populated data using admin panel

chrisolivares_reading/bookshelf/migrations/0003_alter_books_blurb_alter_books_publisher.py

+# Generated by Django 4.1.7 on 2023-03-28 11:35
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0002_alter_books_year_published'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='books',
+            name='blurb',
+            field=models.TextField(max_length=400, validators=[django.core.validators.MinLengthValidator(100)]),
+        ),
+        migrations.AlterField(
+            model_name='books',
+            name='publisher',
+            field=models.CharField(default='', max_length=200),
+        ),
+    ]

chrisolivares_reading/bookshelf/migrations/0004_alter_books_isbn.py

+# Generated by Django 4.1.7 on 2023-03-28 11:40
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0003_alter_books_blurb_alter_books_publisher'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='books',
+            name='ISBN',
+            field=models.PositiveBigIntegerField(validators=[django.core.validators.MinLengthValidator(13), django.core.validators.MaxLengthValidator(13)]),
+        ),
+    ]

chrisolivares_reading/bookshelf/migrations/0005_alter_books_isbn.py

+# Generated by Django 4.1.7 on 2023-03-28 11:45
+
+import django.core.validators
+from django.db import migrations, models
+import re
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookshelf', '0004_alter_books_isbn'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='books',
+            name='ISBN',
+            field=models.CharField(default='0000000000000', max_length=13, validators=[django.core.validators.RegexValidator(re.compile('^\\d+(?:\\d+)*\\Z'), code='invalid', message=None), django.core.validators.MinLengthValidator(13)]),
+        ),
+    ]

chrisolivares_reading/bookshelf/models.py

 from django.db import models
 from django.urls import reverse
-from django.core.validators import MinLengthValidator,MinValueValidator,MaxValueValidator
+from django.core.validators import MinLengthValidator,MaxLengthValidator,MaxValueValidator, int_list_validator
 import datetime
 
 class Author(models.Model):
@@ -19,22 +19,23 @@ class Author(models.Model):
 
 
 class Books(models.Model):
-    title = models.TextField(max_length=200, default='')
+    title = models.CharField(max_length=200, default='')
     author = models.ForeignKey(
         Author,
         on_delete=models.PROTECT,
     )
-    publisher = models.TextField(max_length=200, default='')
+    publisher = models.CharField(max_length=200, default='')
     #Source:https://stackoverflow.com/questions/1517474/only-showing-year-in-django-admin-a-yearfield-instead-of-datefield
     year_published = models.IntegerField(validators=[MaxValueValidator(datetime.datetime.now().year)], default = datetime.datetime.now().year)
     
-    #Source: https://stackoverflow.com/questions/30849862/django-max-length-for-integerfield
-    ISBN = models.PositiveBigIntegerField(validators=[MinValueValidator(1000000000000), MaxValueValidator(9999999999999)])
-    blurb = models.TextField(validators=[MinLengthValidator(100)], max_length=200)
+    #Source: https://stackoverflow.com/questions/57131043/how-to-make-integer-field-fixed-to-ten-numbers-output-in-models
+    ISBN = models.CharField(max_length=13, validators=[int_list_validator(sep=''),MinLengthValidator(13),], default='0000000000000')
+
+    blurb = models.TextField(validators=[MinLengthValidator(100)], max_length=400)
 
 
     def __str__(self):
-        return '{}, {} mode'.format(self.title, self.author)
+        return '{} by {}'.format(self.title, self.author)
 
     def get_absolute_url(self):
         return reverse('location_detail', args=[str(self.title)])