fix(models): allow generic foreign key to be empty

apis_instance_nsvis/migrations/0002_alter_mongodbmodel_content_type_and_more.py

@@ -0,0 +1,25 @@
+# Generated by Django 5.1.2 on 2024-11-11 09:26
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('apis_instance_nsvis', '0001_initial'),
+        ('contenttypes', '0002_remove_content_type_name'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='mongodbmodel',
+            name='content_type',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='contenttypes.contenttype'),
+        ),
+        migrations.AlterField(
+            model_name='mongodbmodel',
+            name='object_id',
+            field=models.PositiveIntegerField(null=True),
+        ),
+    ]

apis_instance_nsvis/models.py

@@ -17,8 +17,8 @@ class NsvisMixin:
 class MongoDbModel(models.Model):
     data = models.JSONField()
     filename = models.TextField(blank=False, max_length=32)
-    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
-    object_id = models.PositiveIntegerField()
+    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE, null=True)
+    object_id = models.PositiveIntegerField(null=True)
     content_object = GenericForeignKey("content_type", "object_id")