Associations Stuff

associations_tests.rb

unless ENV['AR_VERSION']
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
    gem 'sqlite3'
  GEMFILE

  system 'bundle'

  require 'bundler'
  Bundler.setup(:default)
else
  # Activate the gem you are reporting the issue against.
  gem 'activerecord', ENV['AR_VERSION']
end

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

# 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 :accounts do |t|
  end

  create_table :images do |t|
    t.integer :account_id
  end

  create_table :platforms do |t|
    t.integer :account_id
  end

  create_table :target_platforms do |t|
    t.integer :image_id
    t.integer :platform_id
  end
end

class Account < ActiveRecord::Base
end

class Image < ActiveRecord::Base
  belongs_to :account
  has_many :target_platforms
  has_many :platforms, :through => :target_platforms
end

class Platform < ActiveRecord::Base
  belongs_to :account
end

class TargetPlatform < ActiveRecord::Base
  belongs_to :image
  belongs_to :platform

  before_validation :infer_account

  private

  def infer_account
    @account = image.account
  end
end

class BugTest < Minitest::Test
  def test_association_stuff
    account = Account.create
    platform = Platform.create(:account => account)
    image = Image.create(:account => account, :platform_ids => [platform.id])

    assert_equal 1, TargetPlatform.count
  end
end