added bookshelf in project's installed apps, made migrations and registered models in admin

bellapanghulan_reading/bellapanghulan_reading/settings.py

@@ -36,6 +36,7 @@ ALLOWED_HOSTS = []
 # Application definition
 
 INSTALLED_APPS = [
+    'bookshelf.apps.BookshelfConfig',
     'django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',

bellapanghulan_reading/bookshelf/admin.py

 from django.contrib import admin
-
+from .models import Author, Books
 # Register your models here.
+class AuthorAdmin(admin.ModelAdmin):
+    model = Author
+    list_display = ('first_name', 'last_name', 'age', 'nationality', 'bio')
+    search_fields = ['first_name', 'last_name',]
+    list_filter = ('first_name', 'last_name',)
+
+class BooksAdmin(admin.ModelAdmin):
+    model = Books
+    list_display = ('title', 'author', 'publisher', 'year_published', 'ISBN', 'blurb')
+    search_fields = ['title', 'author', 'publisher', 'ISBN']
+    list_filter = ('author', 'publisher', 'year_published',)
+
+admin.site.register(Author, AuthorAdmin)
+admin.site.register(Books, BooksAdmin)
\ No newline at end of file

bellapanghulan_reading/bookshelf/migrations/0001_initial.py

+# Generated by Django 4.1.3 on 2023-03-27 05:12
+
+import bookshelf.models
+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=50)),
+                ('last_name', models.CharField(max_length=50)),
+                ('age', models.IntegerField(default=0)),
+                ('nationality', models.CharField(max_length=50)),
+                ('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=100)),
+                ('publisher', models.CharField(max_length=100)),
+                ('year_published', models.DateTimeField(verbose_name='date published')),
+                ('ISBN', models.CharField(max_length=13, validators=[bookshelf.models.Books.validate_ISBN])),
+                ('blurb', models.TextField(max_length=200, validators=[django.core.validators.MinLengthValidator(100)])),
+                ('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='bookshelf.author')),
+            ],
+        ),
+    ]

bellapanghulan_reading/bookshelf/models.py

 from django.db import models
 from django.core.exceptions import ValidationError
+from django.core.validators import MinLengthValidator
 
 # Create your models here.
 class Author(models.Model):
@@ -14,17 +15,19 @@ class Author(models.Model):
 
 class Books(models.Model):
     title = models.CharField(max_length = 100)
-    author = models.ForeignKey(Author, on_delete=models.CASCADE)
+    author = models.ForeignKey(Author, on_delete = models.CASCADE)
     publisher = models.CharField(max_length = 100)
     year_published = models.DateTimeField('date published')
-    ISBN = models.CharField(max_length=13, validators=[validate_ISBN])
-    blurb = models.TextField(max_length = 200, min_length = 100)
     
     def validate_ISBN(value):
         if len(value) != 13:
             raise ValidationError('Must be exactly 13 digits.')
         if not value.isdigit():
             raise ValidationError('Must only be digits.')
+
+    ISBN = models.CharField(max_length=13, validators=[validate_ISBN])
+    blurb = models.TextField(max_length = 200, validators=[MinLengthValidator(100)])
+    
     
     def __str__(self):
         return self.title
\ No newline at end of file