Как создать ViewView / UpdateView, используя внешний ключ во вложенной модели

Question

Был в состоянии выполнить CRUD на филиале. Однако я застрял в создании / обновлении / удалении для компонента. Также, когда я перехожу к Testcase CRUD, какие шаги мне нужно сделать.? Пожалуйста, помогите .. Пожалуйста, дайте мне знать, если вам нужно больше информации об этом. .......

PS: я новичок в django (2 недели ... наслаждаюсь этим :-)).

Модель:

    class Branch(models.Model):
    """Model representing a Branches"""

name = models.CharField(max_length=200, db_index=True, unique=True)
summary = models.CharField(max_length=200, db_index=True)

def __str__(self):
    """String for representing the Model object."""
    return self.name

def get_absolute_url(self):
    """Returns the url to access a particular branch instance."""
    return reverse('branch-detail', args=[str(self.id)])


    class Feature(models.Model):
"""Model representing a Feature"""
branch = models.ForeignKey(Branch, on_delete=models.SET_NULL, null=True, related_name='features')
name = models.CharField(max_length=200, db_index=True, unique=True)


def __str__(self):
    """String for representing the Model object."""
    return self.name

def get_absolute_url(self):
    """Returns the url to access a particular feature instance."""
    return reverse('feature-detail', args=[self.branch, str(self.id)])


    class Testcase(models.Model):
"""Model representing a Testcase"""
feature = models.ForeignKey(Feature, on_delete=models.SET_NULL, null=True, related_name='testcases')
name = models.CharField(max_length=200)

def __str__(self):
    """String for representing the Model object."""
    return self.name

def get_absolute_url(self):
    """Returns the url to access a detail record for this testcase."""
    return reverse('testcase-detail', args=[self.feature.branch, self.feature, str(self.id)])

Вид:

    class BranchCreate(CreateView):
model = Branch
fields = '__all__'
success_url = reverse_lazy('index')


    class BranchUpdate(UpdateView):
model = Branch
fields = ['name', 'summary']

def get_success_url(self, **kwargs):
    return reverse_lazy('branch-detail', args=(self.object.pk,))


    class BranchDelete(DeleteView):
model = Branch
success_url = reverse_lazy('index')


    class FeatureCreate(CreateView):
model = Feature
fields = ['name', 'summary']

<<<<< BELOW CODE IS WHAT ALL METHODS I HAVE TRIED >>>>
#def form_valid(self, form):
#    name = get_object_or_404(Feature, name=self.kwargs['name'])
#    name1 = get_object_or_404(Feature, pk=self.kwargs['id'])
#    form.instance.feature = name
#    form.instance.feature = name1
#    return super(FeatureCreate, self).form_valid(form)

# def get_context_object_name(self, obj):
#     """Get the name to use for the object."""
#     if self.context_object_name:
#         return self.context_object_name
#     elif isinstance(obj, Branch):
#         return obj._meta.model_name
#     else:
#         return None

# def get_object(self, queryset=None):
#     if queryset is None:
#         queryset = self.get_queryset()
#     return get_object_or_404(queryset, branch_id=self.kwargs['pk'])

URL:

    urlpatterns = [
path('', views.index, name='index'),
path('branch/<int:pk>', views.BranchDetail.as_view(), name='branch-detail'),
path('branch/<branch>/features/', views.BranchFeatureList.as_view(), name='branch-features'),
path('branch/<branch>/feature/<int:pk>', views.FeatureDetail.as_view(), name='feature-detail'),
path('branch/<branch>/features/<feature>/testcases/', views.FeatureTestcaseList.as_view(), name='feature-testcases'),
path('branch/<branch>/features/<feature>/testcase/<int:pk>', views.TestcaseDetail.as_view(), name='testcase-detail'),
    ]

    urlpatterns += [
path('branch/create/', views.BranchCreate.as_view(), name='branch-create'),
path('branch/<int:pk>/update/', views.BranchUpdate.as_view(), name='branch-update'),
path('branch/<int:pk>/delete/', views.BranchDelete.as_view(), name='branch-delete'),
    ]

    urlpatterns += [
path('branch/<branch>/features/create/', views.FeatureCreate.as_view(), name='feature-create'), >>>>>>>>>> This is where I am stuck at... 
# path('...../<int:pk>/update/', views.FeatureUpdate.as_view(), name='feature_update'),
# path('....../<int:pk>/delete/', views.FeatureDelete.as_view(), name='feature_delete'),
    ]