begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'
  gem 'rails', '5.1.7'  # use correct rails version
  gem 'cancancan', '3.0.1' # use correct cancancan version
  gem 'sqlite3', '1.3.9' # use another DB if necessary
end

require 'active_record'
require 'cancancan'
require 'cancan/model_adapters/active_record_adapter'
require 'cancan/model_adapters/active_record_4_adapter'
require 'cancan/model_adapters/active_record_5_adapter'
require 'cancan/model_adapters/conditions_normalizer'
require 'minitest/autorun'
require 'logger'

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

# create your tables here
ActiveRecord::Schema.define do
  create_table :foos, force: true  do |t|
  end

  create_table :connections, force: true  do |t|
    t.references :foo
    t.references :holder, polymorphic: true
  end

  create_table :bars, force: true  do |t|
  end
end

class A < ActiveRecord::Base
end

class B < ActiveRecord::Base
end

class Connection < ActiveRecord::Base
  has_one :self_ref, class_name: 'Connection', foreign_key: :id
  has_one :a, through: :self_ref, source: :owner, source_type: A
  has_one :b, through: :self_ref, source: :owner, source_type: B

  belongs_to :owner, polymorphic: true
  belongs_to :bar
end

class Bar < ActiveRecord::Base
  has_many :connections, as: :owner
end

class Ability
  include CanCan::Ability

  def initialize(user)
    can :read, Bar, connections: { a: { id: 1 } }
  end
end

class BugTest < Minitest::Test
  def test_bug
    ability = Ability.new(nil)
    Bar.accessible_by(ability)
  end
end