google_api_caching.rb

def fetch_events(start, end, timezone)
  Rails.cache.fetch(cache_key, expires_in: 1.hour.from_now) do 
    GoogleClient.fetch_events     
  end
end

def cache_key
  [
    start,
    end,
    timezone,
    current_user.cache_key,
  ].join("-")  
end