paper_trail-association_tracking_empty_type_example.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 "rails"
  # If you want to test against edge Rails replace the previous line with this:
  # gem "rails", github: "rails/rails", branch: "main"
  gem "paper_trail"
  gem "paper_trail-association_tracking"
  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|
  end

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

  create_table :versions do |t|
    t.string   :item_type, null: false
    t.integer  :item_id,   null: false
    t.string   :event,     null: false
    t.string   :whodunnit
    t.text     :object
    t.text     :object_changes
    t.integer  :transaction_id
    t.datetime :created_at, limit: 6

    # Metadata columns.
    t.integer :answer
    t.string :action
    t.string  :question
    t.integer :article_id
    t.string :title

    # Controller info columns.
    t.string :ip
    t.string :user_agent
  end
  add_index :versions, %i[item_type item_id]

  create_table :version_associations do |t|
    t.integer  :version_id
    t.string   :foreign_key_name, null: false
    t.integer  :foreign_key_id
    t.string   :foreign_type
  end
  add_index :version_associations, [:version_id]
  add_index :version_associations,
    %i[foreign_key_name foreign_key_id foreign_type],
    name: "index_version_associations_on_foreign_key"
end

PaperTrail.config.track_associations = true

class Post < ActiveRecord::Base
  has_many :comments
end

class Comment < ActiveRecord::Base
  belongs_to :post, polymorphic: true, optional: true

  has_paper_trail
end

class BugTest < Minitest::Test
  def test_association_stuff
    comment_empty_string = Comment.new(post_type: '')
    assert_raises(NameError){ comment_empty_string.save! }

    comment_with_nil = Comment.new(post_type: nil)
    assert_equal true, comment_with_nil.save! 
  end
end