creación de vistas genericas para app ecommerce

Se utilizan viewsets del framework.
registro de vistas genericas en router del urls.py del sitio.

README.md

@@ -479,7 +479,7 @@ ej. **HTTPie**
 
 ```sh
 http post http://127.0.0.1:8000/api-token-auth/ username=<tu-usuario> \
-                                                  password=<tu-password>
+                                                password=<tu-password>
 ```
 
 ```http
@@ -499,7 +499,7 @@ X-Frame-Options: DENY
 }
 ```
 
-## Ecommerce Model
+### Ecommerce Model
 
 Esta app hace uso obligatorio del token de autentificación. Solo usuarios
 autentificados pueden acceder a este endpoint.
@@ -518,3 +518,22 @@ Registro de app en el panel de [administración](./backend/ecommerce/admin.py).
 
 Migraciones `./manage.py makemigrations` y `./manage.py migrate`.
 
+### Ecommerce Views y URLs
+
+Creación de [views](./backend/ecommerce/views.py) de la app, se utiliza
+`IsAuthenticated` del framework.
+Se agrega conjunto de vistas genericas de la app en [urls.py](./backend/drf_course/urls.py)
+del sitio, registrandolas en el `router`.
+
+```py
+...
+from ecommerce import views as ecommerce_views
+...
+
+router = routers.DefaultRouter()
+router.register(r'item', ecommerce_views.ItemViewSet, basename='item')
+router.register(r'order', ecommerce_views.OrderViewSet, basename='order')
+
+...
+```
+

backend/drf_course/urls.py

@@ -1,10 +1,13 @@
 from django.contrib import admin
 from django.urls import path
 from core import views as core_views
+from ecommerce import views as ecommerce_views
 from rest_framework import routers
 from rest_framework.authtoken.views import obtain_auth_token
 
 router = routers.DefaultRouter()
+router.register(r'item', ecommerce_views.ItemViewSet, basename='item')
+router.register(r'order', ecommerce_views.OrderViewSet, basename='order')
 
 urlpatterns = router.urls
 

backend/ecommerce/views.py

@@ -1,3 +1,60 @@
-from django.shortcuts import render
+from json import JSONDecodeError
+from django.http import JsonResponse
+from .serializers import ItemSerializer, OrderSerializer
+from .models import Item , Order
+from rest_framework.parsers import JSONParser
+from rest_framework.permissions import IsAuthenticated
+from rest_framework import viewsets, status
+from rest_framework.response import Response
+from rest_framework.mixins import (
+        ListModelMixin,
+        UpdateModelMixin,
+        RetrieveModelMixin
+    )
 
-# Create your views here.
+
+class ItemViewSet(
+        ListModelMixin,
+        RetrieveModelMixin,
+        viewsets.GenericViewSet
+        ):
+    """
+    Conjunto de vistas simples para listar o recibir items.
+    """
+    permission_classes = (IsAuthenticated,)
+    queryset = Item.objects.all()
+    serializer_class = ItemSerializer
+
+class OrderViewSet(
+        ListModelMixin,
+        RetrieveModelMixin,
+        UpdateModelMixin,
+        viewsets.GenericViewSet
+        ):
+    """
+    Conjunto de vistas simples para listar, recibir y crear pedidos.
+    """
+    permission_classes = (IsAuthenticated,)
+    serializer_class = OrderSerializer
+
+    def get_queryset(self):
+        """
+        Retorna lista con todas las ordenes del usuario autentificado.
+        """
+        user = self.request.user
+        return Order.objects.filter(user = user)
+
+    def create(self, request):
+        try:
+            data = JSONParser().parse(request)
+            serializer = OrderSerializer(data=data)
+            if serializer.is_valid(raise_exception=True):
+                item = Item.objects.get(pk = data["item"])
+                order = item.place_order(request.user, data["quantity"])
+                return Response(OrderSerializer(order).data)
+            else:
+                return Response(serializer.errors,
+                                status=status.HTTP_400_BAD_REQUEST)
+        except JSONDecodeError:
+            return JsonResponse({"result": "error","message": "Json decoding error"},
+                                status= 400)