rails-pr-40879.rb

# frozen_string_literal: true

require "bundler/inline"

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

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

  gem "activerecord", "6.1.0"
  gem "sqlite3"
  gem "awesome_nested_set", require: false
end

require "active_record"
require "awesome_nested_set"

ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :categories do |t|
    t.string :name
    t.integer :parent_id, null: true, index: true
    t.integer :lft, null: false, index: true
    t.integer :rgt, null: false, index: true
  end
end

class Category < ActiveRecord::Base
  acts_as_nested_set
end