acts_as_method_cacheable

Instead of writing

class Post < ActiveRecord::Base
  def expensive_method
    @cached_expensive ||= _expensive_method
  end

  def _expensive_method
    sleep 10
    # blablabla
  end
end

now you can write

class Post < ActiveRecord::Base
  def expensive_method
    sleep 10
    # blablabla
  end

  acts_as_method_cacheable :methods => [:expensive_method]
end

or cache method for an instance of Post only

post = Post.find xxx
post.cache_method(:expensive_method)
# post has_many comments
post.cache_method(:comments => :comment_expensive_method)

This gem depends on ActiveSupport/ActiveRecord

Usage

cache method in class level, all instances will have the method cached

NOTE!! MUST put acts_as_method_cacheable in the last of the class file

class Post < ActiveRecord::Base
  def expensive_method
    # balababa
  end
  acts_as_method_cacheable :methods => [:expensive_method]
end

cache methods for an instance only

post = Post.find(xxx)
post.cache_method(:expensive_method)
post.cache_method([:expensive_method1, :expensive_method2])

cache methods for an instance and its associations

post = Post.find(xxx)
post.cache_method([:expensive_method3, :comments => :comment_expensive_method])

reload - will clear cache of all cached methods(both class/instance level)

post = Post.find(xxx)
post.cache_method(:expensive_method)
post.expensive_method  # expensive
post.expensive_method  # cheap!
post.reload
post.expensive_method  # expensive

reset cached method for a instance

post = Post.find(xxx)
post.cache_method(:expensive_method)
post.expensive_method  # expensive
post.expensive_method  # cheap!
post.reset_cache(:expensive_method)
post.expensive_method  # expensive

Installation

Add this line to your application's Gemfile:

gem 'acts_as_method_cacheable'

And then execute:

$ bundle

Or install it yourself as:

$ gem install acts_as_method_cacheable

Current Limitation

ONLY support method with no params

Contribute

You're highly welcome to improve this gem.

Checkout source code to local

say you git clone the source code to /tmp/acts_as_method_cacheable

Install dev bundle

$ cd /tmp/acts_as_method_cacheable
$ bundle install

Do some changes

$ vi lib/acts_as_method_cacheable.rb

Run test

$ bundle exec rspec spec