Low-Level Caching

Certain slow or frequently running queries or processing are cached from the classes defining them. The Workarea system follows the Rails convention in how this is handled.

core/app/models/workarea/shipping/service.rb:

def self.cache
  Rails.cache.fetch('shipping_services_cache', expires_in: Workarea.config.cache_expirations.shipping_services) do
    Shipping::Service.all.to_a
  end
end

The work to be cached is placed inside a call to the Rails.cache. Like the fragment caching in the views, if the cache store does not have a fresh cache, the block is executed and the result is cached.

Resources on Low-Level Caching

• Rails Guide: Low-Level Caching
• Heroku: Low-Level Caching