MIGRATION VERS GITEA

migrations/repair_horaires_fk.sql

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+-- Migration: repair foreign key between horaires_gares_desservies.horaire_id and horaires.id
+-- This script will:
+-- 1) check the column types of horaires.id and horaires_gares_desservies.horaire_id
+-- 2) if types match and FK doesn't exist, create the FK constraint
+-- 3) otherwise, print a NOTICE explaining the mismatch for manual resolution
+
+DO $$
+DECLARE
+  t_horaire TEXT;
+  t_horaire_fk TEXT;
+  cnt INT;
+BEGIN
+  -- ensure target tables exist
+  IF NOT EXISTS (SELECT 1 FROM pg_class WHERE relname = 'horaires' AND relkind = 'r') THEN
+    RAISE NOTICE 'Table public.horaires does not exist in this database/schema.';
+    RETURN;
+  END IF;
+  IF NOT EXISTS (SELECT 1 FROM pg_class WHERE relname = 'horaires_gares_desservies' AND relkind = 'r') THEN
+    RAISE NOTICE 'Table public.horaires_gares_desservies does not exist in this database/schema.';
+    RETURN;
+  END IF;
+
+  -- get formatted types
+  SELECT pg_catalog.format_type(a.atttypid, a.atttypmod)
+    INTO t_horaire
+    FROM pg_attribute a
+    WHERE a.attrelid = 'public.horaires'::regclass AND a.attname = 'id';
+
+  SELECT pg_catalog.format_type(a.atttypid, a.atttypmod)
+    INTO t_horaire_fk
+    FROM pg_attribute a
+    WHERE a.attrelid = 'public.horaires_gares_desservies'::regclass AND a.attname = 'horaire_id';
+
+  RAISE NOTICE 'Detected types -> horaires.id: %, horaires_gares_desservies.horaire_id: %', t_horaire, t_horaire_fk;
+
+  -- check existing FK from horaires_gares_desservies to horaires
+  SELECT count(*) INTO cnt
+    FROM pg_constraint c
+    WHERE c.conrelid = 'public.horaires_gares_desservies'::regclass
+      AND c.confrelid = 'public.horaires'::regclass
+      AND c.contype = 'f';
+
+  IF cnt > 0 THEN
+    RAISE NOTICE 'A foreign-key constraint from horaires_gares_desservies to horaires already exists (count=%). No action taken.', cnt;
+    RETURN;
+  END IF;
+
+  -- If types match, create the FK
+  IF t_horaire IS NOT NULL AND t_horaire_fk IS NOT NULL AND t_horaire = t_horaire_fk THEN
+    EXECUTE 'ALTER TABLE public.horaires_gares_desservies
+             ADD CONSTRAINT fk_horaires_gares_horaire_id
+             FOREIGN KEY (horaire_id)
+             REFERENCES public.horaires(id)
+             ON DELETE CASCADE';
+    RAISE NOTICE 'Foreign key constraint fk_horaires_gares_horaire_id created successfully.';
+  ELSE
+    RAISE NOTICE 'Column types do not match or could not be determined. Manual intervention required.';
+    RAISE NOTICE 'Detected types -> horaires.id: %, horaires_gares_desservies.horaire_id: %', t_horaire, t_horaire_fk;
+    RAISE NOTICE 'If both should be UUID, consider converting [or recreating] the columns and then re-run this script.';
+    RAISE NOTICE 'If both should be BIGINT, consider altering types to bigint. Do not run automatic conversion without backup.';
+  END IF;
+END $$;