방법은 다음과 같습니다
# Expands out the +key+ argument into a key that can be used for the
# cache store. Optionally accepts a namespace, and all keys will be
# scoped within that namespace.
#
# If the +key+ argument provided is an array, or responds to +to_a+, then
# each of elements in the array will be turned into parameters/keys and
# concatenated into a single key. For example:
#
# expand_cache_key([:foo, :bar]) # => "foo/bar"
# expand_cache_key([:foo, :bar], "namespace") # => "namespace/foo/bar"
#
# The +key+ argument can also respond to +cache_key+ or +to_param+.
def expand_cache_key(key, namespace = nil)
expanded_cache_key = namespace ? "#{namespace}/" : ""
if prefix = ENV["RAILS_CACHE_ID"] || ENV["RAILS_APP_VERSION"]
expanded_cache_key << "#{prefix}/"
end
expanded_cache_key << retrieve_cache_key(key)
expanded_cache_key
end
는의 바로 가기를 정의 할 수 :
def cache(*args); ActiveSupport::Cache.expand_cache_key(*args); end
그리고 가독성을 위해 :
ENV["RAILS_CACHE_ID"] = ''
은 그래서 예를 들어, 재귀입니다 :
cache 'string'
=> "/string"
cache [1, 2]
=> "/1/2"
cache [1, 2, 3, 4]
=> "/1/2/3/4"
cache [1, 2], [3, 4]
=> "[3, 4]//1/2"
cache [[1, 2], [3, 4]]
=> "/1/2/3/4"
cache [@users, @products]
=> "https://stackoverflow.com/users/207311-20140409135446308087000/users/207312-20140401185427926822000/products/1-20130531221550045078000/products/2-20131109180059828964000/products/1-20130531221550045078000/products/2-20131109180059828964000"
cache @users.concat(@products)
=> "https://stackoverflow.com/users/207311-20140409135446308087000/users/207312-20140401185427926822000/products/1-20130531221550045078000/products/2-20131109180059828964000/products/1-20130531221550045078000/products/2-20131109180059828964000"
당신이 볼 수 있듯이, 두 번째 매개 변수가 너무 항상 배열에 매개 변수를 넣어, 네임 스페이스입니다.
제 질문에 답장하는 것은 같습니다.