module PermaCache

# File lib/perma_cache.rb, line 28
def self.build_key_from_object(obj)
  # Don't want to add this to Object
  Array.new.tap do |arr|

    if obj.respond_to?(:cache_key)
      arr << obj.cache_key
    else
      arr << (obj.is_a?(Module) ? obj.name : obj.class.name)
      if obj.respond_to?(:id)
        arr << obj.id
      end
    end
  end
end

# File lib/perma_cache.rb, line 20
def self.cache
  if defined?(@cache) && @cache.is_a?(Symbol)
    @cache = @cache.to_s.classify.constantize
  else
    @cache ||= raise(UndefinedCache, "Please define a cache object: (PermaCache.cache = Rails.cache)")
  end
end

# File lib/perma_cache.rb, line 16
def self.cache=(c)
  @cache = c
end

# File lib/perma_cache.rb, line 43
def self.included(base)
  base.extend ClassMethods
end

# File lib/perma_cache.rb, line 12
def self.version
  @version ||= 1
end

# File lib/perma_cache.rb, line 8
def self.version=(v)
  @version = v
end