bug_report.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", github: "rails/rails"
  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 :reports, force: true do |t|
    t.string :name
    t.references :owner, polymorphic: true, null: false
  end

  create_table :users, force: true do |t|
    t.string :name
  end
end

class Report < ActiveRecord::Base
  belongs_to :owner, polymorphic: true
end

class User < ActiveRecord::Base
  has_many :reports, as: :owner
end

class BugTest < Minitest::Test
  def test_polymorphic_association_scope
    user = User.create! name: 'Josh'
    Report.create!(name: 'test report', owner: user)

    assert_equal user.id, Report.first.owner_id
    assert_equal 'User', Report.first.owner_type
    assert_equal 'SELECT "reports".* FROM "reports" WHERE "reports"."owner_type" = \'User\' AND "reports"."owner_id" = 1', user.reports.to_sql
  end

  def test_polymorphic_joins
    assert_equal 'SELECT "users".* FROM "users" INNER JOIN "reports" ON "reports"."owner_type" = \'User\' AND "reports"."owner_id" = "users"."id"', User.joins(:reports).to_sql
  end
end