Generates a new secret token in a Rails app

rails_generate_secret_token.sh

# This oneliner generates a new secret_token.rb file, 
# just paste it in your terminal at the root of your project
# and it will take care of the rest.
echo "$(rails r "p Rails.application.class.parent_name" | sed "s/\"//g")::Application.config.secret_token = '$(rake secret)'" > ./config/initializers/secret_token.rb

Explanation:

It echoes the entire contents of what needs to be in secret_token.rb into that file.

First it finds out the name of the application, couldn't find a simple way to do this but this is what the

rails r "p Rails.application.class.parent_name"

is for, piping to sed just to remove the quotes.

rake secret actually generates the token value.

You can also run the no-magic version and just replace MyApp with the name of your app.

echo "MyApp::Application.config.secret_token = '$(rake secret)'" > ./config/initializers/secret_token.rb