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simple_cacheable

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a simple cache implementation for rails

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Simple Cacheable [![Build Status](https://travis-ci.org/flyerhzm/simple_cacheable.png?branch=master)](https://travis-ci.org/flyerhzm/simple_cacheable)
=========

Simple Cacheable is a simple cache implementation based on activerecord, it is
extracted from [rails-bestpractices.com][1].

it supports activerecord >= 3.0.0, tested on 2.0.0 and works with jruby.

Introduction
------------

Here is a blog post to introduce simple_cacheable gem, <http://rails-bestpractices.com/blog/posts/24-simple_cacheable>

Usage
-----

class User < ActiveRecord::Base
      include Cacheable

has_many :posts
      has_one :account

model_cache do
        with_key                          # User.find_cached(1)
        with_attribute :login             # User.find_cached_by_login('flyerhzm')
        with_method :last_post            # user.cached_last_post
        with_association :posts, :account # user.cached_posts, user.cached_account
      end

def last_post
        posts.last
      end
    end

class Account < ActiveRecord::Base
      belongs_to :user
    end

class Post < ActiveRecord::Base
      include Cacheable

belongs_to :user
      has_many :comments, :as => :commentable

model_cache do
        with_key                                # post.find_cached(1)
        with_class_method  :default_post        # Post.cached_default_post
        with_association   :user, :comments     # post.cached_user, post.cached_comments
      end

def self.default_post
        Post.first
      end
    end

class Comment < ActiveRecord::Base
      include Cacheable

belongs_to :commentable, :polymorphic => true

model_cache do
        with_association :commentable  # comment.cached_commentable
      end
    end

Advanced Usage
--------------

Utilize Simple Cacheable to cache ActiveRecord objects without marshalling errors:
````ruby
  Cacheable.fetch "collection_of_twelve_users", expires_in: 1.day do
    User.limit(12)
  end
````

Override ````modified_cache_key```` to customize cache keys. Single point for dependency injection.
````ruby
  # E.G. if you wanted to version your cache:
  class User < ActiveRecord::Base
    has_one :cache_version

def self.modified_cache_key(key)
      "#{cache_version.version}/#{key}"
    end
  end
````

(````modified_cache_key```` can be overriden at the class level or the instance level. By default the instance implementation falls back to the class implementation.)

Install
-------

add the following code to your Gemfile

gem "simple_cacheable"

Gotchas
-------

Caching, and caching invalidation specifically, can be hard and confusing.  Simple Cacheable methods should
expire correctly in most cases.  Be careful using `with_method` and `with_class_method`, they should
specifically not be used to return collections.  This is demonstrated well in Tobias Lutke's presentation: [Rockstar Memcaching][2].

[1]:https://github.com/flyerhzm/rails-bestpractices.com
[2]:http://www.infoq.com/presentations/lutke-rockstar-memcaching

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