In Mongoid, the HABTM relations return docs in the wrong order. This gem will give your document the ability to retrieve it's relations in the same order it was placed in.
For more details about this issue, see #1548
gem install mongoid-sorted-relations
In your Gemfile:
gem 'mongoid-sorted-relations'class Book
include Mongoid::Document
include Mongoid::SortedRelations
has_many :chapters
has_and_belongs_to_many :authors
endMongoid::SortedRelations will add a sorted_ methods to all the has_many and habtm relationships.
book = Book.new title: 'The Art of War'
book.authors << Author.create name: "Sun Tzu"
book.authors << Author.create name: "Sun Wu"
book.authors << Author.create name: "Lao Zi"
book.sorted_authors.map(&:name)
#=> ['Sun Tzu', 'Sun Wu', 'Lao Zi']
book.sorted_authors.limit(2).map(&:name)
#=> ['Sun Tzu', 'Sun Wu']Copyright (c) 2012 De Marque inc. See LICENSE for further details.
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