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app/library/admin.py

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

app/library/apps.py

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+from django.apps import AppConfig
+
+
+class LibrosConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "app.library"

app/library/migrations/0001_initial.py

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+# Generated by Django 3.2.5 on 2021-07-14 14:16
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Book',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(max_length=255)),
+                ('genre', models.CharField(max_length=255)),
+                ('year', models.CharField(max_length=4)),
+                ('author', models.CharField(max_length=255)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'verbose_name': 'Book',
+                'verbose_name_plural': 'Books',
+                'ordering': ('created_at',),
+            },
+        ),
+    ]

app/library/models.py

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+# app/Library/models.py
+
+from django.db import models
+
+
+class Book(models.Model):
+    title = models.CharField(max_length=255)
+    genre = models.CharField(max_length=255)
+    year = models.CharField(max_length=4)
+    author = models.CharField(max_length=255)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        ordering = ("created_at",)
+        verbose_name = "Book"
+        verbose_name_plural = "Books"
+
+    def __str__(self):
+        return self.title

app/library/serializers.py

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+# app/Library/serializers.py
+
+from rest_framework import serializers
+from .models import Book
+
+
+class BookSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Book
+        fields = "__all__"
+        read_only_fields = (
+            "id",
+            "created_at",
+            "updated_at",
+        )

app/library/urls.py

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+# app/Library/urls.py
+
+from django.urls import path
+from app.library.views import ping, BookList, BookDetails
+
+
+urlpatterns = [
+    path("ping/", ping, name="ping"),
+    path("api/book/", BookList.as_view(), name="book_list"),
+    path("api/book/<int:pk>/", BookDetails.as_view(), name="book_details"),
+]

app/library/views.py

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+# app/Library/views.py
+
+from django.http import JsonResponse
+from rest_framework.views import APIView
+from rest_framework.response import Response
+from rest_framework import status
+from .serializers import BookSerializer
+from .models import Book
+
+
+def ping(request):
+    data = {"ping": "pong!"}
+    return JsonResponse(data)
+
+
+class BookList(APIView):
+    def get(self, request):
+        books = Book.objects.all()
+        serializer = BookSerializer(books, many=True)
+        return Response(serializer.data, status=status.HTTP_200_OK)
+
+    def post(self, request):
+        serializer = BookSerializer(data=request.data)
+        if serializer.is_valid():
+            serializer.save()
+            return Response(serializer.data, status=status.HTTP_201_CREATED)
+        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
+
+
+class BookDetails(APIView):
+    def get(self, request, pk):
+        book = Book.objects.filter(pk=pk).first()
+        if book:
+            serializer = BookSerializer(book)
+            return Response(serializer.data, status=status.HTTP_200_OK)
+        return Response(status=status.HTTP_404_NOT_FOUND)
+
+    def put(self, request, pk):
+        book = Book.objects.filter(pk=pk).first()
+        serializer = BookSerializer(book, data=request.data)
+        if serializer.is_valid():
+            serializer.save()
+            return Response(serializer.data, status=status.HTTP_200_OK)
+        elif not book:
+            return Response(serializer.data, status=status.HTTP_404_NOT_FOUND)
+        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
+
+    def delete(self, request, pk):
+        book = Book.objects.filter(pk=pk).first()
+        if book:
+            serializer = BookSerializer(book)
+            book.delete()
+            return Response(serializer.data, status=status.HTTP_200_OK)
+        return Response(status=status.HTTP_404_NOT_FOUND)