paper-trail-gem/paper_trail#428

paper_trail_template_for_issue_428.rb

# Activate the gem you are reporting the issue against.
gem 'activerecord', '4.0.10'
gem 'sqlite3', '1.3.9'
gem 'paper_trail', '3.0.6'
gem 'friendly_id', '5.0.4'

require 'active_record'
require 'minitest/autorun'
require 'logger'

require 'paper_trail'
require 'friendly_id'

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

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

ActiveRecord::Schema.define do
  create_table :posts do |t|
    t.string :name
    t.text :body
    t.string :slug, :unique => true
    t.timestamps
  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
    t.datetime :created_at
  end
  add_index :versions, [:item_type, :item_id]

  create_table :friendly_id_slugs do |t|
    t.string   :slug,           :null => false
    t.integer  :sluggable_id,   :null => false
    t.string   :sluggable_type, :limit => 50
    t.string   :scope
    t.datetime :created_at
  end
  add_index :friendly_id_slugs, :sluggable_id
  add_index :friendly_id_slugs, [:slug, :sluggable_type]
  add_index :friendly_id_slugs, [:slug, :sluggable_type, :scope], :unique => true
  add_index :friendly_id_slugs, :sluggable_type
end

class Post < ActiveRecord::Base
  extend FriendlyId
  friendly_id :name, use: :slugged

  has_paper_trail only: [:slug, :name]
end

class BugTest < Minitest::Test
  def test_versioning
    post = Post.create!(name: 'post name')
    post.update_attribute(:name, 'name changed')
    assert_equal 2, post.versions.count
    post.update_attribute(:body, 'here is some body text')
    assert_equal 2, post.versions.count
  end
end