3265_spec.rb

require "spec_helper"

class Publication
  include Mongoid::Document
  embeds_many :issues

end

class Issue
  include Mongoid::Document
  embedded_in :publication
  embeds_many :articles, :as => :articleable, :class_name => 'Article'

  accepts_nested_attributes_for :articles, :allow_destroy => true, :autosave => true
end

class Article
  include Mongoid::Document
  embedded_in :articleable, polymorphic: true
  field :title
end

describe "3265" do

  before do
    p = Publication.create!
    i = Issue.new(articles: [Article.new(title: 'Some value')] )
    p.issues << i
  end

  let(:issue) do
    Publication.last.issues.first
  end

  it "works" do
    count = 0
    issue.articles.each do |article|
      count += 1
      expect(article.title).to eq("Some value")
    end

    expect(count).to eq(1)
  end
end