reify_has_many_through doesn't consider :source option

bug_report_template.rb

# Use this template to report PaperTrail bugs.
# It is based on the ActiveRecord template.
# https://github.com/rails/rails/blob/master/guides/bug_report_templates/active_record_gem.rb
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
  ruby "2.2.3"
  source "https://rubygems.org"
  gem "activerecord", "4.2.6"
  gem "minitest", "5.8.3"
  gem "paper_trail", git: 'https://github.com/airblade/paper_trail.git', require: false
  gem "sqlite3"
  gem "byebug"
end

require "active_record"
require "minitest/autorun"
require "logger"
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :users, force: true do |t|
    t.text :first_name, null: false
    t.timestamps null: false
  end
  
  create_table :friendships, force: true do |t|
    t.integer :user_id, null: false
    t.integer :to_id, null: false
    t.timestamps null: false
  end
  create_table :versions do |t|
    t.string :item_type, null: false
    t.integer :item_id, null: false
    t.string :event, null: false
    t.string :whodunnit
    t.text :object, limit: 1_073_741_823
    t.text :object_changes, limit: 1_073_741_823
    t.integer :transaction_id
    t.datetime :created_at
  end
  add_index :versions, [:item_type, :item_id]
  add_index :versions, [:transaction_id]

  create_table :version_associations do |t|
    t.integer  :version_id
    t.string   :foreign_key_name, null: false
    t.integer  :foreign_key_id
  end
  add_index :version_associations, [:version_id]
  add_index :version_associations, [:foreign_key_name, :foreign_key_id],
    name: "index_version_associations_on_foreign_key"
end

# Require `paper_trail.rb` after the `version_associations` table
# exists so that PT will track associations.
require "paper_trail"

# Example: we have a self-referencing has_many :through association: 
#          A User can have many other Users as friends.
#          The problem here is the ':source' option.
class User < ActiveRecord::Base
  has_paper_trail
  has_many :friendships
  has_many :friends, through: :friendships, source: :to
end

class Friendship < ActiveRecord::Base
  has_paper_trail
  belongs_to :user
  belongs_to :to, class_name: 'User'
end

# Please write a test that demonstrates your issue by failing.
class BugTest < ActiveSupport::TestCase
  def test_1
    alice = nil

    User.transaction do
      alice = User.create(first_name: "Alice")
      alice.friends.create(first_name: "Bob")
      alice.touch_with_version
    end

    assert_equal(['Bob'], alice.friends.map { |f| f.first_name })

    User.transaction do
      alice.friends.create(first_name: 'Charlie')
      alice.touch_with_version
    end

    assert_equal(['Bob', 'Charlie'], alice.friends.map { |f| f.first_name })

    last_version = alice.versions.last
    past_alice = last_version.reify(has_many: true)

    assert_equal(['Bob'], past_alice.friends.map { |f| f.first_name }, 'Why is Alice a friend of herself suddenly?')

  end
end