We have this code:
class Band
include Mongoid::Document
has_many :albums
end
class Album
include Mongoid::Document
belongs_to :band
end
@bands = Band.includes(:albums).entries
This is great, because now I can run @bands.first.albumswithout getting into the database. But now, if we write, this includes cache rails ...
Rails.cache.write('bands', @bands)
... then we read the cache.
bands = Rails.cache.read('bands')
This returns an array of tape documents ...
[#<Band _id: 536a53c969702d208f240000, created_at: 2014-05-07 15:39:53 UTC, updated_at: 2014-05-08 15:55:29 UTC, name: "Pink Floyd", fan_count: 394857, #<Band _id: 536adf2a69702d1574130000, created_at: 2014-05-08 01:34:34 UTC, updated_at: 2014-05-08 01:35:40 UTC, name: "Tool", fan_count: 2958394, #<Band _id: 536bcad169702d743e1e0000, created_at: 2014-05-08 18:20:01 UTC, updated_at: 2014-05-08 18:27:10 UTC, name: "My Morning Jacket", fan_count: 3945734]
... and then we cannot get the albums.
bands.first.albums
NoMethodError: undefined method 'albums' for
Is there a way to cache these downloaded documents using Rails or Mongoid?
FYI we use Mongoid 4.