active_record_test.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
  source "https://rubygems.org"
  # Activate the gem you are reporting the issue against.
  gem "activerecord", "5.0.0"
  gem "sqlite3"
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 :posts, force: true do |t|
  end

  create_table :assets, force: true do |t|
    t.integer :kind
    t.integer :assetable_id
    t.string :assetable_type
    t.string :data
  end
end

class Post < ActiveRecord::Base
  has_many :assets, -> { where(:kind => 1) }, :as => :assetable
end

class Asset < ActiveRecord::Base
  belongs_to :assetable, :polymorphic => true

  def data=(value)
    super "Saving value \"#{value}\" " <<
          "of kind \"#{self.kind}\" " <<
          "for assetable id \"#{self.assetable_id}\" " <<
          "and assetable type \"#{self.assetable_type}\""
  end
end

class AssociationTest < Minitest::Test
  def test_association_stuff
    post = Post.create!
    value = "Test Data"

    post.assets.create(:data => value)

    expected_data = "Saving value \"#{value}\" " <<
                    "of kind \"1\" " <<
                    "for assetable id \"#{post.id}\" " <<
                    "and assetable type \"#{post.class.name}\""

    assert_equal expected_data, post.assets.first.data
  end
end