feat: add CatalogSale model with abstract base classes for Sale/SaleLine

- Introduced SaleAbstractModel and SaleLineAbstractModel as abstract bases
- Added CatalogSale and CatalogSaleLine models inheriting from them
- Created migration 0045 for new models
- Added CatalogSaleView, CatalogSaleSerializer with nested line creation
- Registered new models in admin
- Added catalog_sales router endpoint to URLs
- Removed placeholder api/ package (now redundant)

tienda_ilusion/don_confiao/serializers.py

@@ -2,7 +2,13 @@ from rest_framework import serializers
 
 from .models.sales import Sale, SaleLine
 from .models.customers import Customer
-from .models.sales import Sale, SaleLine, Payment
+from .models.sales import (
+    Sale,
+    SaleLine,
+    CatalogSale,
+    CatalogSaleLine,
+    Payment,
+)
 from .models.products import Product, ProductCategory
 from .models.payments import ReconciliationJar
 
@@ -29,6 +35,44 @@ class SaleSerializer(serializers.ModelSerializer):
         ]
 
 
+class CatalogSaleLineSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = CatalogSaleLine
+        fields = [
+            "id",
+            "catalog_sale",
+            "product",
+            "unit_price",
+            "quantity",
+        ]
+
+
+class CatalogSaleSerializer(serializers.ModelSerializer):
+    catalogsaleline_set = CatalogSaleLineSerializer(
+        many=True, required=False
+    )
+    total = serializers.ReadOnlyField(source="get_total")
+
+    class Meta:
+        model = CatalogSale
+        fields = [
+            "id",
+            "customer",
+            "date",
+            "catalogsaleline_set",
+            "total",
+        ]
+
+    def create(self, validated_data):
+        lines_data = validated_data.pop("catalogsaleline_set", [])
+        catalog_sale = CatalogSale.objects.create(**validated_data)
+        for line_data in lines_data:
+            CatalogSaleLine.objects.create(
+                catalog_sale=catalog_sale, **line_data
+            )
+        return catalog_sale
+
+
 class ProductSerializer(serializers.ModelSerializer):
     class Meta:
         model = Product