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    <p>There are a couple of common practices to handle this situation if you don't want to use Git hooks or other methods to modify the actual code upon deploy.</p> <p><strong>Environment Based Configuration</strong></p> <p>If you don't mind having the production values your configuration settings in your repository, you can make them environment based. I sometimes use something like this:</p> <pre><code># config/application.yml default: facebook: app_id: app_id_for_dev_and_test app_secret: app_secret_for_dev_and_test api_key: api_key_for_dev_and_test production: facebook: app_id: app_id_for_production app_secret: app_secret_for_production api_key: api_key_for_production # config/initializers/app_config.rb require 'yaml' yaml_data = YAML::load(ERB.new(IO.read(File.join(Rails.root, 'config', 'application.yml'))).result) config = yaml_data["default"] begin config.merge! yaml_data[Rails.env] rescue TypeError # nothing specified for this environment; do nothing end APP_CONFIG = HashWithIndifferentAccess.new(config) </code></pre> <p>Now you can access the data via, for instance, <code>APP_CONFIG[:facebook][:app_id]</code>, and the value will automatically be different based on which environment the application was booted in.</p> <p><strong>Environment Variables Based Configuration</strong></p> <p>Another option is to specify production data via environment variables. Heroku allows you to do this via <a href="http://devcenter.heroku.com/articles/config-vars" rel="nofollow">config vars</a>.</p> <ol> <li><p>Set up your code to use a value based on the environment (maybe with optional defaults):</p> <pre><code>facebook_app_id = ENV['FB_APP_ID'] || 'some default value' </code></pre></li> <li><p>Create the production config var on Heroku by typing on a console:</p> <pre><code>heroku config:add FB_APP_ID=the_fb_app_id_to_use </code></pre></li> </ol> <p>Now <code>ENV['FB_APP_ID']</code> is <code>the_fb_app_id_to_use</code> on production (Heroku), and <code>'some default value'</code> in development and test.</p> <p>The Heroku documentation linked above has some more detailed information on this strategy.</p>
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    1. COFor now, this is the solution that I've gone with. It works great. Thank-you. Also, the description of HashWithIndifferentAccess is hilarious, if you haven't seen it: http://as.rubyonrails.org/classes/HashWithIndifferentAccess.html
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