See ActiveSupport::Cache::Store for documentation.

Namespace
Methods
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Class Public methods
expand_cache_key(key, namespace = nil)
# File activesupport/lib/active_support/cache.rb, line 57
def self.expand_cache_key(key, namespace = nil)
  expanded_cache_key = namespace ? "#{namespace}/" : ""
  if ENV["RAILS_CACHE_ID"] || ENV["RAILS_APP_VERSION"]
    expanded_cache_key << "#{ENV["RAILS_CACHE_ID"] || ENV["RAILS_APP_VERSION"]}/"
  end
  expanded_cache_key << case
    when key.respond_to?(:cache_key)
      key.cache_key
    when key.is_a?(Array)
      key.collect { |element| expand_cache_key(element) }.to_param
    when key
      key.to_param
    end.to_s
  expanded_cache_key
end
lookup_store(*store_option)

Creates a new CacheStore object according to the given options.

If no arguments are passed to this method, then a new ActiveSupport::Cache::MemoryStore object will be returned.

If you pass a Symbol as the first argument, then a corresponding cache store class under the ActiveSupport::Cache namespace will be created. For example:

ActiveSupport::Cache.lookup_store(:memory_store)
# => returns a new ActiveSupport::Cache::MemoryStore object
ActiveSupport::Cache.lookup_store(:drb_store)
# => returns a new ActiveSupport::Cache::DRbStore object

Any additional arguments will be passed to the corresponding cache store class's constructor:

ActiveSupport::Cache.lookup_store(:file_store, "/tmp/cache")
# => same as: ActiveSupport::Cache::FileStore.new("/tmp/cache")

If the first argument is not a Symbol, then it will simply be returned:

ActiveSupport::Cache.lookup_store(MyOwnCacheStore.new)
# => returns MyOwnCacheStore.new
# File activesupport/lib/active_support/cache.rb, line 42
def self.lookup_store(*store_option)
  store, *parameters = *([ store_option ].flatten)
  case store
  when Symbol
    store_class_name = (store == :drb_store ? "DRbStore" : store.to_s.camelize)
    store_class = ActiveSupport::Cache.const_get(store_class_name)
    store_class.new(*parameters)
  when nil
    ActiveSupport::Cache::MemoryStore.new
  else
    store
  end
end