Rails will use that particular setting to configure Active Record.
h4. Rails General Configuration
* +config.cache_classes+ controls whether or not application classes should be reloaded on each request.
* +config.cache_classes+ controls whether or not application classes should be reloaded on each request. Defaults to _true_ in development, _false_ in test and production.
* +config.cache_store+ configures which cache store to use for Rails caching. Options include +:memory_store+, +:file_store+, +:mem_cache_store+ or the name of your own custom class.