Add model Libros y serializadores

app/libros/migrations/0002_libros.py

@@ -0,0 +1,30 @@
+# Generated by Django 3.2.5 on 2021-07-09 16:33
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('libros', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Libros',
+            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': 'Libro',
+                'verbose_name_plural': 'Libros',
+                'ordering': ('-created_at',),
+            },
+        ),
+    ]

app/libros/models.py

@@ -1,6 +1,25 @@
-from django.db import models
+# app/libros/models.py
+
 from django.contrib.auth.models import AbstractUser
+from django.db import models
 
 
 class CustomUser(AbstractUser):
-    pass
+    pass
+
+
+class Libros(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 = "Libro"
+        verbose_name_plural = "Libros"
+
+    def __str__(self):
+        return self.title

app/libros/serializers.py

@@ -0,0 +1,15 @@
+# app/libros/serializers.py
+
+from rest_framework import serializers
+from .models import Libros
+
+
+class LibroSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Libros
+        fields = "__all__"
+        read_only_fields = (
+            "id",
+            "created_date",
+            "updated_date",
+        )

tests/libros/test_create_model.py

@@ -0,0 +1,29 @@
+# tests/libros/test_create_model.py
+
+import pytest
+
+from app.libros.models import Libros
+
+@pytest.mark.django_db
+def test_libros_model():
+
+    ## Given
+    # Creamos un nuevo libro en la base de datos
+    libro = Libros(
+        title="La fundación",
+        genre="Ciencia ficción",
+        year="1951",
+        author="Isaac Asimov",
+    )
+    libro.save()
+
+    ## When
+
+    ## Then
+    assert libro.title == "La fundación"
+    assert libro.genre == "Ciencia ficción"
+    assert libro.year == "1951"
+    assert libro.author == "Isaac Asimov"
+    assert libro.created_at
+    assert libro.updated_at
+    assert str(libro) == libro.title

tests/libros/test_serializers.py

@@ -0,0 +1,31 @@
+# tests/libros/test_serializers.py
+
+from app.libros.serializers import LibroSerializer
+
+def test_valid_libro_serializer():
+    valid_serializer_data = {
+        "title": "Raising Arizona",
+        "genre": "comedy",
+        "year": "1987",
+        "author": "Ray Bradbury",
+    }
+    serializer = LibroSerializer(data=valid_serializer_data)
+    assert serializer.is_valid()
+    assert serializer.validated_data == valid_serializer_data
+    assert serializer.data == valid_serializer_data
+    assert serializer.errors == {}
+
+
+def test_invalid_libro_serializer():
+    invalid_serializer_data = {
+        "title": "Soy Leyenda",
+        "author": "Richard Matheson",
+    }
+    serializer = LibroSerializer(data=invalid_serializer_data)
+    assert not serializer.is_valid()
+    assert serializer.validated_data == {}
+    assert serializer.data == invalid_serializer_data
+    assert serializer.errors == {
+        "year": ["This field is required."],
+        "genre": ["This field is required."],
+    }