feat : adds sorting and filtering features to the products fetching API (#224)

* adds django filters to the REST_FRAMEWORK config

* adds the core logic for filtering and sorting

Author: Kushdapush

backend/core/settings/base.py

@@ -47,7 +47,12 @@
 REST_FRAMEWORK = {
     'DEFAULT_AUTHENTICATION_CLASSES': (
         'rest_framework_simplejwt.authentication.JWTAuthentication',
-    )
+    ),
+    'DEFAULT_FILTER_BACKENDS': [
+        'django_filters.rest_framework.DjangoFilterBackend',
+        'rest_framework.filters.SearchFilter',
+        'rest_framework.filters.OrderingFilter',
+    ],
 }
 
 MIDDLEWARE = [

backend/products/views.py

@@ -1,12 +1,42 @@
 from rest_framework.generics import ListAPIView, RetrieveAPIView
+from rest_framework.filters import SearchFilter, OrderingFilter
+from django_filters.rest_framework import DjangoFilterBackend
+from django_filters import rest_framework as filters
 
 from .models import Product
 from .serializers import ProductSerializer
 
+class ProductFilter(filters.FilterSet):
+    # simple text filters
+    name = filters.CharFilter(lookup_expr='icontains')
+    seller = filters.CharFilter(lookup_expr='icontains')
+    tags = filters.CharFilter(lookup_expr='icontains')
+    type = filters.CharFilter(lookup_expr='icontains')
+    
+    # price range filters
+    min_price = filters.NumberFilter(field_name="price", lookup_expr='gte')
+    max_price = filters.NumberFilter(field_name="price", lookup_expr='lte')
+    
+    # exact match filters
+    category = filters.ChoiceFilter(choices=[('clothing', 'Clothing'), ('rsvp', 'RSVP')])
+    color = filters.CharFilter(lookup_expr='iexact')
+    size = filters.CharFilter(lookup_expr='iexact')
+
+    class Meta:
+        model = Product
+        fields = ['name', 'seller', 'tags', 'type', 'category', 'color', 'size']
+
 class ListProductView(ListAPIView):
     queryset = Product.objects.all()
     serializer_class = ProductSerializer
+    filter_backends = [DjangoFilterBackend, SearchFilter, OrderingFilter]
+    filterset_class = ProductFilter
+    
+    search_fields = ['name', 'description', 'tags', 'seller', 'type']
+    
+    ordering_fields = ['name', 'price', 'created_at', 'seller']
+    ordering = ['-created_at']
 
 class RetrieveProductView(RetrieveAPIView):
     queryset = Product.objects.all()
-    serializer_class = ProductSerializer
+    serializer_class = ProductSerializer