Added some logic

backend/apps/books/admin.py

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+from django.contrib import admin
+
+# Register your models here.

backend/apps/books/apps.py

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+from django.apps import AppConfig
+
+
+class BooksConfig(AppConfig):
+    name = 'apps.books'

backend/apps/books/models.py

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+from django.db import models
+
+from apps.shelves.models import Shelf
+from apps.authors.models import Author
+from apps.user.models import User
+
+class Book(models.Model):
+    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="Authors")
+    authors = models.ManyToManyField(Author, related_name="books")
+    name = models.CharField(max_length=255)
+    isbn = models.CharField(max_length=13)

backend/apps/books/serializers.py

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+from rest_framework import serializers
+
+from apps.books.models import Book
+from apps.shelves.serializers import ShelfSerializer
+from apps.shelves.models import Shelf
+
+class BookSerializer(serializers.ModelSerializer):
+    #shelf = ShelfSerializer(read_only=True)
+    #shelf_id = serializers.PrimaryKeyRelatedField(
+        #queryset=Shelf.objects.all(),
+        #source="shelf", 
+        #write_only=True
+    #)
+    
+    
+    class Meta: 
+        model = Book
+        fields = [
+            "id",
+            "name",
+            "isbn", 
+            #"shelf",
+            #"shelf_id"
+        ]
+        read_only_fields = ["id"]

backend/apps/books/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

backend/apps/books/urls.py

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+from rest_framework.routers import DefaultRouter
+
+from apps.books.views import BooksViewSet
+
+urlpatterns = []
+
+router = DefaultRouter()
+router.register("", viewset=BooksViewSet)
+urlpatterns += router.urls

backend/apps/books/views.py

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+from rest_framework import viewsets
+
+from apps.books.models import Book
+from apps.books.serializers import BookSerializer
+from rest_framework import viewsets 
+from rest_framework.permissions import IsAuthenticated
+from rest_framework_simplejwt.authentication import JWTAuthentication
+
+class BooksViewSet(viewsets.ModelViewSet):
+    queryset = Book.objects.prefetch_related("authors")
+    serializer_class = BookSerializer 
+
+    authentication_classes = [JWTAuthentication]
+    permission_classes = [IsAuthenticated]
+
+    def get_queryset(self):
+        return self.queryset.filter(
+            shelf__user_id=self.request.user.pk
+        )