Migrated and populated all models, fixed ISBN validator for Books

justinreyes_reading/bookshelf/admin.py

 from django.contrib import admin
-from models import Author, Books
+from .models import Author, Books
 
 
 class AuthorAdmin(admin.ModelAdmin):
     model = Author
     list_display = (
-        "first_name",
         "last_name",
+        "first_name",
         "age",
         "nationality",
-        "bio",
+        "shortened_bio",
     )
     search_fields = (
         "first_name",
@@ -17,6 +17,11 @@ class AuthorAdmin(admin.ModelAdmin):
     )
     list_filter = ("nationality",)
 
+    def shortened_bio(self, obj):
+        return obj.bio[:50] + "..."
+
+    shortened_bio.short_description = "Biography"
+
 
 class BooksAdmin(admin.ModelAdmin):
     model = Books

justinreyes_reading/bookshelf/migrations/0001_initial.py

+# Generated by Django 4.1.7 on 2023-03-27 06:15
+
+import django.core.validators
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Author',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('first_name', models.CharField(max_length=255)),
+                ('last_name', models.CharField(max_length=255)),
+                ('age', models.PositiveIntegerField()),
+                ('nationality', models.CharField(max_length=255)),
+                ('bio', models.TextField(max_length=700)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Books',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(max_length=255)),
+                ('publisher', models.CharField(default='Unknown', max_length=255)),
+                ('year_published', models.IntegerField(default=0)),
+                ('isbn', models.PositiveBigIntegerField(validators=[django.core.validators.MaxLengthValidator(13)])),
+                ('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='bookshelf.author')),
+            ],
+        ),
+    ]

justinreyes_reading/bookshelf/migrations/0002_alter_books_isbn.py

+# Generated by Django 4.1.7 on 2023-03-27 06:55
+
+import bookshelf.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='books',
+            name='isbn',
+            field=models.PositiveBigIntegerField(validators=[bookshelf.models.validate_isbn]),
+        ),
+    ]

justinreyes_reading/bookshelf/models.py

 from django.db import models
-from django.core.validators import MaxLengthValidator
+from django.core.exceptions import ValidationError
+
+
+def validate_isbn(value):
+    if len(str(value)) != 13:
+        raise ValidationError("ISBN must be exactly 13 digits long.")
 
 
 class Author(models.Model):
@@ -21,7 +26,7 @@ class Books(models.Model):
         default="Unknown",
     )
     year_published = models.IntegerField(default=0)
-    isbn = models.PositiveBigIntegerField(validators=[MaxLengthValidator(13)])
+    isbn = models.PositiveBigIntegerField(validators=[validate_isbn])
 
     def __str__(self):
         return self.title

justinreyes_reading/justinreyes_reading/settings.py

@@ -20,7 +20,7 @@ BASE_DIR = Path(__file__).resolve().parent.parent
 # See https://docs.djangoproject.com/en/4.1/howto/deployment/checklist/
 
 # SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = 'django-insecure-#$_y3fdp-jxw7@e54b&d)b1966h7g!@$#8#mk$@lqnq0_or((v'
+SECRET_KEY = "django-insecure-#$_y3fdp-jxw7@e54b&d)b1966h7g!@$#8#mk$@lqnq0_or((v"
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
@@ -31,52 +31,53 @@ ALLOWED_HOSTS = []
 # Application definition
 
 INSTALLED_APPS = [
-    'django.contrib.admin',
-    'django.contrib.auth',
-    'django.contrib.contenttypes',
-    'django.contrib.sessions',
-    'django.contrib.messages',
-    'django.contrib.staticfiles',
+    "django.contrib.admin",
+    "django.contrib.auth",
+    "django.contrib.contenttypes",
+    "django.contrib.sessions",
+    "django.contrib.messages",
+    "django.contrib.staticfiles",
+    "bookshelf",
 ]
 
 MIDDLEWARE = [
-    'django.middleware.security.SecurityMiddleware',
-    'django.contrib.sessions.middleware.SessionMiddleware',
-    'django.middleware.common.CommonMiddleware',
-    'django.middleware.csrf.CsrfViewMiddleware',
-    'django.contrib.auth.middleware.AuthenticationMiddleware',
-    'django.contrib.messages.middleware.MessageMiddleware',
-    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+    "django.middleware.security.SecurityMiddleware",
+    "django.contrib.sessions.middleware.SessionMiddleware",
+    "django.middleware.common.CommonMiddleware",
+    "django.middleware.csrf.CsrfViewMiddleware",
+    "django.contrib.auth.middleware.AuthenticationMiddleware",
+    "django.contrib.messages.middleware.MessageMiddleware",
+    "django.middleware.clickjacking.XFrameOptionsMiddleware",
 ]
 
-ROOT_URLCONF = 'justinreyes_reading.urls'
+ROOT_URLCONF = "justinreyes_reading.urls"
 
 TEMPLATES = [
     {
-        'BACKEND': 'django.template.backends.django.DjangoTemplates',
-        'DIRS': [],
-        'APP_DIRS': True,
-        'OPTIONS': {
-            'context_processors': [
-                'django.template.context_processors.debug',
-                'django.template.context_processors.request',
-                'django.contrib.auth.context_processors.auth',
-                'django.contrib.messages.context_processors.messages',
+        "BACKEND": "django.template.backends.django.DjangoTemplates",
+        "DIRS": [],
+        "APP_DIRS": True,
+        "OPTIONS": {
+            "context_processors": [
+                "django.template.context_processors.debug",
+                "django.template.context_processors.request",
+                "django.contrib.auth.context_processors.auth",
+                "django.contrib.messages.context_processors.messages",
             ],
         },
     },
 ]
 
-WSGI_APPLICATION = 'justinreyes_reading.wsgi.application'
+WSGI_APPLICATION = "justinreyes_reading.wsgi.application"
 
 
 # Database
 # https://docs.djangoproject.com/en/4.1/ref/settings/#databases
 
 DATABASES = {
-    'default': {
-        'ENGINE': 'django.db.backends.sqlite3',
-        'NAME': BASE_DIR / 'db.sqlite3',
+    "default": {
+        "ENGINE": "django.db.backends.sqlite3",
+        "NAME": BASE_DIR / "db.sqlite3",
     }
 }
 
@@ -86,16 +87,16 @@ DATABASES = {
 
 AUTH_PASSWORD_VALIDATORS = [
     {
-        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
     },
     {
-        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+        "NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
     },
     {
-        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+        "NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",
     },
     {
-        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+        "NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",
     },
 ]
 
@@ -103,9 +104,9 @@ AUTH_PASSWORD_VALIDATORS = [
 # Internationalization
 # https://docs.djangoproject.com/en/4.1/topics/i18n/
 
-LANGUAGE_CODE = 'en-us'
+LANGUAGE_CODE = "en-us"
 
-TIME_ZONE = 'UTC'
+TIME_ZONE = "Asia/Manila"
 
 USE_I18N = True
 
@@ -115,9 +116,9 @@ USE_TZ = True
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/4.1/howto/static-files/
 
-STATIC_URL = 'static/'
+STATIC_URL = "static/"
 
 # Default primary key field type
 # https://docs.djangoproject.com/en/4.1/ref/settings/#default-auto-field
 
-DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
+DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"