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Optimising Eager Load

The best way to do this would probably be changing your data model to a polymorphic relationship and using a belongs_to association in MediaItem

class MediaItem < ActiveRecord::Base
  belongs_to :media_content, :polymorphic =>

class Photo < ActiveRecord::Base
  has_many :media_items, :as => :media_content

class Video < ActiveRecord::Base
  has_many :media_items, :as => :media_content

MediaItem.includes(gallery: {media_items:

For this to work you need to have a type media_content_id and media_content_type columns on MediaItem.

EDIT: There is even a note in the docs that eager loading should work in your case in the last paragraph of this section:

Categories : Ruby On Rails

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