diff options
author | Matthias Beyer <mail@beyermatthias.de> | 2020-10-29 15:00:22 +0100 |
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committer | Matthias Beyer <mail@beyermatthias.de> | 2020-11-03 15:58:55 +0100 |
commit | 5ef71187792cb05c2834f8ff104b1ebd0c5c00b0 (patch) | |
tree | f242c297b6decfcd8c3769158dde52cb4a5c295a /migrations | |
parent | 3b335149c707072b7adcbe46afe28f992eb8033a (diff) |
Add initial diesel setup code
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
Diffstat (limited to 'migrations')
-rw-r--r-- | migrations/00000000000000_diesel_initial_setup/down.sql | 6 | ||||
-rw-r--r-- | migrations/00000000000000_diesel_initial_setup/up.sql | 36 |
2 files changed, 42 insertions, 0 deletions
diff --git a/migrations/00000000000000_diesel_initial_setup/down.sql b/migrations/00000000000000_diesel_initial_setup/down.sql new file mode 100644 index 0000000..a9f5260 --- /dev/null +++ b/migrations/00000000000000_diesel_initial_setup/down.sql @@ -0,0 +1,6 @@ +-- 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. + +DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass); +DROP FUNCTION IF EXISTS diesel_set_updated_at(); diff --git a/migrations/00000000000000_diesel_initial_setup/up.sql b/migrations/00000000000000_diesel_initial_setup/up.sql new file mode 100644 index 0000000..d68895b --- /dev/null +++ b/migrations/00000000000000_diesel_initial_setup/up.sql @@ -0,0 +1,36 @@ +-- 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; |