29 lines
717 B
MySQL
29 lines
717 B
MySQL
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-- SPDX-FileCopyrightText: 2024 Simon Bruder <simon@sbruder.de>
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--
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-- SPDX-License-Identifier: AGPL-3.0-or-later
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DROP VIEW item_class_tree;
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DROP TRIGGER prevent_item_class_cycle ON item_classes;
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DROP FUNCTION check_item_class_cycle;
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CREATE FUNCTION check_item_class_recursion_depth()
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RETURNS TRIGGER AS $$
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BEGIN
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IF NEW.parent IS NULL THEN
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RETURN NEW;
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END IF;
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IF (SELECT parent FROM item_classes WHERE id = NEW.parent) IS NULL THEN
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RETURN NEW;
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END IF;
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RAISE EXCEPTION 'Item classes may only be nested one level deep';
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END;
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$$ LANGUAGE plpgsql;
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CREATE TRIGGER prevent_item_class_recursion
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BEFORE INSERT OR UPDATE ON item_classes
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FOR EACH ROW
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EXECUTE FUNCTION check_item_class_recursion_depth();
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