issue #1146 - rename index for old deployments

snpdb/migrations/0145_one_off_handle_renamed_table_inherited_index.py

@@ -0,0 +1,30 @@
+# Generated by Django 4.2.15 on 2024-09-09 07:09
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('snpdb', '0144_add_vgc_descriptions'),
+    ]
+
+    operations = [
+        # We need to explicitly inherit sequences now (see RelatedModelsPartitionModel)
+        # and when Django renames tables it doesn't rename indexes, so we need to rename it in old deployments
+        migrations.RunSQL(sql="""
+            DO $$
+            BEGIN
+                -- Check if the sequence exists
+                IF EXISTS (SELECT 1 FROM pg_class WHERE relname = 'snpdb_variantcount_id_seq' AND relkind = 'S') THEN
+                    -- Rename the sequence
+                    ALTER SEQUENCE snpdb_variantcount_id_seq RENAME TO snpdb_cohortgenotype_id_seq;
+                    
+                    -- Update the table's column default to use the new sequence name
+                    ALTER TABLE snpdb_cohortgenotype
+                    ALTER COLUMN id
+                    SET DEFAULT nextval('snpdb_cohortgenotype_id_seq'::regclass);
+                END IF;
+            END $$;
+        """, reverse_sql=migrations.RunSQL.noop)
+    ]