Best Way to Define API keys for Rails application

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First Create a YML file inside the config folder of the application


your_file_name.yml 
development: 
api_key: "your api key"
secret_key: "your secret key"


Then create a file in config/initializers folder , for example load_keys.rb and paste the following code inside that
load_keys.rb 
APP_CONFIG = YAML.load_file("#{RAILS_ROOT}/config/your_file_name.yml")[RAILS_ENV]

Now you can use these inside your application 
APP_CONFIG['api_key']
APP_CONFIG['secret_key']

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