How can I clear rails cache after deploy to heroku?

Question

I applied cache to my heroku rails app and it works well. But everytime I deploy to heroku, I also want to clear cache automatically.

so I googled and I found this

Answer 1

Heroku doesn't currently support a pipeline of actions to occur after deployment. You'll need something like Codeship or TravisCI to create a recipe of steps that happen during deployment

Disclosure: I am a customer of Codeship.

Answer 2

Rails has a built in rake task:

rake tmp:clear

Answer 3

heroku run rake tmp:cache:clear

http://guides.rubyonrails.org/command_line.html#tmp

Answer 4

The following should work on cedar:

heroku run console

..then wait 5 seconds for heroku console to boot

Rails.cache.clear

Then you should see the cache clear, and you can quit console. Remember you might have to refresh a few times because your local machine will often cache assets and such in your browser until it makes a fresh request.

If it happens to be assets that you're caching though, you don't need to go through a manual clear every time you push, you just need to have the asset pipeline set up and make sure all your js/css(less/sass)/static images are being compiled with hashes at the end of their filenames.

Answer 5

You should be able to create a cache clearing rake task that looks something like this:

namespace :cache do
  desc "Clears Rails cache"
  task :clear => :environment do
    Rails.cache.clear
  end
end

and invoke it directly in one command that you can use in your post deploy hook - like so:

heroku run rake cache:clear

Answer 6

Ruby on Rails has a magical ENV variable called 'RAILS_CACHE_ID'. I set this to the git commit id whenever I deploy: heroku config:set RAILS_CACHE_ID=$CIRCLE_SHA1