подправил создание правил расписания

backend/src/main/resources/db/migration/V1__init.sql

@@ -515,7 +515,6 @@ CREATE TABLE IF NOT EXISTS schedule_rule_slots (
     day_of_week INT NOT NULL,
     parity VARCHAR(10) NOT NULL,
     time_slot_id BIGINT NOT NULL REFERENCES time_slots(id),
-    subgroup_id BIGINT NULL REFERENCES subgroups(id) ON DELETE SET NULL,
     teacher_id BIGINT NOT NULL REFERENCES users(id),
     classroom_id BIGINT NOT NULL REFERENCES classrooms(id),
     lesson_type_id BIGINT NOT NULL REFERENCES lesson_types(id),
@@ -528,34 +527,84 @@ CREATE TABLE IF NOT EXISTS schedule_rule_slots (
 CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_rule ON schedule_rule_slots(schedule_rule_id);
 CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_teacher ON schedule_rule_slots(teacher_id);
 CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_classroom ON schedule_rule_slots(classroom_id);
-CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_subgroup ON schedule_rule_slots(subgroup_id);
 CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_time ON schedule_rule_slots(day_of_week, parity, time_slot_id);
 
-CREATE OR REPLACE FUNCTION validate_schedule_rule_slot_subgroup()
+CREATE TABLE IF NOT EXISTS schedule_rule_slot_subgroups (
+    schedule_rule_slot_id BIGINT NOT NULL REFERENCES schedule_rule_slots(id) ON DELETE CASCADE,
+    subgroup_id BIGINT NOT NULL REFERENCES subgroups(id) ON DELETE CASCADE,
+    PRIMARY KEY (schedule_rule_slot_id, subgroup_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_schedule_rule_slot_subgroups_subgroup ON schedule_rule_slot_subgroups(subgroup_id);
+
+CREATE OR REPLACE FUNCTION validate_schedule_rule_slot_subgroups()
 RETURNS TRIGGER AS $$
 DECLARE
     lesson_type_name VARCHAR(50);
+    rule_id BIGINT;
+    subgroup_group_id BIGINT;
+    has_group_duplicate BOOLEAN;
 BEGIN
-    IF NEW.subgroup_id IS NULL THEN
-        RETURN NEW;
-    END IF;
-
-    SELECT name INTO lesson_type_name
-    FROM lesson_types
-    WHERE id = NEW.lesson_type_id;
+    SELECT slot.schedule_rule_id, type.name INTO rule_id, lesson_type_name
+    FROM schedule_rule_slots slot
+    JOIN lesson_types type ON type.id = slot.lesson_type_id
+    WHERE slot.id = NEW.schedule_rule_slot_id;
 
     IF lesson_type_name IS NULL OR LOWER(lesson_type_name) NOT LIKE '%лаб%' THEN
         RAISE EXCEPTION 'Подгруппы можно выбирать только для лабораторных занятий';
     END IF;
 
+    SELECT group_id INTO subgroup_group_id
+    FROM subgroups
+    WHERE id = NEW.subgroup_id;
+
+    IF subgroup_group_id IS NULL THEN
+        RAISE EXCEPTION 'Подгруппа не найдена';
+    END IF;
+
+    IF NOT EXISTS (
+        SELECT 1
+        FROM schedule_rule_groups rule_group
+        WHERE rule_group.schedule_rule_id = rule_id
+          AND rule_group.group_id = subgroup_group_id
+    ) THEN
+        RAISE EXCEPTION 'Подгруппа должна относиться к одной из групп правила';
+    END IF;
+
+    IF TG_OP = 'UPDATE' THEN
+        SELECT EXISTS (
+            SELECT 1
+            FROM schedule_rule_slot_subgroups slot_subgroup
+            JOIN subgroups subgroup ON subgroup.id = slot_subgroup.subgroup_id
+            WHERE slot_subgroup.schedule_rule_slot_id = NEW.schedule_rule_slot_id
+              AND subgroup.group_id = subgroup_group_id
+              AND NOT (
+                  slot_subgroup.schedule_rule_slot_id = OLD.schedule_rule_slot_id
+                  AND slot_subgroup.subgroup_id = OLD.subgroup_id
+              )
+        ) INTO has_group_duplicate;
+    ELSE
+        SELECT EXISTS (
+            SELECT 1
+            FROM schedule_rule_slot_subgroups slot_subgroup
+            JOIN subgroups subgroup ON subgroup.id = slot_subgroup.subgroup_id
+            WHERE slot_subgroup.schedule_rule_slot_id = NEW.schedule_rule_slot_id
+              AND subgroup.group_id = subgroup_group_id
+        ) INTO has_group_duplicate;
+    END IF;
+
+    IF has_group_duplicate THEN
+        RAISE EXCEPTION 'В одном слоте можно выбрать не больше одной подгруппы каждой группы';
+    END IF;
+
     RETURN NEW;
 END;
 $$ LANGUAGE plpgsql;
 
-CREATE TRIGGER validate_schedule_rule_slot_subgroup
-    BEFORE INSERT OR UPDATE ON schedule_rule_slots
+CREATE TRIGGER validate_schedule_rule_slot_subgroups
+    BEFORE INSERT OR UPDATE ON schedule_rule_slot_subgroups
     FOR EACH ROW
-    EXECUTE FUNCTION validate_schedule_rule_slot_subgroup();
+    EXECUTE FUNCTION validate_schedule_rule_slot_subgroups();
 
 CREATE TEMP TABLE tmp_default_rules AS
 SELECT
@@ -712,6 +761,7 @@ COMMENT ON TABLE student_group_calendar_assignments IS 'Назначения к
 COMMENT ON TABLE schedule_rules IS 'Правила динамической генерации расписания';
 COMMENT ON TABLE schedule_rule_groups IS 'Привязка правил расписания к учебным группам';
 COMMENT ON TABLE schedule_rule_slots IS 'Слоты проведения занятий внутри правила расписания';
+COMMENT ON TABLE schedule_rule_slot_subgroups IS 'Подгруппы лабораторных слотов правила расписания';
 COMMENT ON COLUMN schedule_rules.lecture_academic_hours IS 'Лимит академических часов лекций';
 COMMENT ON COLUMN schedule_rules.laboratory_academic_hours IS 'Лимит академических часов лабораторных работ';
 COMMENT ON COLUMN schedule_rules.practice_academic_hours IS 'Лимит академических часов практик';