create serializers for Author

author/serializers.py

@@ -1,6 +1,24 @@
 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()
+
+    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.retired = validated_data.get("retired", instance.retired)
+        instance.age = validated_data.get("age", instance.age)
+        instance.retired = validated_data.get("retired", instance.retired)
+        instance.save()
+        return instance