select_regression.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 "rails", github: "rails/rails"
  # gem "activerecord", "5.0.0"
  # gem "activerecord", "4.2.7"
  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|
    t.string :title
  end

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

class Post < ActiveRecord::Base
  has_many :comments
end

class Comment < ActiveRecord::Base
  belongs_to :post
end

class BugTest < Minitest::Test
  def test_association_stuff
    post = Post.create! title: "Rails is so awesome"
    post.comments << Comment.create!(content: "Sure it is")
    post.comments << Comment.create!(content: "One hundred percent!!")

    p post.comments.select { |c| c.content =~ /Sure/ }
    p post.comments.select(:content) { |c| c.content =~ /Sure/ }
  end
end

# Failure on Rails master, passes on Rails 4.2.7 and Rails 5.0.0

#   1) Error:
# BugTest#test_association_stuff:
# ArgumentError: wrong number of arguments (given 1, expected 0)
#     /Users/prathamesh/.rbenv/versions/ruby-dev/lib/ruby/gems/2.4.0/bundler/gems/rails-06658f1d9db5/activerecord/lib/active_record/relation/query_methods.rb:245:in `select'
#     /Users/prathamesh/.rbenv/versions/ruby-dev/lib/ruby/gems/2.4.0/bundler/gems/rails-06658f1d9db5/activerecord/lib/active_record/relation/query_methods.rb:245:in `select'
#     select_regression.rb:54:in `test_association_stuff'

# 1 runs, 0 assertions, 0 failures, 1 errors, 0 skips