Django：当我使用基于类的视图时，如何在views.py 中获得“pk”？

Question

I'm writhing an app with class based views. I need to receive 'pk' in my views.py file when I load my page using generic DetailView.

My urls.py file:

from django.urls import path
from . views import HomeView, ProfileView, AddPetView, EditPetView, DeletePetView, 
PetProfileView

urlpatterns = [
...
path('profile/pet/<int:pk>', PetProfileView.as_view(), name='pet_profile'),
path('', HomeView.as_view(), name='home'),
]

My views.py file:

from django.shortcuts import render
from django.views.generic import TemplateView, ListView, UpdateView, CreateView, DeleteView, 
DetailView
from django.urls import reverse_lazy
from . models import Pet

class PetProfileView(DetailView):
    model = Pet
    template_name = 'pet_profile.html'
    #key = Pet.objects.values_list('birth_date').get(pk=1)

My Pet Model is:

class Pet(models.Model):
pet_name = models.CharField(max_length=255)
pet_breed = models.CharField(max_length=255)
pet_type = models.CharField(max_length=255)
owner = models.ForeignKey(User, on_delete=models.CASCADE)
pet_reg_date = models.DateField(auto_now_add=True) # when the pet is registered in the site
birth_date = models.DateField()

def __str__(self):
    return self.pet_name + ' | ' + str(self.owner)

# def get_absolute_url(self):
#   return reverse('article-detail', args=str(self.id))
def get_absolute_url(self):
    return reverse('profile')

When I load profile for some pet, I need to get in my view class PetProfileView(DetailView): like a variable the birth date for this specific pet. I will make some calculations with this date

I need to extract from database birh_date column for this specific pet. How to get this pk=? when I load pet_profile page?

I'm not sure if I can describe the case well. If something is not clear, ask me. I will try to explain again.

Answer 1

On class based views:

self.kwargs['pk']

So, in your case

class PetProfileView(DetailView):
    model = Pet
    template_name = 'pet_profile.html'
    def get_context_data(self, **kwargs):
        context['key'] = self.get_object().birth_date
        return context

I don't know what you want to do with the "key" variable. This example is to use on your template. You can access to "birth_date" writting {{key}} or {{object.birth_date}}

Answer 2

As already mentioned you can access the URL parameters like self.kwargs["pk"] . But as you are already using a DetailView which already provides the functionality to retrieve an object via its id you can customize the queryset it uses:

class PetProfileView(DetailView):
    model = Pet
    template_name = 'pet_profile.html'
    queryset = Pet.objects.values_list('birth_date')

(Though without doing this you should also be able to access pet.birth_date in your template)