allow to occupy plate positions, without samples

src/genlab_bestilling/migrations/0011_extractplateposition_notes_and_more.py

@@ -0,0 +1,29 @@
+# Generated by Django 5.1.3 on 2024-12-04 09:42
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("genlab_bestilling", "0010_remove_extractionplate_extracted_at_and_more"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="extractplateposition",
+            name="notes",
+            field=models.CharField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name="extractplateposition",
+            name="sample",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.PROTECT,
+                related_name="plate_positions",
+                to="genlab_bestilling.sample",
+            ),
+        ),
+    ]

src/genlab_bestilling/models.py

@@ -360,10 +360,15 @@ class ExtractPlatePosition(models.Model):
         "ExtractionPlate", on_delete=models.DO_NOTHING, related_name="sample_positions"
     )
     sample = models.ForeignKey(
-        "Sample", on_delete=models.PROTECT, related_name="plate_positions"
+        "Sample",
+        on_delete=models.PROTECT,
+        related_name="plate_positions",
+        null=True,
+        blank=True,
     )
     position = models.IntegerField()
     extracted_at = models.DateTimeField(auto_now=True)
+    notes = models.CharField(null=True, blank=True)
 
     # TODO: unique position per plate
     class Meta: