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| -- This file was automatically created by Diesel to setup helper functions | |
| -- and other internal bookkeeping. This file is safe to edit, any future | |
| -- changes will be added to existing projects as new migrations. | |
| -- Sets up a trigger for the given table to automatically set a column called | |
| -- `updated_at` whenever the row is modified (unless `updated_at` was included | |
| -- in the modified columns) | |
| -- | |
| -- # Example | |
| -- | |
| -- ```sql | |
| -- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW()); | |
| -- | |
| -- SELECT diesel_manage_updated_at('users'); | |
| -- ``` | |
| CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$ | |
| BEGIN | |
| EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s | |
| FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl); | |
| END; | |
| $$ LANGUAGE plpgsql; | |
| CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$ | |
| BEGIN | |
| IF ( | |
| NEW IS DISTINCT FROM OLD AND | |
| NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at | |
| ) THEN | |
| NEW.updated_at := current_timestamp; | |
| END IF; | |
| RETURN NEW; | |
| END; | |
| $$ LANGUAGE plpgsql; | |