From 260cc74111fe60796782d39a6daa16bad69c28a4 Mon Sep 17 00:00:00 2001
From: "Roberto.silva" <Roberto.silva@lasalle.mx>
Date: Tue, 17 Mar 2026 12:55:11 -0600
Subject: [PATCH] Aplicar migraciones de asignatura fix #63

---
 .../20260317184516_remote_schema.sql          |  3 +
 .../20260317185334_migraciones_asignatura.sql | 72 +++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 supabase/migrations/20260317184516_remote_schema.sql
 create mode 100644 supabase/migrations/20260317185334_migraciones_asignatura.sql

diff --git a/supabase/migrations/20260317184516_remote_schema.sql b/supabase/migrations/20260317184516_remote_schema.sql
new file mode 100644
index 0000000..5d0873b
--- /dev/null
+++ b/supabase/migrations/20260317184516_remote_schema.sql
@@ -0,0 +1,3 @@
+create extension if not exists "pgjwt" with schema "extensions";
+
+
diff --git a/supabase/migrations/20260317185334_migraciones_asignatura.sql b/supabase/migrations/20260317185334_migraciones_asignatura.sql
new file mode 100644
index 0000000..64d53b3
--- /dev/null
+++ b/supabase/migrations/20260317185334_migraciones_asignatura.sql
@@ -0,0 +1,72 @@
+drop extension if exists "pgjwt";
+
+alter table "public"."asignaturas" add column "prerrequisito_asignatura_id" uuid;
+
+CREATE INDEX asignaturas_prerrequisito_idx ON public.asignaturas USING btree (prerrequisito_asignatura_id);
+
+alter table "public"."asignaturas" add constraint "asignaturas_prerrequisito_asignatura_id_fkey" FOREIGN KEY (prerrequisito_asignatura_id) REFERENCES public.asignaturas(id) ON DELETE SET NULL not valid;
+
+alter table "public"."asignaturas" validate constraint "asignaturas_prerrequisito_asignatura_id_fkey";
+
+alter table "public"."asignaturas" add constraint "asignaturas_prerrequisito_self_check" CHECK (((prerrequisito_asignatura_id IS NULL) OR (prerrequisito_asignatura_id <> id))) not valid;
+
+alter table "public"."asignaturas" validate constraint "asignaturas_prerrequisito_self_check";
+
+set check_function_bodies = off;
+
+CREATE OR REPLACE FUNCTION public.validar_prerrequisito_asignatura()
+ RETURNS trigger
+ LANGUAGE plpgsql
+AS $function$
+declare
+  v_plan uuid;
+  v_ciclo integer;
+begin
+
+  if new.prerrequisito_asignatura_id is null then
+    return new;
+  end if;
+
+  select
+    plan_estudio_id,
+    numero_ciclo
+  into
+    v_plan,
+    v_ciclo
+  from public.asignaturas
+  where id = new.prerrequisito_asignatura_id;
+
+  if not found then
+    raise exception
+      'La asignatura prerrequisito no existe';
+  end if;
+
+  if v_plan <> new.plan_estudio_id then
+    raise exception
+      'El prerrequisito debe pertenecer al mismo plan de estudio';
+  end if;
+
+  if new.numero_ciclo is null then
+    raise exception
+      'La asignatura debe tener numero_ciclo definido';
+  end if;
+
+  if v_ciclo is null then
+    raise exception
+      'El prerrequisito debe tener numero_ciclo definido';
+  end if;
+
+  if v_ciclo >= new.numero_ciclo then
+    raise exception
+      'El prerrequisito debe pertenecer a un ciclo menor';
+  end if;
+
+  return new;
+
+end;
+$function$
+;
+
+CREATE TRIGGER trg_validar_prerrequisito_asignatura BEFORE INSERT OR UPDATE OF prerrequisito_asignatura_id, numero_ciclo, plan_estudio_id ON public.asignaturas FOR EACH ROW EXECUTE FUNCTION public.validar_prerrequisito_asignatura();
+
+