How to clear cache Rails file?

Question

Im running Rails 4.2.7 on Ubuntu 14.04. I wrote the following method for caching some data (preventing getting into my PostGres 9.5 database) ...

class Country < ActiveRecord::Base has_many :states def self.cached_find_by_iso(iso) Rails.cache.fetch("#{iso}") do find_by_iso(iso) end end end 

However, even after running rake tmp: cache: to clear and restart my server, I get this error when trying to call the above ...

 Error during processing: Not a directory @ rb_file_s_rename - (/home/rails/myproject/tmp/cache/00020161104-1093-67j634, /home/rails/myproject/tmp/cache/001/000/) /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/fileutils.rb:528:in `rename' /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/fileutils.rb:528:in `block in mv' /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/fileutils.rb:1571:in `block in fu_each_src_dest' /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/fileutils.rb:1587:in `fu_each_src_dest0' /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/fileutils.rb:1569:in `fu_each_src_dest' /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/fileutils.rb:517:in `mv' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/core_ext/file/atomic.rb:36:in `atomic_write' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/cache/file_store.rb:83:in `write_entry' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/cache/strategy/local_cache.rb:115:in `write_entry' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/cache.rb:391:in `block in write' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/cache.rb:547:in `block in instrument' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/notifications.rb:166:in `instrument' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/cache.rb:547:in `instrument' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/cache.rb:389:in `write' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/cache.rb:588:in `save_block_result_to_cache' /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/cache.rb:299:in `fetch' /home/rails/myproject/app/models/country.rb:5:in `cached_find_by_iso' /home/rails/myproject/app/services/all_events_guide_service.rb:84:in `block in process_page_data' /usr/local/rvm/gems/ruby-2.3.0/gems/nokogiri-1.6.8.1/lib/nokogiri/xml/node_set.rb:187:in `block in each' /usr/local/rvm/gems/ruby-2.3.0/gems/nokogiri-1.6.8.1/lib/nokogiri/xml/node_set.rb:186:in `upto' /usr/local/rvm/gems/ruby-2.3.0/gems/nokogiri-1.6.8.1/lib/nokogiri/xml/node_set.rb:186:in `each' /home/rails/myproject/app/services/all_events_guide_service.rb:45:in `process_page_data' /home/rails/myproject/app/services/abstract_import_service.rb:83:in `process_my_object_data' /home/rails/myproject/app/services/all_events_guide_my_object_finder_service.rb:103:in `block in process_my_object_link' /usr/local/rvm/gems/ruby-2.3.0/gems/nokogiri-1.6.8.1/lib/nokogiri/xml/node_set.rb:187:in `block in each' /usr/local/rvm/gems/ruby-2.3.0/gems/nokogiri-1.6.8.1/lib/nokogiri/xml/node_set.rb:186:in `upto' /usr/local/rvm/gems/ruby-2.3.0/gems/nokogiri-1.6.8.1/lib/nokogiri/xml/node_set.rb:186:in `each' /home/rails/myproject/app/services/all_events_guide_my_object_finder_service.rb:82:in `process_my_object_link' /home/rails/myproject/app/services/abstract_my_object_finder_service.rb:29:in `block in process_data' /home/rails/myproject/app/services/abstract_my_object_finder_service.rb:28:in `each' /home/rails/myproject/app/services/abstract_my_object_finder_service.rb:28:in `process_data' /home/rails/myproject/app/services/run_crawlers_service.rb:18:in `block in run_all_crawlers' /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/relation/delegation.rb:46:in `each' /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/relation/delegation.rb:46:in `each' /home/rails/myproject/app/services/run_crawlers_service.rb:5:in `run_all_crawlers' /home/rails/myproject/app/controllers/my_objects_controller.rb:170:in `block in import' 

How can I clear the cache and let my cached method get started properly?

Edit: I get the same error above with Deepak's suggestion, but here is the result of his answer ...

 rails@mymachine :~/myproject$ rails console Loading development environment (Rails 4.2.7.1) 2.3.0 :001 > Rails.cache.clear => ["/home/rails/myproject/tmp/cache/assets"] 2.3.0 :002 > quit 

Edit 2: Here is my config / environment.production.rb file. This is a production environment ...

 Rails.application.configure do # Settings specified here will take precedence over those in config/application.rb. # Code is not reloaded between requests. config.cache_classes = true # Eager load code on boot. This eager loads most of Rails and # your application in memory, allowing both threaded web servers # and those relying on copy on write to perform better. # Rake tasks automatically ignore this option for performance. config.eager_load = true # Full error reports are disabled and caching is turned on. config.consider_all_requests_local = false config.action_controller.perform_caching = true # Enable Rack::Cache to put a simple HTTP cache in front of your application # Add `rack-cache` to your Gemfile before enabling this. # For large-scale production use, consider using a caching reverse proxy like # NGINX, varnish or squid. # config.action_dispatch.rack_cache = true # Disable serving static files from the `/public` folder by default since # Apache or NGINX already handles this. config.serve_static_files = ENV['RAILS_SERVE_STATIC_FILES'].present? # Compress JavaScripts and CSS. config.assets.js_compressor = :uglifier # config.assets.css_compressor = :sass # Do not fallback to assets pipeline if a precompiled asset is missed. config.assets.compile = false # Asset digests allow you to set far-future HTTP expiration dates on all assets, # yet still be able to expire them through the digest params. config.assets.digest = true # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb # Specifies the header that your server uses for sending files. # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies. # config.force_ssl = true # Use the lowest log level to ensure availability of diagnostic information # when problems arise. config.log_level = :debug # Prepend all log lines with the following tags. # config.log_tags = [ :subdomain, :uuid ] # Use a different logger for distributed setups. # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new) # Use a different cache store in production. # config.cache_store = :mem_cache_store # Enable serving of images, stylesheets, and JavaScripts from an asset server. # config.action_controller.asset_host = 'http://assets.example.com' # Enable locale fallbacks for I18n (makes lookups for any locale fall back to # the I18n.default_locale when a translation cannot be found). config.i18n.fallbacks = true # Send deprecation notices to registered listeners. config.active_support.deprecation = :notify # Use default logging formatter so that PID and timestamp are not suppressed. config.log_formatter = ::Logger::Formatter.new # Do not dump schema after migrations. config.active_record.dump_schema_after_migration = false config.serve_static_assets = true config.assets.compile = true end 

Answer 1

Instead of rake tmp:cache:clear run the following command in the console

 Rails.cache.clear 

This will clear the cache from any cache store that you use.

 config.cache_store = :file_store # or config.cache_store = :mem_cache_store 

Answer 2

It looks like your application somehow requires the existence of the tmp/cache/001/000/ path. And, as you can see in: https://github.com/rails/rails/blob/4-2-stable/railties/lib/rails/tasks/tmp.rake#L25-L30 , the task is rake tmp:cache:clear removed all contents from tmp/cache including 001/000 . I think a quick solution would be to manually create this path mkdir -p tmp/cache/001/000/ inside the project root after clearing the cache.

You can add a custom task to your application to automate it with rails g task cache and write something like:

 namespace :cache do task :clear do FileUtils.rm_rf(Dir['tmp/cache/[^.]*']) `mkdir -p tmp/cache/001/000/` end end 

Then you can call your custom rake cache:clear and make sure that the required path exists.