Interview question

What are Django's generic class-based views like ListView, DetailView, and CreateView? Django के generic class-based views जैसे ListView, DetailView, CreateView क्या हैं?

Answer

Generic CBVs implement common view patterns (listing, detail display, create/update/delete forms) with minimal code, following Django's DRY philosophy.

Generic view	Purpose
ListView	Display a list of objects
DetailView	Display a single object's details
CreateView	Display and process a form to create an object
UpdateView	Display and process a form to edit an object
DeleteView	Display a confirmation and delete an object

from django.views.generic import ListView, DetailView, CreateView, UpdateView, DeleteView
from django.urls import reverse_lazy
from .models import Book

class BookListView(ListView):
    model = Book
    template_name = 'book_list.html'   # defaults to book_list.html if omitted
    context_object_name = 'books'       # defaults to 'object_list' if omitted
    paginate_by = 10

    def get_queryset(self):
        return Book.objects.filter(available=True).order_by('title')

class BookDetailView(DetailView):
    model = Book
    template_name = 'book_detail.html'

class BookCreateView(CreateView):
    model = Book
    fields = ['title', 'author', 'price']
    template_name = 'book_form.html'
    success_url = reverse_lazy('book-list')  # redirect after successful creation

class BookUpdateView(UpdateView):
    model = Book
    fields = ['title', 'price']
    template_name = 'book_form.html'

class BookDeleteView(DeleteView):
    model = Book
    template_name = 'book_confirm_delete.html'
    success_url = reverse_lazy('book-list')

# urls.py
from django.urls import path
urlpatterns = [
    path('books/', BookListView.as_view(), name='book-list'),
    path('books/<int:pk>/', BookDetailView.as_view(), name='book-detail'),
    path('books/new/', BookCreateView.as_view(), name='book-create'),
    path('books/<int:pk>/edit/', BookUpdateView.as_view(), name='book-update'),
    path('books/<int:pk>/delete/', BookDeleteView.as_view(), name='book-delete'),
]

# Overriding behavior with hooks like form_valid()
class BookCreateView(CreateView):
    model = Book
    fields = ['title', 'price']
    def form_valid(self, form):
        form.instance.created_by = self.request.user  # set extra field before saving
        return super().form_valid(form)

Generic CBVs common view patterns (listing, detail, create/update/delete forms) को minimal code में implement करते हैं, DRY philosophy follow करते हुए।

Generic view	उद्देश्य
ListView	Objects की list दिखाना
DetailView	एक object की details दिखाना
CreateView	Object बनाने का form
UpdateView	Object edit करने का form
DeleteView	Object delete करने की confirmation

from django.views.generic import ListView, DetailView, CreateView, UpdateView, DeleteView
from django.urls import reverse_lazy
from .models import Book

class BookListView(ListView):
    model = Book
    template_name = 'book_list.html'
    context_object_name = 'books'
    paginate_by = 10

    def get_queryset(self):
        return Book.objects.filter(available=True).order_by('title')

class BookDetailView(DetailView):
    model = Book
    template_name = 'book_detail.html'

class BookCreateView(CreateView):
    model = Book
    fields = ['title', 'author', 'price']
    template_name = 'book_form.html'
    success_url = reverse_lazy('book-list')

class BookUpdateView(UpdateView):
    model = Book
    fields = ['title', 'price']
    template_name = 'book_form.html'

class BookDeleteView(DeleteView):
    model = Book
    template_name = 'book_confirm_delete.html'
    success_url = reverse_lazy('book-list')

# form_valid() override करना
class BookCreateView(CreateView):
    model = Book
    fields = ['title', 'price']
    def form_valid(self, form):
        form.instance.created_by = self.request.user
        return super().form_valid(form)

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