Super fast and easy versioning for models and associations. Do cache lookups using this fast version number instead of managing complex cache expiry.
Versionable is intended for versioning of a model or an association and doesn’t currently provide any means of caching version numbers for normal model instances.
# A simple User model with a User.cached_all method that returns all users
# in the application. This method is cached and will automatically "expire"
# whenever a record is saved or you call User.new_version.
class User < ActiveRecord::Base
versionable :cache => Rails.cache
after_save { new_version }
def self.cached_all
# reference version in cache keys
Rails.cache.fetch("User.cached_all:#{version}") { all }
end
end
>> User.cached_all # initial cache miss and cache fill
>> User.cached_all # cache hit
>> User.new_version # => 1224985243
>> User.cached_all # new cache miss and cache fill
>> User.first.save # causing new_version to be called from after_save
>> User.cached_all # new cache miss and cache fill
You can also use it on associations…
As a Rails plugin.
./script/plugin install git://github.com/jqr/versionable.git
Prefer gems? Add this to your environment.rb and run the following command.
config.gem 'jqr-versionable', :lib => 'versionable', :source => 'http://gems.github.com' $ rake gems:install
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Copyright © 2008 Elijah Miller <elijah.miller@gmail.com>, released under the MIT license.