mountable_engine_debug_try.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", "5.1.2"
  gem "activerecord", "5.1.2"
  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 :posting_posts, force: true do |t|
  end

  create_table :posting_comments, force: true do |t|
    t.references :posts
  end
end

module Posting
  class Engine < ::Rails::Engine
    isolate_namespace Posting
  end
end

module Posting
  class Post < ActiveRecord::Base
    has_many :comments
  end

  class Comment < ActiveRecord::Base
    belongs_to :post
  end
end

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

    assert_equal 1, post.comments.count
    assert_equal 1, Posting::Comment.count
    assert_equal post.id, Posting::Comment.first.post.id
  end
end

/Users/willnet/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.2/lib/rails/engine.rb:670:in `find_root_with_flag': Could not find root path for Posting::Engine (RuntimeError)
	from /Users/willnet/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.2/lib/rails/engine.rb:371:in `find_root'
	from /Users/willnet/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.2/lib/rails/engine.rb:540:in `config'
	from /Users/willnet/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.2/lib/rails/engine.rb:533:in `routes'
	from /Users/willnet/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.2/lib/rails/railtie.rb:185:in `public_send'
	from /Users/willnet/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.2/lib/rails/railtie.rb:185:in `method_missing'
	from /Users/willnet/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.2/lib/rails/engine.rb:383:in `isolate_namespace'
	from mountable_engine_foreign_key.rb:38:in `<class:Engine>'
	from mountable_engine_foreign_key.rb:37:in `<module:Posting>'
	from mountable_engine_foreign_key.rb:36:in `<main>'