Lessons from Ruby on Rails Tutorial

=== ####Initialization

1. Run rails new _project_name_ --skip-test-unit, if you don't want to use the Unit::Test. However, you can still type rails generate rspec:install if you want RSpec for testing.
2. Modify your Gemfile to group useful gem. Use bundle install --without production to avoid future invocation of Bundler for production gems.
3. Modify config/initializers/secret_token.rb to make sure the secret token is dynamically generated. And, be sure to make the .secret file ignored by .gitignore.

def secure_token
  token_file = Rails.root.join('.secret')
  if File.exist?(token_file)
    File.read(token_file).chomp
  else
    token = SecureRandom.hex(64)
    File.write(token_file, token)
    token
  end
end
SampleApp::Application.config.secret_key_base = secret_token

####Controllers

1. Creating controller rails generate controller name(in plurals).

####Testing

1. Functional tests for testing functions. Integration test for testing the whole process flow.
2. TDD is writing tests first, before application code. By writing failing test first, implementing later and pass, to ensure the test is actually covering the functionality.