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I have an app that runs on multiple servers: - locally on dev machines - on heroku - on a specific server with Passanger on Nginx
I am trying to launch a particular code (loading some REDIS keys) that is only required if the web server is launched.
I have done quite a bit of digging, and the nicest solution I found was to execute my code in an initializer with:
if defined?(Rails::Server)
#my code
end
This works well locally, but it seems that Rails::Server never gets defined either on Heroku or Passanger.
I need a solution that works in every case, please help, this is really important.
Thanks,
Alex
ps: I am running Rails 3.0.4, Ruby 1.8.7
903
Rails reads the current environment from the operating system's environment variables by checking the following in order of priority: Get the value of the RAILS_ENV environment variable by calling ENV["RAILS_ENV"] If the above is nil, then get ENV["RACK_ENV"] If the above is nil, then make it equal to "development"
Go to your browser and open http://localhost:3000, you will see a basic Rails app running. You can also use the alias "s" to start the server: bin/rails s . The server can be run on a different port using the -p option. The default development environment can be changed using -e .
One of the things rails server does is that it loads all the dependencies/gems required by your Rails app, or at least sets them up to be auto-loaded later when they are needed. This is sometimes called "booting" or loading the "Rails environment".
The configuration file config/application. rb and environment-specific configuration files (such as config/environments/production. rb ) allow you to specify the various settings that you want to pass down to all of the components. For example, you could add this setting to config/application.rb file: config.
Putting code in your config.ru file might be a more robust way of detecting server mode across different types of servers (Unicorn/Passenger/Rails::Server/etc).
e.g., in rails-root/config.ru:
# This file is used by Rack-based servers to start the application.
# ADD this line and read the value later:
ENV['server_mode'] = '1'
require ::File.expand_path...
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