From 36d41a15c35e6f4b698931987b2115e221d0fcfa Mon Sep 17 00:00:00 2001 From: Daniel Schierbeck Date: Mon, 15 Apr 2013 16:41:27 +0200 Subject: Allow fetching multiple values from the cache at once Add a simple API for fetching a list of entries from the cache, where any missing entries are computed by a supplied block. --- activesupport/lib/active_support/cache.rb | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'activesupport/lib/active_support') diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb index 6c220ae625..b1ab5570a8 100644 --- a/activesupport/lib/active_support/cache.rb +++ b/activesupport/lib/active_support/cache.rb @@ -352,6 +352,34 @@ module ActiveSupport results end + # Fetches data from the cache, using the given keys. If there is data in + # the cache with the given keys, then that data is returned. Otherwise, + # the supplied block is called for each key for which there was no data, + # and the result will be written to the cache and returned. + # + # Options are passed to the underlying cache implementation. + # + # Returns an array with the data for each of the names. For example: + # + # cache.write("bim", "bam") + # cache.fetch_multi("bim", "boom") {|key| key * 2 } + # #=> ["bam", "boomboom"] + # + def fetch_multi(*names) + options = names.extract_options! + options = merged_options(options) + + results = read_multi(*names, options) + + names.map do |name| + results.fetch(name) do + value = yield name + write(name, value, options) + value + end + end + end + # Writes the value to the cache, with the key. # # Options are passed to the underlying cache implementation. -- cgit v1.2.3