MongoDB Has many through

mongo_has_many_through.rb

class Book
   field :id
   field :title
 
   embeds_many :book_authors

   # Mongoid does not offer has_many :through
   def authors
      book_authors.collect(&:author)
   end
end

class BookAuthor
   field :name
   belongs_to :author
end

class Author
   field :id
   field :name
   field :location
end