hbmt_spec.rb

require 'mongoid'

ENV["RACK_ENV"] = 'test'

Mongoid.load!("./config/mongoid.yml")

class Tag
  include Mongoid:: Document
end

class Post
  include Mongoid:: Document

  has_and_belongs_to_many :tags, inverse_of: nil
end

describe "HBTM" do
  it "returns tags" do
    tag  = Tag.create
    post = Post.create

    post.tag_ids = [tag.id]
    post.save

    post.reload

    post.tags.should == [tag]
  end

  it "return tags" do
    tag  = Tag.create
    post = Post.create

    post.tags << tag

    post.reload

    post.tags.should == [tag]
  end

  it "return tags" do
    post = Post.create

    tag = post.tags.create

    post.reload

    post.tags.should == [tag]
  end
end