class ActiveSupport::Cache::FileStore

def clear(options = nil)

config file when using +FileStore+ because everything in that directory will be deleted.
file store directory except for .keep or .gitkeep. Be careful which directory is specified in your
Deletes all items from the cache. In this case it deletes all the entries in the specified 
def clear(options = nil)
  root_dirs = (Dir.children(cache_path) - GITKEEP_FILES)
  FileUtils.rm_r(root_dirs.collect { |f| File.join(cache_path, f) })
rescue Errno::ENOENT, Errno::ENOTEMPTY
end