lesson 69

api/serializers.py

+from rest_framework import serializers
+
+from web.models import StatusChoices, Article
+
+
+class ArticleSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Article
+        fields = ['id', 'title', 'text', 'author', 'status', 'created_at', 'updated_at']
+        read_only_fields = ['author', 'id', 'created_at', 'updated_at']
+
+
+class ArticlePartialUpdateSerializer(serializers.ModelSerializer):
+    title = serializers.CharField(max_length=200, required=False)
+    text = serializers.CharField(max_length=3000, required=False)
+
+    class Meta:
+        model = Article
+        fields = ['id', 'title', 'text', 'author', 'status', 'created_at', 'updated_at']
+
+
+class ArticleSerializerOld(serializers.Serializer):
+    id = serializers.IntegerField(read_only=True)
+    title = serializers.CharField(max_length=200, required=True)
+    text = serializers.CharField(max_length=3000, required=True)
+    author = serializers.PrimaryKeyRelatedField(read_only=True)
+    status = serializers.ChoiceField(choices=StatusChoices.choices, required=False)
+    created_at = serializers.DateTimeField(read_only=True)
+    updated_at = serializers.DateTimeField(read_only=True)
+
+    def create(self, validated_data):
+        return Article.objects.create(**validated_data)
+
+    def update(self, instance, validated_data):
+        for k, v in validated_data.items():
+            setattr(instance, k, v)
+
+        instance.save()
+        return instance

api/urls.py

@@ -4,5 +4,6 @@ from api import views
 
 urlpatterns = [
     path('echo', views.echo_view),
-    path('articles', views.articles_view),
+    path('articles', views.ArticlesView.as_view()),
+    path('articles/<int:id_>', views.ArticleUpdateView.as_view())
 ]

api/views.py

 import json
 
-from django import http
-from django.core.serializers import serialize, deserialize
-from django.http import JsonResponse, HttpResponse
+from django.http import JsonResponse
+from rest_framework.views import APIView
+
 from datetime import datetime
 
 from django.views.decorators.csrf import ensure_csrf_cookie
 
+from api import serializers
 from web.models import Article
 
 
@@ -26,20 +27,44 @@ def echo_view(request, *args, **kwargs):
     return JsonResponse(answer)
 
 
-def articles_view(request, *args, **kwargs):
-    if request.method == 'GET':
-        qs = Article.objects.values()
-        return JsonResponse(list(qs), safe=False)
+class ArticlesView(APIView):
+    def get(self, request, *args, **kwargs):
+        qs = Article.objects.all()
+        serializer = serializers.ArticleSerializer(qs, many=True)
+        return JsonResponse(serializer.data, safe=False)
 
-    elif request.method == 'POST':
+    def post(self, request, *args, **kwargs):
+        data = json.loads(request.body)
+        serializer = serializers.ArticleSerializer(data=data)
+
+        if serializer.is_valid():
+            serializer.save()
+            return JsonResponse(serializer.data, safe=False)
+
+        else:
+            return JsonResponse(status=400, data={'errors': serializer.error_messages})
 
-        if request.body:
-            try:
-                article = Article.objects.create(**json.loads(request.body))
-            except TypeError:
-                return http.HttpResponseBadRequest('invalid request body')
 
-            return JsonResponse({'id': article.id, 'title': article.title, 'text': article.text})
+class ArticleUpdateView(APIView):
+    def update(self, request, id_, partial: bool = True):
+        serializer = serializers.ArticleSerializer
 
+        if partial:
+            serializer = serializers.ArticlePartialUpdateSerializer
+
+        instance = Article.objects.get(id=id_)
+
+        data = json.loads(request.body)
+        serializer = serializer(data=data, instance=instance)
+
+        if serializer.is_valid():
+            serializer.save()
+            return JsonResponse(serializer.data, safe=True)
         else:
-            return JsonResponse(status=400, data={'error': 'No data provided!'})
+            return JsonResponse(status=400, data={'errors': serializer.error_messages})
+
+    def put(self, request, id_: int, *args, **kwargs):
+        return self.update(request, id_, partial=False)
+
+    def patch(self, request, id_, *args, **kwargs):
+        return self.update(request, id_)

core/settings.py

@@ -40,7 +40,8 @@ INSTALLED_APPS = [
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'django_extensions',
-
+    
+    'rest_framework',
     'web',
     'accounts',
     'api',

reqs.txt

@@ -7,6 +7,7 @@ curtsies==0.4.1
 cwcwidth==0.1.8
 Django==3.2.19
 django-extensions==3.2.3
+djangorestframework==3.14.0
 greenlet==2.0.2
 idna==3.4
 Pillow==10.0.0