Solution

author/serializers.py

@@ -1,6 +1,37 @@
 from rest_framework import serializers
 
 
+from author.models import Author
+
+
 class AuthorSerializer(serializers.ModelSerializer):
-    # write your code here
-    pass
+    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()
+
+    class Meta:
+        model = Author
+        fields = ["id",
+                  "first_name",
+                  "last_name",
+                  "pseudonym",
+                  "age",
+                  "retired"]
+
+    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 +1,27 @@
-# 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="author-list")
+
+author_list = AuthorViewSet.as_view(
+    actions={"get": "list",
+             "post": "create"}
+)
+
+author_detail = AuthorViewSet.as_view(
+    actions={"get": "retrieve",
+             "put": "update",
+             "patch": "partial_update",
+             "delete": "destroy"}
+)
+
+urlpatterns = [
+    path("", include(router.urls)),
+]
+
+app_name = "author"

author/views.py

@@ -1,6 +1,10 @@
 from rest_framework import viewsets
 
 
+from author.models import Author
+from author.serializers import AuthorSerializer
+
+
 class AuthorViewSet(viewsets.ModelViewSet):
-    # write your code here
-    pass
+    queryset = Author.objects.all()
+    serializer_class = AuthorSerializer