fix: Make unique school names migration

cfl_common/common/migrations/0048_unique_school_names.py

@@ -0,0 +1,32 @@
+# Generated by Django 3.2.20 on 2023-11-06 18:56
+
+from django.apps.registry import Apps
+from django.db import migrations, models
+
+
+def unique_school_names(apps: Apps, *args):
+    School = apps.get_model("common", "School")
+
+    schools = School.objects.values("name").annotate(name_count=models.Count("name")).filter(name_count__gt=1)
+    for school in schools:
+        schools = list(School.objects.filter(name=school["name"]).order_by("id"))
+        for index in range(school["name_count"]):
+            if index > 0:
+                school = schools[index]
+                school.name += f" {index + 1}"
+                school.save()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("common", "0047_delete_school_postcode"),
+    ]
+
+    operations = [
+        migrations.RunPython(code=unique_school_names, reverse_code=migrations.RunPython.noop),
+        migrations.AlterField(
+            model_name="school",
+            name="name",
+            field=models.CharField(max_length=200, unique=True),
+        ),
+    ]