from rest_framework import viewsets, routers

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

router = routers.DefaultRouter()
router.register(r'products', ProductViewSet)

from rest_framework.permissions import BasePermission

class IsOwnerOrReadOnly(BasePermission):
    def has_object_permission(self, request, view, obj):
        if request.method in SAFE_METHODS:
            return True
        return obj.owner == request.user

class CategorySerializer(serializers.ModelSerializer):
    class Meta:
        model = Category
        fields = ['id', 'name']

class ProductSerializer(serializers.ModelSerializer):
    category = CategorySerializer()

    class Meta:
        model = Product
        fields = ['id', 'name', 'price', 'category']

from django_filters import rest_framework as filters

class ProductFilter(filters.FilterSet):
    min_price = filters.NumberFilter(field_name="price", lookup_expr='gte')
    max_price = filters.NumberFilter(field_name="price", lookup_expr='lte')

    class Meta:
        model = Product
        fields = ['category', 'in_stock']

class ProductViewSet(viewsets.ModelViewSet):
    filterset_class = ProductFilter

from rest_framework.pagination import PageNumberPagination

class StandardPagination(PageNumberPagination):
    page_size = 20
    page_size_query_param = 'page_size'
    max_page_size = 100

class BurstRateThrottle(AnonRateThrottle):
    rate = '10/min'

class SustainedRateThrottle(AnonRateThrottle):
    rate = '100/hour'

from rest_framework.versioning import URLPathVersioning

class ProductViewSet(viewsets.ModelViewSet):
    versioning_class = URLPathVersioning

# /api/v1/products/
# /api/v2/products/