t.references polymorphic: true, index: true changes from 4.0, 4.1, 4.2, 5.0.0.beta4

a_recreation_script.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'
  # gem 'rails', '~>4.2.0'
  gem 'rails', github: 'rails/rails'

  gem 'sqlite3'
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:')
logger = Logger.new(STDOUT)
logger.level = 1
ActiveRecord::Base.logger = logger

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

  create_table :comments, force: true  do |t|
    t.references :resource, polymorphic: true, index: true
  end
end

class Post < ActiveRecord::Base
  has_many :comments
end

class Comment < ActiveRecord::Base
  belongs_to :post
end

puts "Rails version: " + Rails.version
ActiveRecord::SchemaDumper.dump

output_4_0_13.rb

# Rails version: 4.0.13

ActiveRecord::Schema.define(version: 0) do

  create_table "comments", force: true do |t|
    t.integer "resource_id"
    t.string  "resource_type"
  end

  add_index "comments", ["resource_id", "resource_type"], name: "index_comments_on_resource_id_and_resource_type"

  create_table "posts", force: true do |t|
  end

end

output_4_1_15.rb

# Rails version: 4.1.15

ActiveRecord::Schema.define(version: 0) do

  create_table "comments", force: true do |t|
    t.integer "resource_id"
    t.string  "resource_type"
  end

  add_index "comments", ["resource_id", "resource_type"], name: "index_comments_on_resource_id_and_resource_type"

  create_table "posts", force: true do |t|
  end

end

output_4_2_6.rb

# Rails version: 4.2.6

ActiveRecord::Schema.define(version: 0) do

  create_table "comments", force: :cascade do |t|
    t.integer "resource_id"
    t.string  "resource_type"
  end

  add_index "comments", ["resource_type", "resource_id"], name: "index_comments_on_resource_type_and_resource_id"

  create_table "posts", force: :cascade do |t|
  end

end

output_5_0_0beta4.rb

# Rails version: 5.0.0.beta4

ActiveRecord::Schema.define(version: 0) do

  create_table "comments", force: :cascade do |t|
    t.string  "resource_type"
    t.integer "resource_id"
    t.index ["resource_type", "resource_id"], name: "index_comments_on_resource_type_and_resource_id"
  end

  create_table "posts", force: :cascade do |t|
  end

end

output_5_0_0beta4_patched.rb

# Rails version: 5.0.0.beta4

ActiveRecord::Schema.define(version: 0) do

  create_table "comments", force: :cascade do |t|
    t.integer "resource_id"
    t.string  "resource_type"
    t.index ["resource_id", "resource_type"], name: "index_comments_on_resource_id_and_resource_type"
  end

  create_table "posts", force: :cascade do |t|
  end

end

patch.diff

From e3b0a3615aa9341ce92be681e1d860deb1259b3e Mon Sep 17 00:00:00 2001
From: Joe Rafaniello <[email protected]>
Date: Fri, 6 May 2016 11:20:01 -0400
Subject: [PATCH] PAUSED: Use `git resume` to continue working.

---
 .../active_record/connection_adapters/abstract/schema_definitions.rb    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
index bbb0e92..a7d0987 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
@@ -129,7 +129,7 @@ def foreign_key_options
       def columns
         result = [[column_name, type, options]]
         if polymorphic
-          result.unshift(["#{name}_type", :string, polymorphic_options])
+          result << ["#{name}_type", :string, polymorphic_options]
         end
         result
       end