discourse/db/migrate/20200117172135_add_trigger_...

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# frozen_string_literal: true
class AddTriggerToSyncPostReplies < ActiveRecord::Migration[6.0]
def up
# we don't want this column to be readonly yet
Migration::ColumnDropper.drop_readonly(:post_replies, :reply_id)
DB.exec <<~SQL
CREATE OR REPLACE FUNCTION post_replies_sync_reply_id()
RETURNS trigger AS $rcr$
BEGIN
NEW.reply_post_id := NEW.reply_id;
RETURN NEW;
END
$rcr$ LANGUAGE plpgsql;
SQL
DB.exec <<~SQL
CREATE TRIGGER post_replies_reply_id_sync
BEFORE INSERT OR UPDATE OF reply_id ON post_replies
FOR EACH ROW
WHEN (NEW.reply_id IS NOT NULL)
EXECUTE PROCEDURE post_replies_sync_reply_id();
SQL
# one more sync because we could be missing some data from the time between the
# "20200116140132_rename_reply_id_column" migration and now
execute <<~SQL
UPDATE post_replies
SET reply_post_id = reply_id
WHERE reply_post_id IS NULL
SQL
end
def down
raise ActiveRecord::IrreversibleMigration
end
end