# frozen_string_literal: true

require 'bundler/inline'

gemfile(true) do
  source 'https://rubygems.org'

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem 'rails', github: 'rails/rails', branch: 'main'
  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:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
    t.integer :comments_count, default: 0
  end

  create_table :users, force: true do |t|
    t.integer :comments_count, default: 0
  end

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

  create_table :comment_maps, force: true do |t|
    t.integer :comment_id
    t.integer :commentable_id
    t.string :commentable_type
  end
end

class User < ActiveRecord::Base
end

class CommentMap < ActiveRecord::Base
  belongs_to :comment
  belongs_to :commentable, polymorphic: true
end

class Comment < ActiveRecord::Base
  belongs_to :user, counter_cache: true
  has_many :comment_maps, dependent: :destroy
  has_many :commented_posts, through: :comment_maps, source: :commentable, source_type: 'Post'
end

class Post < ActiveRecord::Base
  has_many :comment_maps, as: :commentable
  has_many :comments, through: :comment_maps
end

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

    assert_equal 0, post.comments_count
  end
end

Failure:
BugTest#test_counter [test.rb:66]:
Expected: 0
  Actual: 1