Solution

author/models.py

@@ -7,3 +7,15 @@ class Author(models.Model):
     pseudonym = models.CharField(max_length=64, null=True, blank=True)
     age = models.IntegerField()
     retired = models.BooleanField()
+
+    def create(self, validated_data):
+        return Author.objects.create(**validated_data)
+
+    def update(self, instance, validated_data):
+        instance.first_name = validated_data.get("first_name", instance.first_name)
+        instance.last_name = validated_data.get("last_name", instance.last_name)
+        instance.pseudonym = validated_data.get("pseudonym", instance.pseudonym)
+        instance.age = validated_data.get("age", instance.age)
+        instance.retired = validated_data.get("retired", instance.retired)
+        instance.save()
+        return instance

author/serializers.py

@@ -1,6 +1,26 @@
 from rest_framework import serializers
 
+from author.models import Author
 
-class AuthorSerializer(serializers.ModelSerializer):
-    # write your code here
-    pass
+
+class AuthorSerializer(serializers.Serializer):
+    id = serializers.IntegerField(read_only=True)
+    first_name = serializers.CharField(max_length=64)
+    last_name = serializers.CharField(max_length=64)
+    pseudonym = serializers.CharField(max_length=64, required=False)
+    age = serializers.IntegerField()
+    retired = serializers.BooleanField()
+
+    def create(self, validated_data):
+        return Author.objects.create(**validated_data)
+
+    def update(self, instance, validated_data):
+        instance.first_name = validated_data.get("first_name", instance.first_name)
+        instance.last_name = validated_data.get("last_name", instance.last_name)
+        instance.pseudonym = validated_data.get("pseudonym", instance.pseudonym)
+        instance.age = validated_data.get("age", instance.age)
+        instance.retired = validated_data.get("retired", instance.retired)
+
+        instance.save()
+
+        return instance

author/urls.py

@@ -1,3 +1,13 @@
-# Create your urls here
+from django.urls import path, include
+from rest_framework import routers
 
-urlpatterns = []
+from author.views import AuthorViewSet
+
+router = routers.DefaultRouter()
+router.register("authors", AuthorViewSet, basename="manage")
+
+urlpatterns = [
+    path("", include(router.urls), name="authors"),
+]
+
+app_name = "author"

author/views.py

@@ -1,6 +1,11 @@
-from rest_framework import viewsets
+from rest_framework import viewsets, mixins
 
+from author.models import Author
+from author.serializers import AuthorSerializer
 
-class AuthorViewSet(viewsets.ModelViewSet):
-    # write your code here
-    pass
+
+class AuthorViewSet(
+    viewsets.ModelViewSet,
+):
+    queryset = Author.objects.all()
+    serializer_class = AuthorSerializer