.railsrc file ?
File should place in user home directory
Here you can add some default commands like
=>rails new [options]
This options values, you can add in this file.
-d postgresql --skip-test-unit
If you added “-d postgresql” in .railsrc after that, whenever creating new application the default database must be postgresql.
If you want to skip unit testing, you can add “–skip-test-unit”, it will skip always unit testing.