implemented models and customized the admin panel

sharmchua_reading/bookshelf/admin.py

 from django.contrib import admin
 
-# Register your models here.
+from .models import Author, Book
+
+class AuthorAdmin(admin.ModelAdmin):
+    model = Author
+    list_display = ('first_name', 'last_name', 'age', 'nationality', 'bio',)
+    search_fields = ('first_name', 'last_name', 'nationality',)
+    list_filter = ('first_name', 'last_name', 'age', 'nationality',)
+
+class BooksAdmin(admin.ModelAdmin):
+    model = Book
+    list_display = ('title', 'author', 'publisher', 'year_published', 'ISBN', 'blurb',)
+    search_fields = ('title', 'author', 'publisher', 'year_published', 'ISBN',)
+    list_filter = ('title', 'author', 'publisher', 'year_published',)
+
+admin.site.register(Author, AuthorAdmin)
+admin.site.register(Book, BooksAdmin)

sharmchua_reading/bookshelf/migrations/0001_initial.py

+# Generated by Django 3.2 on 2023-03-28 11:15
+
+import bookshelf.models
+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(default='', max_length=100)),
+                ('last_name', models.CharField(default='', max_length=100)),
+                ('age', models.IntegerField(default=0)),
+                ('nationality', models.CharField(default='', max_length=50, unique=True)),
+                ('bio', models.TextField(default='', 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(default='', max_length=50)),
+                ('publisher', models.CharField(default='', max_length=100)),
+                ('year_published', models.IntegerField(default=2023)),
+                ('ISBN', models.IntegerField(default=0, validators=[bookshelf.models.validate_isbn])),
+                ('blurb', models.TextField(default='', max_length=200)),
+                ('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='bookshelf.author')),
+            ],
+        ),
+    ]

sharmchua_reading/bookshelf/migrations/0002_rename_books_book.py

+# Generated by Django 3.2 on 2023-03-28 11:23
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RenameModel(
+            old_name='Books',
+            new_name='Book',
+        ),
+    ]

sharmchua_reading/bookshelf/models.py

 from django.db import models
+from django.core.exceptions import ValidationError
+
+def validate_isbn(input):
+    if len(str(input)) != 13:
+        raise ValidationError('ISBN is not 13 digits.')
+
+class Author(models.Model):
+    first_name = models.CharField(max_length=100,default="")
+    last_name = models.CharField(max_length=100,default="")
+    age = models.IntegerField(default=0)
+    nationality = models.CharField(max_length=50,unique=True,default="")
+    bio = models.TextField(max_length=700,default="")
+
+    def __str__(self):
+        return '{} {}'.format(self.first_name, self.last_name)
+
+class Book(models.Model):
+    title = models.CharField(max_length=50,default="")
+    author = models.ForeignKey(Author,on_delete=models.CASCADE)
+    publisher = models.CharField(max_length=100,default="")
+    year_published = models.IntegerField(default=2023)
+    ISBN = models.IntegerField(validators=[validate_isbn],default=0000000000000)
+    blurb = models.TextField(max_length=200,default="")
+
+    def __str__(self):
+        return '{} by {} {}'.format(self.title, self.author.first_name, self.author.last_name)
     
\ No newline at end of file
-# Create your models here.