8. List

But of course, we will need to list all the books. We will do a GET where we list all the elements.

We create the appropriate tests.

# tests/libros/test_views.py

import pytest
from app.libros.models import Libros

@pytest.mark.django_db
def test_add_book(client):

    # Given
    libros = Libros.objects.all()
    assert len(libros) == 0

    # When
    resp = client.post(
        "/api/libros/",
        {
            "title": "El fin de la eternidad",
            "genre": "Ciencia Ficción",
            "author": "Isaac Asimov",
            "year": "1955",
        },
        content_type="application/json"
    )

    # Then
    assert resp.status_code == 201
    assert resp.data["title"] == "El fin de la eternidad"

    libros = Libros.objects.all()
    assert len(libros) == 1

@pytest.mark.django_db
def test_get_single_book(client):

    # Given
    libro = Libros.objects.create(
        title="El fin de la eternidad",
        genre="Ciencia Ficción",
        author="Isaac Asimov",
        year="1955",
        )

    # When
    resp = client.get(f"/api/libros/{libro.id}/")

    # Then
    assert resp.status_code == 200
    assert resp.data["title"] == "El fin de la eternidad"

@pytest.mark.django_db
def test_get_single_book_incorrect_id(client):

    # When
    resp = client.get(f"/api/libros/-1/")

    # Then
    assert resp.status_code == 404

@pytest.mark.django_db # new
def test_get_all_books(client, faker): # <- note that 'faker' is added

    # Given
    def create_random_book():
        return Libros.objects.create(
            title=faker.name(),
            genre=faker.job(),
            author=faker.name_nonbinary(),
            year=faker.year(),
        )

    libro_1 = create_random_book()
    libro_2 = create_random_book()

    # When
    resp = client.get(f"/api/libros/")

    # Then
    assert resp.status_code == 200
    assert resp.data[0]["title"] == libro_1.title
    assert resp.data[1]["title"] == libro_2.title

We create the view.

# app/libros/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 LibroSerializer
from .models import Libros

def ping(request):
    data = {"ping": "pong!"}
    return JsonResponse(data)

class LibrosList(APIView):

    def get(self, request): # new
        libros = Libros.objects.all().order_by('created_at')
        serializer = LibroSerializer(libros, many=True) # many=True to list
        return Response(serializer.data, status=status.HTTP_200_OK)

    def post(self, request):
        serializer = LibroSerializer(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 LibrosDetails(APIView):

    def get(self, request, pk):
        libro = Libros.objects.filter(pk=pk).first()
        if libro:
            serializer = LibroSerializer(libro)
            return Response(serializer.data, status=status.HTTP_200_OK)
        return Response(status=status.HTTP_404_NOT_FOUND)

There is no need to register a new route, since we will use the same one as POST, except that when using GET it will list the books.

You can run the test.