Add migration.

biscuit/apps/exlibris/migrations/0001_initial.py

+# Generated by Django 2.2.3 on 2019-07-24 21:30
+
+from django.db import migrations, models
+import django.db.models.deletion
+import isbn_field.fields
+import isbn_field.validators
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('core', '0006_auto_20190724_2326'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Book',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(max_length=50, verbose_name='Book title')),
+                ('author', models.CharField(blank=True, max_length=50, verbose_name='Author name')),
+                ('publisher', models.CharField(blank=True, max_length=50, verbose_name='Publishing company')),
+                ('edition', models.PositiveSmallIntegerField(null=True, verbose_name='Number of edition')),
+                ('year', models.PositiveSmallIntegerField(null=True, verbose_name='Publishing year')),
+                ('isbn', isbn_field.fields.ISBNField(max_length=28, unique=True, validators=[isbn_field.validators.ISBNValidator], verbose_name='ISBN number')),
+                ('cover', models.ImageField(blank=True, null=True, upload_to='', verbose_name='Photo of cover')),
+            ],
+            options={
+                'unique_together': {('title', 'author', 'edition', 'year')},
+            },
+        ),
+        migrations.CreateModel(
+            name='BookCopy',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('barcode', models.CharField(max_length=20, unique=True, verbose_name='Barcode')),
+                ('book', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='copies', to='exlibris.Book')),
+                ('borrower', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='books', to='core.Person')),
+            ],
+        ),
+    ]