claudiob · February 26, 2016 17:08 · Feb 26, 2016
diff --git a/test_polymorphic_validates_associated.rb b/test_polymorphic_validates_associated.rb
@@ -0,0 +1,64 @@
+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'
+  gem 'rails', '5.0.0.beta3' # CHANGE TO '5.0.0.beta2' for tests to pass
+  gem 'sqlite3'
+  gem 'pry-nav'
+end
+
+require 'active_record'
+require 'minitest/autorun'
+require 'logger'
+
+# 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, force: true do |t|
+  end
+
+  create_table :authorizations, force: true do |t|
+    t.integer  :authority_id, null: false
+    t.string   :authority_type, null: false
+  end
+end
+
+class Account < ActiveRecord::Base
+end
+
+class Authorization < ActiveRecord::Base
+  validates :authority_id, :authority_type, presence: true
+  belongs_to :authority, polymorphic: true
+end
+
+class Partnership < Authorization
+  validates_associated :authority
+end
+
+class BugTest < Minitest::Test
+  def test_polymorphic_validates_associated
+    ActiveRecord::Base.belongs_to_required_by_default = true
+
+    account = Account.create!
+    account = Account.create!
+    authority = Authorization.create! authority: account
+    partnership = Partnership.new authority: authority
+
+    Authorization.belongs_to :partner, foreign_key: 'authority_id', class_name: 'Authorization'
+
+    assert partnership.valid?, partnership.errors.full_messages.to_sentence
+    # on Rails 5.0.0.beta2:
+    # => No errors
+
+    # on Rails 5.0.0.beta3 (and master@364e155):
+    # => Failure: Authority is invalid
+
+  end
+end