How to clear file cache in Rails

Rails clear cache task

rails tmp:clear task clears the file cache.

$ rails tmp:clear # Clear cache, socket and screenshot files from tmp/ (narrow w/ tmp:cache:clear, tmp:sockets:clear, tmp:screenshots:clear)

The implementation

namespace :tmp do
  desc "Clear cache, socket and screenshot files from tmp/ (narrow w/ tmp:cache:clear, tmp:sockets:clear, tmp:screenshots:clear)"
  task clear: ["tmp:cache:clear", "tmp:sockets:clear", "tmp:screenshots:clear", "tmp:storage:clear"]
  ...
end

ref. https://github.com/rails/rails/blob/ac1d5f09e6d12679b80774872d9919cab6c34c3a/railties/lib/rails/tasks/tmp.rake#L4-L5

The each task just deletes directories inside tmp.

  namespace :cache do
    # desc "Clears all files and directories in tmp/cache"
    task :clear do
      rm_rf Dir["tmp/cache/[^.]*"], verbose: false
    end
  end

ref. https://github.com/rails/rails/blob/ac1d5f09e6d12679b80774872d9919cab6c34c3a/railties/lib/rails/tasks/tmp.rake#L17-L22

The difference between Rails.cache.clear and rails tmp:cache:clear

If you are using config.cache_store = :file_store then Rails.cache.clear will be functionally identical to rake tmp:cache:clear. However, if you’re using some other cache_store, like :memory_store or :mem_cache_store, then only Rails.cache.clear will clear your app cache.

ref. What is the difference between Rails.cache.clear and rake tmp:cache:clear? - Stack Overflow

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