What are the components and structure of ViewSet in Django REST Framework?

A ViewSet in Django REST Framework is a class that combines the logic for handling HTTP requests for a set of related actions (e.g., CRUD) on a model.

Main components of a ViewSet:

• queryset — the set of model objects that the ViewSet operates on.
• serializer_class — the serializer class that converts model objects to JSON and back.
• action methods — methods corresponding to HTTP operations, such as list(), create(), retrieve(), update(), destroy().

ViewSet allows reducing code duplication by automatically linking URLs to methods via routers.

Example of a simple ViewSet:

from rest_framework import viewsets
from .models import Product
from .serializers import ProductSerializer

class ProductViewSet(viewsets.ModelViewSet):
    queryset = Product.objects.all()
    serializer_class = ProductSerializer

Here, ModelViewSet provides a full set of actions for the Product model.