CODEWITHSUNDEEP
ruby-on-railsrubycachingattr-accessor
rnaud
rnaud

Reputation: 2622

Cache Model array with attr_accessor?

When I add a attr_accessor to my model without the column in the database, I can add temporary data to an array of class objects.

My example : 

class User < ActiveRecord::Base
  attr_accessor :score
end

The problem however is that if cache in memcache an array of users with scores, the array goes from : 

[< User >, < User >, < User >]

to:

[< User >, :@score, 100, < User >, :@score, 200, < User >, :@score, 300]

Is there any way to cache this information without breaking the array ?

EDIT : As requested, the actual code that puts the data in the cache : 

  def users_scoreboard
    Rails.cache.fetch("special_scoreboard_#{self.cache_key}", :expires_in => 1.hour) do
      users = Photo.missions(self.missions).created(self.start_at, self.end_at).map(&:user).uniq!
      users = [] if users.nil?
      users.each do |u|
        u.score = u.score_for_special(self)
      end
      users.sort! { |a,b| b.score <=> a.score }
    end
  end

EDIT : What I'm using : 

ruby -v
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin11.0.1]

rails -v
Rails 3.2.0

memcached -i
memcached 1.4.5

memcached -i
memcached 1.4.5

gem -v dalli
1.8.8

But the problem appears either with Memcache or with the filestore.

Thanks for the help !

Upvotes: 3

Views: 1288

Answers (1)

broomyocymru
broomyocymru

Reputation: 173

Try using cattr_accessor, it'll add the accessor method onto the class as well. This worked for me.

Upvotes: 0

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