(Django 기초) Subscribeapp - RedirectView

# pragmatic\urls.py

urlpatterns = [
    path('admin/', admin.site.urls),
    path('accounts/', include('accountapp.urls')),
    path('profiles/', include('profileapp.urls')),
    path('articles/', include('articleapp.urls')),
    path('comments/', include('commentapp.urls')),
    path('projects/', include('projectapp.urls')),
    path('subscribes/', include('subscribeapp.urls')),
] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

# pragmatic\settings.py

# ...

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'bootstrap4',
    'profileapp',
    'accountapp',
    'articleapp',
    'commentapp',
    'projectapp',
    'subscribeapp',
]

# ...

# subscribeapp\models.py
class Subscription(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='subscription')
    project = models.ForeignKey(Project, on_delete=models.CASCADE, related_name='subscription')

    class Meta:
        unique_together = ('user', 'project')

# subscribeapp\views.py
@method_decorator(login_required, 'get')
class SubscriptionView(RedirectView):
    def get_redirect_url(self, *args, **kwargs):
        return reverse('projectapp:detail', kwargs={'pk': self.request.GET.get('project_pk')})

    def get(self, request, *args, **kwargs): 
        project = get_object_or_404(Project, pk=self.request.GET.get('project_pk')) 
        user = self.request.user 
        subscription = Subscription.objects.filter(user=user, project=project) 
        if subscription.exists(): 
            subscription.delete() 
        else: 
            Subscription(user=user, project=project).save() 
        return super(SubscriptionView, self).get(request, *args, **kwargs)

# subscribeapp\urls.py
app_name = 'subscribeapp'

urlpatterns = [
    path('subscribe/', SubscriptionView.as_view(), name='subscribe'),
]

# projectapp\views.py
class ProjectDetailView(DetailView, MultipleObjectMixin):
    model = Project
    context_object_name = 'target_project'
    template_name = 'projectapp/detail.html'
    paginate_by = 25

    def get_context_data(self, **kwargs):
        project = self.object
        user = self.request.user

        if user.is_authenticated:
            subscription = Subscription.object.filter(user=user, project=project)

        object_list = Article.objects.filter(project=self.get_object())
        return super(ProjectDetailView, self).get_context_data(object_list=object_list,
                                                               Subscription=subscription,
                                                               **kwargs)