#51 feat: serializadores de categorias y categorias anidadas en productos

Issue #51: discriminacion y administracion de categorias de productos.

- ProductCategorySerializer (name/external_id read_only)
- ProductCategoryBriefSerializer para el JSON de productos
- ProductSerializer.categories ahora devuelve objetos anidados

tienda_ilusion/don_confiao/tests/test_product_categories.py

@@ -1,6 +1,6 @@
 from django.test import TestCase
 
-from ..models.products import ProductCategory
+from ..models.products import Product, ProductCategory
 
 
 class TestProductCategoryModel(TestCase):
@@ -22,4 +22,56 @@ class TestProductCategoryModel(TestCase):
         category = ProductCategory.objects.create(name="Granos")
         self.assertTrue(category.active)
         self.assertEqual(category.description, "")
-        self.assertIsNone(category.alternative_name)
+        self.assertIsNone(category.alternative_name)
+
+
+class TestProductCategorySerializers(TestCase):
+    def test_product_category_serializer_devuelve_campos_don_confiao(self):
+        from ..serializers import ProductCategorySerializer
+
+        category = ProductCategory.objects.create(
+            name="Bebidas",
+            external_id="8",
+            description="Bebidas naturales",
+            alternative_name="Jugos",
+            active=False,
+        )
+        data = ProductCategorySerializer(category).data
+        self.assertEqual(
+            data,
+            {
+                "id": category.pk,
+                "name": "Bebidas",
+                "external_id": "8",
+                "description": "Bebidas naturales",
+                "alternative_name": "Jugos",
+                "active": False,
+            },
+        )
+
+    def test_product_serializer_incluye_categorias_anidadas(self):
+        from ..serializers import ProductSerializer
+
+        category = ProductCategory.objects.create(
+            name="Bebidas", external_id="8", alternative_name="Jugos"
+        )
+        product = Product.objects.create(
+            name="Jugo de naranja",
+            price=2500,
+            measuring_unit="UNIT",
+            external_id="10",
+        )
+        product.categories.add(category)
+
+        data = ProductSerializer(product).data
+        self.assertEqual(
+            data["categories"],
+            [
+                {
+                    "id": category.pk,
+                    "name": "Bebidas",
+                    "alternative_name": "Jugos",
+                    "active": True,
+                }
+            ],
+        )