mautrix-whatsapp/database/upgrades/2019-05-16-message-delete-cascade.go

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package upgrades
import (
"database/sql"
)
func init() {
upgrades[1] = upgrade{"Add ON DELETE CASCADE to message table", func(dialect Dialect, tx *sql.Tx, db *sql.DB) error {
if dialect == SQLite {
// SQLite doesn't support constraint updates, but it isn't that careful with constraints anyway.
return nil
}
_, err := tx.Exec("ALTER TABLE message DROP CONSTRAINT message_chat_jid_fkey")
if err != nil {
return err
}
_, err = tx.Exec(`ALTER TABLE message ADD CONSTRAINT message_chat_jid_fkey
FOREIGN KEY (chat_jid, chat_receiver) REFERENCES portal(jid, receiver)
ON DELETE CASCADE`)
if err != nil {
return err
}
return nil
}}
}