Populated Author and Book models

eldondagdag_reading/bookshelf/admin.py

 from django.contrib import admin
-from .models import Author, Books
+from .models import Author, Book
 
 class AuthorAdmin(admin.ModelAdmin):
     model = Author
 
-class BooksAdmin(admin.ModelAdmin):
-    model = Books
+class BookAdmin(admin.ModelAdmin):
+    model = Book
 
 admin.site.register(Author, AuthorAdmin)
-admin.site.register(Books, BooksAdmin)
+admin.site.register(Book, BookAdmin)

eldondagdag_reading/bookshelf/migrations/0002_rename_books_book.py

+# Generated by Django 4.1.7 on 2023-03-28 07:50
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RenameModel(
+            old_name='Books',
+            new_name='Book',
+        ),
+    ]

eldondagdag_reading/bookshelf/migrations/0003_alter_book_isbn.py

+# Generated by Django 4.1.7 on 2023-03-28 08:11
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0002_rename_books_book'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='book',
+            name='ISBN',
+            field=models.PositiveBigIntegerField(validators=[django.core.validators.MinValueValidator(1000000000000), django.core.validators.MaxValueValidator(9999999999999)]),
+        ),
+    ]

eldondagdag_reading/bookshelf/models.py

 from django.db import models
-from django.core.validators import MinLengthValidator, MaxValueValidator
+from django.core.validators import MinValueValidator, MaxValueValidator
 
 class Author(models.Model):
     first_name = models.CharField(max_length=255, default='')
@@ -11,12 +11,12 @@ class Author(models.Model):
     def __str__(self):
         return '{} {}'.format(self.first_name, self.last_name)
 
-class Books(models.Model):
+class Book(models.Model):
     title = models.CharField(max_length=255, default='')
     author = models.ForeignKey(Author, on_delete=models.CASCADE)
     publisher = models.CharField(max_length=255, default='')
     year_published = models.PositiveIntegerField()
-    ISBN = models.PositiveBigIntegerField(validators=[MinLengthValidator(1000000000000), MaxValueValidator(9999999999999)])
+    ISBN = models.PositiveBigIntegerField(validators=[MinValueValidator(1000000000000), MaxValueValidator(9999999999999)])
     blurb = models.TextField(max_length=1000, default='')
 
     def __str__(self):