here we go

parks/migrations/0013_fix_null_locations.py

@@ -0,0 +1,67 @@
+from django.db import migrations
+
+def fix_null_locations(apps, schema_editor):
+    Park = apps.get_model('parks', 'Park')
+    Country = apps.get_model('cities_light', 'Country')
+    Region = apps.get_model('cities_light', 'Region')
+    City = apps.get_model('cities_light', 'City')
+    
+    # Get or create default locations
+    default_country = Country.objects.first()
+    if not default_country:
+        default_country = Country.objects.create(
+            name='Unknown',
+            name_ascii='Unknown',
+            slug='unknown',
+            geoname_id=0,
+            alternate_names='',
+            search_names='Unknown'
+        )
+    
+    default_region = Region.objects.filter(country=default_country).first()
+    if not default_region:
+        default_region = Region.objects.create(
+            name='Unknown',
+            name_ascii='Unknown',
+            slug='unknown',
+            geoname_id=0,
+            alternate_names='',
+            country=default_country,
+            display_name='Unknown',
+            search_names='Unknown'
+        )
+    
+    default_city = City.objects.filter(region=default_region).first()
+    if not default_city:
+        default_city = City.objects.create(
+            name='Unknown',
+            name_ascii='Unknown',
+            slug='unknown',
+            geoname_id=0,
+            alternate_names='',
+            region=default_region,
+            country=default_country,
+            display_name='Unknown',
+            search_names='Unknown',
+            latitude=0,
+            longitude=0,
+            population=0
+        )
+    
+    # Update parks with null locations
+    for park in Park.objects.filter(country__isnull=True):
+        park.country = default_country
+        park.region = default_region
+        park.city = default_city
+        park.location = 'Unknown, Unknown, Unknown'
+        park.save()
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('parks', '0012_merge_20241031_1635'),
+        ('cities_light', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(fix_null_locations, reverse_code=migrations.RunPython.noop),
+    ]