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42 lines
993 B
SQL
42 lines
993 B
SQL
DROP VIEW recipes_nestings_resolved;
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CREATE VIEW recipes_nestings_resolved
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AS
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WITH RECURSIVE r1(recipe_id, includes_recipe_id, includes_servings)
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AS (
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SELECT id, id, 1
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FROM recipes
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UNION ALL
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SELECT rn.recipe_id, r1.includes_recipe_id, rn.servings
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FROM recipes_nestings rn, r1 r1
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WHERE rn.includes_recipe_id = r1.recipe_id
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)
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SELECT
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*,
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1 AS id -- Dummy, LessQL needs an id column
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FROM r1;
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CREATE TRIGGER prevent_self_nested_recipes_INS BEFORE INSERT ON recipes_nestings
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BEGIN
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SELECT CASE WHEN((
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SELECT 1
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FROM recipes_nestings
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WHERE NEW.recipe_id = NEW.includes_recipe_id
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)
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NOTNULL) THEN RAISE(ABORT, "Recursive nested recipe detected") END;
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END;
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CREATE TRIGGER prevent_self_nested_recipes_UPD BEFORE UPDATE ON recipes_nestings
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BEGIN
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SELECT CASE WHEN((
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SELECT 1
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FROM recipes_nestings
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WHERE NEW.recipe_id = NEW.includes_recipe_id
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)
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NOTNULL) THEN RAISE(ABORT, "Recursive nested recipe detected") END;
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END;
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DELETE FROM recipes_nestings
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WHERE recipe_id = includes_recipe_id;
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