Rails state_machine not working on staging environment

Question

gem list state*

*** LOCAL GEMS ***
state_machine (1.1.2)

In the console on my development environment:

>> require 'state_machine'
=> []

In my staging environment:

>> require 'state_machine'
=> false

Both environments have the same state_machine (1.1.2).

Does anyone know why?

Answer 1

First, if require returns false, it means only that the file has already been successfully loaded.

Are you using bundler to manage gems? Assuming a Rails 3 app, this is the default, and you should most definitely use it. If you have a separate environment (using the Rails meaning of "environment") for staging, then be sure your Gemfile.rb lists the state_machine gem for all environments. Finally, in order for changes to the Gemfile.rb to take effect, you must run bundle install before it will be available within Rails.