Rails 15258 issue gist

15258.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
    gem 'sqlite3'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)
require 'active_record'
require 'sqlite3'

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 do |t|
    t.string :name
  end

  create_table :comments do |t|
    t.string :content
    t.belongs_to :post
  end
end

class Post < ActiveRecord::Base
  has_many :comments, inverse_of: :post
  validate :given_validation

  after_save :update_comments

  def given_validation
    comments.select(:post_id) # This is the line that makes the test fail.
  end

  def update_comments
    comments.update_all(content: "foo")
  end
end

class Comment < ActiveRecord::Base
  belongs_to :post, inverse_of: :comments
end

class BugTest < Minitest::Test
  def test_update_all_after_selection
    post = Post.create!
    comment = Comment.create!
    post.comments << comment

    post.update(name: "bar")

    assert_equal 'foo', comment.reload.content
  end
end