sample rails app for bug

app.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails', tag: 'v3.2.22'
    gem 'pg', '~> 0.18.1'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

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

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

ActiveRecord::Schema.define do
  create_table :surveys, force: true do |t|
  end

  create_table :email_templates, force: true do |t|
    t.string :survey_id
  end
end

class Survey < ActiveRecord::Base
  has_many :email_templates
end

class EmailTemplate < ActiveRecord::Base
  belongs_to :survey
end

class BugTest < ActiveRecord::TestCase
  def test_association_stuff
    survey = Survey.create!
    email_template = EmailTemplate.create!(survey_id: survey.id)
    assert_equal survey.email_templates.to_a, [email_template]
  end
end

updated_app.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails', tag: 'v3.2.22'
    gem 'pg', '~> 0.18.1'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

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

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

ActiveRecord::Schema.define do
  create_table :surveys, force: true

  create_table :tfs, id: false, force: true do |t|
    t.string :id
  end

  create_table :email_templates, force: true do |t|
    t.string :object_with_email_template_id
    t.string :object_with_email_template_type
  end
end

class Survey < ActiveRecord::Base
  has_many :email_templates, as: :object_with_email_template
end

class Tfs < ActiveRecord::Base
  has_many :email_templates, as: :object_with_email_template
end

class EmailTemplate < ActiveRecord::Base
  belongs_to :object_with_email_template, polymorphic: true
end

class BugTest < ActiveRecord::TestCase
  def test_association_stuff
    survey = Survey.create!
    tfs = Tfs.create!(id: 'my_tfs')

    survey_email_template = EmailTemplate.create!(object_with_email_template: survey)
    assert_equal survey.email_templates.to_a, [survey_email_template]

    tfs_email_template = EmailTemplate.create!(object_with_email_template: tfs)
    assert_equal tfs.email_templates.to_a, [tfs_email_template]
  end
end