gistfile1.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
    gem 'rack', github: 'rack/rack'
    gem 'i18n', github: 'svenfuchs/i18n'
    gem 'public_activity', github: 'pokonski/public_activity'
    gem 'sqlite3'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

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

require 'public_activity'

# 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 :trips do |t|
  end

  create_table :travelers do |t|
    t.integer :trip_id
    t.integer :user_id
  end

  create_table :users do |t|
  end

  create_table "activities", force: true do |t|
    t.integer  "trackable_id"
    t.string   "trackable_type"
    t.integer  "owner_id"
    t.string   "owner_type"
    t.string   "key"
    t.text     "parameters"
    t.integer  "recipient_id"
    t.string   "recipient_type"
    t.datetime "created_at"
    t.datetime "updated_at"
  end
end

class Trip < ActiveRecord::Base
  has_many :travelers
  has_many :users, through: :travelers
end

class Traveler < ActiveRecord::Base
  include PublicActivity::Model
  belongs_to :user
  belongs_to :post

  tracked
end

class User < ActiveRecord::Base
  has_many :travelers
  has_many :trips, through: :travelers
end

class Activity < PublicActivity::Activity
end

class BugTest < Minitest::Test
  def test_association_stuff
    t = Trip.create!
    u1 = User.create!
    u2 = User.create!

    t.users = [u1, u2]

    # 2 activites should be created "traveler.create"
    assert_equal 2, Activity.where(key: 'traveler.create').count

    t.users = [u1]

    # 1 activity should be created "traveler.destroy"
    assert_equal 1, Activity.where(key: 'traveler.destroy').count
  end
end