Hello people,

Please advice with, I have some models and they have feeds, feed is a
small presenter for different types of content.

class Feed
   belongs_to :attachable, :polymorphic => true
end

class Song
 has_one :feed, :as => :attachable
end

class Gallery
 has_one :feed, :as => :attachable
end

So when I call on some_song.feed, and there is no such feed for that
song, I want to create it inside Feed model

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