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Decrement position after deletion

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This commit is contained in:
Hongbo Wu 2022-07-28 18:00:55 +08:00
parent bac33e887c
commit 0959085c9d
1 changed files with 9 additions and 4 deletions
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13
packages/db/migrations/0090.do.add_position_to_labels.sql
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@ -4,7 +4,7 @@
BEGIN;
ALTER TABLE omnivore.labels ADD COLUMN position INTEGER NOT NULL DEFAULT 0;
ALTER TABLE omnivore.labels ADD COLUMN position integer NOT NULL DEFAULT 0;
WITH positions AS (
SELECT
@ -29,16 +29,21 @@ CREATE OR REPLACE FUNCTION update_label_position()
UPDATE omnivore.labels SET position = position - 1 WHERE user_id = OLD.user_id AND position > OLD.position;
RETURN OLD;
ELSIF (TG_OP = 'INSERT') THEN
SELECT MAX(position) + 1 INTO new_position FROM omnivore.labels WHERE user_id = NEW.user_id;
SELECT COALESCE(MAX(position), 0) + 1 INTO new_position FROM omnivore.labels WHERE user_id = NEW.user_id;
NEW.position = new_position;
RETURN NEW;
END IF;
END;
$$ LANGUAGE 'plpgsql';
CREATE TRIGGER update_label_position
BEFORE INSERT OR DELETE ON omnivore.labels
CREATE TRIGGER increment_label_position
BEFORE INSERT ON omnivore.labels
FOR EACH ROW
EXECUTE FUNCTION update_label_position();
CREATE TRIGGER decrement_label_position
AFTER DELETE ON omnivore.labels
FOR EACH ROW
EXECUTE FUNCTION update_label_position();
COMMIT;