core/apps/api/serializers/ad/home_api.py

@@ -16,9 +16,10 @@ class AdVariantSerializer(serializers.ModelSerializer):
 
 
 class BaseHomeAdSerializer(serializers.ModelSerializer):
-    variants = serializers.SerializerMethodField()
     star = serializers.SerializerMethodField()
     comment_count = serializers.SerializerMethodField()
+    price = serializers.SerializerMethodField()
+    discount = serializers.SerializerMethodField()
 
     class Meta:
         model = AdModel
@@ -29,14 +30,25 @@ class BaseHomeAdSerializer(serializers.ModelSerializer):
             "image",
             "star",
             "comment_count",
-            "variants",
+            "discount",
         ]
 
-    def get_variants(self, obj):
+    def _get_first_variant(self, obj):
-        variant = obj.variants.order_by("price").first()
+        if not hasattr(self, "_variant_cache"):
-        if variant:
+            self._variant_cache = {}
-            return AdVariantSerializer(variant).data
+        if obj.id not in self._variant_cache:
-        return []
+            self._variant_cache[obj.id] = obj.variants.order_by("price").first()
+        return self._variant_cache[obj.id]
+
+    def get_price(self, obj):
+        variant = self._get_first_variant(obj)
+        if not variant:
+            return obj.price
+        return variant.price if variant else 0
+
+    def get_discount(self, obj):
+        variant = self._get_first_variant(obj)
+        return variant.discount if variant else 0
 
     def get_star(self, obj):
         avg = obj.feedback.aggregate(avg=Avg("star"))["avg"]