?
Thanks in advance for any direction.
Update and a working approach:
I have to create forms in forms.py and add it the the CreateView.
#urls.py
from django.urls import path
from .views import *
urlpatterns = [
path('reditemlist/', ExampleList.as_view(), name='example_list'),
path('reditemcreate/', ExampleCreate.as_view(), name='example_create')
]
#forms.py
from django.forms import ModelForm
from .models import RedItem, Storage
class RedItemForm(ModelForm):
class Meta:
model = RedItem
fields = ['name']
class StorageForm(ModelForm):
class Meta:
model = Storage
fields = ['shelf']
And the CreateView:
#views.py
from django.shortcuts import render
from django.views.generic.list import ListView
from django.views.generic.edit import CreateView
from .models import *
from .forms import *
from django.urls import reverse_lazy
class ExampleList(ListView):
model = RedItem
class ExampleCreate(CreateView):
model = RedItem
form_class = RedItemForm
success_url = reverse_lazy('example_list')
def get_context_data(self, **kwargs):
context = super(ExampleCreate, self).get_context_data(**kwargs)
if self.request.POST:
context['reditem'] = RedItemForm(self.request.POST)
context['storage'] = StorageForm(self.request.POST)
else:
context['reditem'] = RedItemForm()
context['storage'] = StorageForm()
return context
def form_valid(self, form):
context = self.get_context_data()
storage = context['storage']
if storage.is_valid() and form.is_valid():
f = form.save()
shelf = storage.save(commit = False)
shelf.reditem = f
shelf.save()
return super().form_valid(form)
<form method="post">{% csrf_token %}
{{ form.as_p }}
{{ storage.as_p }}
<input type="submit" value="Save">
</form>
Next stop: UpdateView