#!/usr/bin/env ruby

require 'bundler/inline'  

gemfile do
  source 'https://rubygems.org'
  gem 'mongoid', '9.0.0'
end

require 'mongoid'

Mongoid.configure { |c| c.clients.default = { hosts: ['localhost'], database: 'test' } }
puts Mongoid::VERSION
puts Mongo::VERSION

# From https://github.com/mongodb/mongoid/blob/master/spec/mongoid/association/embedded/embeds_many_models.rb
class EmmCongress
  include Mongoid::Document
  include Mongoid::Timestamps

  embeds_many :legislators, class_name: 'EmmLegislator'
end

class EmmLegislator
  include Mongoid::Document

  embedded_in :congress, class_name: 'EmmCongress'

  field :a, type: Integer, default: 0
  field :b, type: Integer, default: 0
end   

# From https://github.com/mongodb/mongoid/blob/master/spec/mongoid/association/embedded/embeds_many_query_spec.rb

# setup
congress = EmmCongress.new
congress.legislators << EmmLegislator.new(a: 1, b: 2)
congress.save!

# let
congress = EmmCongress.only(:id, "legislators.a").first
p congress
# returns #<EmmCongress _id: 669dca95b82c2d0201f76ce3, created_at: nil, updated_at: nil>

legislator = congress.legislators.first
p legislator.congress
# expect to get same value as above but instead got ActiveModel::MissingAttributeError (Missing attribute: 'congress')
# this works in 7.5.4