ruby on rails - using figaro to store env variables -

i'm confused how use figaro rails 4.2. in application.yml (which checked .gitignore), have this:

secret_key_base: 123456

and in secrets.yml, have this:

development:   secret_key_base: <%= env["secret_key_base"] %> 

the gem should handling env part of setting credentials, according i've read. why not working?

edit 1: in application.yml have: mandrill_user_name: email@example.com , mandrill_password: 1234567890

and in development.rb have:

config.action_mailer.default_url_options = { :host => "localhost:3000" }  config.action_mailer.smtp_settings = {   address: "smtp.mandrillapp.com",   port: 587,   domain: "localhost:3000",   authentication: "plain",   enable_starttls_auto: true,   user_name: env["mandrill_user_name"],   password: env["mandrill_password"] } 

shouldn't application.yml taking care of this?

if redundant have variable in secrets.yml file , application.yml file. i.e. use application.yml file declare env vars.

so long in apllication.yml file can call throughout rails app doing:

env["secret_key_base"] 

varialbles stored in secrets.yml file called via

rails.application.secrets.secret_key_base