在capistrano deploy.rb中加载app_config.yml

Question

Using Rails 3.2 and Capistrano 2. I have an app_config.yml which I load to the app this way:

# config/app_config.yml
global: &GLOBAL
  sitename: Shop

# config/application.rb
require File.expand_path('../boot', __FILE__)
APP_CONFIG = YAML.load_file(File.expand_path('../app_config.yml', __FILE__))[Rails.env]

# call using this method
<%= APP_CONFIG["sitename"] %>

I want to load the same app_config.yml in my deployment scripts in Capistrano, so that I don't have to re-set the variables again:

# config/deploy.rb
require "bundler/capistrano"

require File.expand_path('../boot', __FILE__)
APP_CONFIG = YAML.load_file(File.expand_path('../app_config.yml', __FILE__))[Rails.env]

set :stages, %w(production staging)

And I hope to access the variable using this way too: APP_CONFIG["sitename"] , but as I run the deployment script, I get this error:

./config/deploy.rb:4:in `load': uninitialized constant Capistrano::Configuration::Rails
(NameError) # points to the APP_CONFIG = YAML.load_file... line

How can I load the app_config.yml file correctly?

Answer 1

capistrano does not require any rails code.

that's why calling APP_CONFIG = YAML.load_file(File.expand_path('../app_config.yml', __FILE__))[Rails.env] raises the exception.

you need to replace the Rails.env with something else that is used in your capistrano deployment. that might be the stage or just "production" depending on your setup.