fixed admin panel, modified and populated models for bookshelf

nicsdevega_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
-    list_dsiplay = ("first_name","last_name","age","nationality","bio")
-    search_fields = ("first_name","last_names")
+    list_display = ("first_name","last_name","age","nationality","bio")
+    search_fields = ("first_name","last_name")
     list_filter = ("first_name","last_name","nationality")
 
-class BooksAdmin(admin.ModelAdmin):
-    model = Books
+class BookAdmin(admin.ModelAdmin):
+    model = Book
     list_display = ("title","author","publisher","year_published","ISBN","blurb")
     search_fields = ("title","author","publisher","year_published","ISBN")
     list_filter = ("author","publisher","year_published")
 
 
 admin.site.register(Author,AuthorAdmin)
-admin.site.register(Books,BooksAdmin)
+admin.site.register(Book,BookAdmin)

nicsdevega_reading/bookshelf/migrations/0002_alter_author_age_alter_books_isbn_alter_books_blurb_and_more.py

+# Generated by Django 4.1.7 on 2023-03-28 06:19
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='author',
+            name='age',
+            field=models.PositiveIntegerField(),
+        ),
+        migrations.AlterField(
+            model_name='books',
+            name='ISBN',
+            field=models.IntegerField(default=0, validators=[django.core.validators.MaxValueValidator(9999999999999)]),
+        ),
+        migrations.AlterField(
+            model_name='books',
+            name='blurb',
+            field=models.TextField(default='', max_length=700, validators=[django.core.validators.MinLengthValidator(100)]),
+        ),
+        migrations.AlterField(
+            model_name='books',
+            name='year_published',
+            field=models.IntegerField(validators=[django.core.validators.MaxValueValidator(2023)]),
+        ),
+    ]

nicsdevega_reading/bookshelf/migrations/0003_rename_books_book.py

+# Generated by Django 4.1.7 on 2023-03-28 06:37
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0002_alter_author_age_alter_books_isbn_alter_books_blurb_and_more'),
+    ]
+
+    operations = [
+        migrations.RenameModel(
+            old_name='Books',
+            new_name='Book',
+        ),
+    ]

nicsdevega_reading/bookshelf/migrations/0004_alter_book_isbn_alter_book_year_published.py

+# Generated by Django 4.1.7 on 2023-03-28 07:47
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0003_rename_books_book'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='book',
+            name='ISBN',
+            field=models.IntegerField(validators=[django.core.validators.MaxValueValidator(9999999999999), django.core.validators.MinValueValidator(1000000000000)]),
+        ),
+        migrations.AlterField(
+            model_name='book',
+            name='year_published',
+            field=models.PositiveIntegerField(validators=[django.core.validators.MaxValueValidator(2023)]),
+        ),
+    ]

nicsdevega_reading/bookshelf/migrations/0005_alter_book_isbn.py

+# Generated by Django 4.1.7 on 2023-03-28 07:51
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0004_alter_book_isbn_alter_book_year_published'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='book',
+            name='ISBN',
+            field=models.IntegerField(unique=True, validators=[django.core.validators.MaxValueValidator(9999999999999), django.core.validators.MinValueValidator(1000000000000)]),
+        ),
+    ]

nicsdevega_reading/bookshelf/models.py

 from django.db import models
+from django.core.validators import MinValueValidator,MaxValueValidator, MinLengthValidator
 
-class Author (models.Model):
+class Author(models.Model):
     first_name = models.CharField(max_length=100,default="")
     last_name = models.CharField(max_length=100,default="")
-    age = models.IntegerField()
+    age = models.PositiveIntegerField()
     nationality = models.CharField(max_length=100,default="")
     bio = models.TextField(max_length=700,default="")
     
     def __str__(self):
         return '{} {}'.format(self.first_name, self.last_name)
 
-class Books(models.Model):
+class Book(models.Model):
     title = models.CharField(max_length=100,default="")
     author = models.ForeignKey(Author,on_delete=models.CASCADE)
     publisher = models.CharField(max_length=100, default="")
-    year_published = models.IntegerField(default=0)
-    ISBN = models.IntegerField(default=0)
-    blurb = models.TextField(max_length=700,default ="")
+    year_published = models.PositiveIntegerField(validators=[MaxValueValidator(2023)])
+    ISBN = models.IntegerField(unique=True, validators=[MaxValueValidator(9999999999999),MinValueValidator(1000000000000)])
+    blurb = models.TextField(validators=[MinLengthValidator(100)],max_length=700,default ="")
     
     def __str__(self):
         return '{} by {}'.format(self.title, self.author)
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