activerecord bug test

test_case.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", "5.0.1"
  gem "sqlite3"
  gem "mysql2"
  gem "postgresql"
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.
case ENV["ARCONN"]
when "mysql2"
  ActiveRecord::Base.establish_connection(adapter: "mysql2", database: "activerecord_unittest")
when "postgresql"
  ActiveRecord::Base.establish_connection(adapter: "postgresql", database: "activerecord_unittest")
else
  ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
end
ActiveRecord::Base.logger = Logger.new(STDOUT)

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

  create_table :comments, force: true do |t|
    t.integer :post_id
  end
end

class Post < ActiveRecord::Base
  after_create -> { comments.minimum(:id) }
  after_touch -> { comments.minimum(:id) }

  has_many :comments
end

class Comment < ActiveRecord::Base
  belongs_to :post
end

class BugTest < Minitest::Test
  def setup
    @post = Post.create
    3.times do |i|
      @post.comments.create
    end

    @post.reload
  end

  def test_association_stuff
    other_post = Post.create(comments: @post.comments)
    other_post.touch
  end
end

Replace gem "postgresql" with gem "pg"