👥 No duplicate authors (#198)

# Authors
- Updates `AuthorsOrderable` to disallow duplicate authors
  - Using THIS ONE `unique_together` TRICK!!!
- Updates model to require `author` field of Orderable



Closes #194

authors/migrations/0003_alter_authorsorderable_options_and_more.py

@@ -0,0 +1,22 @@
+# Generated by Django 5.0.8 on 2024-08-28 18:39
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("authors", "0002_authorsorderable"),
+        ("exhibits", "0013_alter_exhibitpage_body"),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name="authorsorderable",
+            options={},
+        ),
+        migrations.AlterUniqueTogether(
+            name="authorsorderable",
+            unique_together={("page", "author")},
+        ),
+    ]

authors/migrations/0004_alter_authorsorderable_author_and_more.py

@@ -0,0 +1,32 @@
+# Generated by Django 5.0.8 on 2024-08-29 18:48
+
+import django.db.models.deletion
+import modelcluster.fields
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("authors", "0003_alter_authorsorderable_options_and_more"),
+        ("exhibits", "0013_alter_exhibitpage_body"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="authorsorderable",
+            name="author",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE, to="authors.author"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="authorsorderable",
+            name="page",
+            field=modelcluster.fields.ParentalKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="authors",
+                to="exhibits.exhibitpage",
+            ),
+        ),
+    ]

authors/models.py

@@ -13,11 +13,13 @@
 
 
 class AuthorsOrderable(Orderable):
-    page = ParentalKey('exhibits.ExhibitPage', related_name='authors', null=True)
+
+    class Meta:
+        unique_together = ('page', 'author')
+
+    page = ParentalKey('exhibits.ExhibitPage', related_name='authors')
     author = models.ForeignKey(
         'authors.Author',
-        blank=True,
-        null=True,
         on_delete=models.CASCADE,
     )