It should be SchedulesController, not Users::ScheduleController. Controllers should only be namespaced when the route is namespaced with namespace. Controller names should also always be plural. What you’re creating is a nested resource, not a namespaced one.
The rake task only clears out files that are stored on the filesystem in “#{Rails.root}/tmp/cache”. Here’s the code for that task. https://github.com/rails/rails/blob/ef5d85709d346e55827e88f53430a2cbe1e5fb9e/railties/lib/rails/tasks/tmp.rake#L25-L30 Rails.cache.clear will do different things depending on your apps setting for config.cache_store. http://guides.rubyonrails.org/caching_with_rails.html#cache-stores 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. … Read more