Rails cache expire

Question

I have a rails application, in that I am using simple rails cache. My testing is as follows:

Rails.cache.write(\'temp\',Date.today,:expires_in => 60.seconds)
         


        

Answer 1

You should use fetch method with do block instead of Rails.cache.write. Even though the name is "fetch", it writes to the cache if you put inside do block. You also do not need to clear cache entry manually, just use the "fetch" with expires_in and race_condition_ttl. Keep the ttl value under expiry time and keep it as small as possible.

output_json = Rails.cache.fetch('temp',expires_in: 1.minute,race_condition_ttl:3) do
  my_expansive_operation().to_json
end