activerecord/test/cases/associations/eager_load_includes_full_sti_class_test.rb


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require "cases/helper"
require "models/post"
require "models/tagging"

module Namespaced
  class Post < ActiveRecord::Base
    self.table_name = "posts"
    has_one :tagging, as: :taggable, class_name: "Tagging"
  end
end

class EagerLoadIncludeFullStiClassNamesTest < ActiveRecord::TestCase
  def setup
    generate_test_objects
  end

  def generate_test_objects
    post = Namespaced::Post.create(title: "Great stuff", body: "This is not", author_id: 1)
    Tagging.create(taggable: post)
  end

  def test_class_names
    old = ActiveRecord::Base.store_full_sti_class

    ActiveRecord::Base.store_full_sti_class = false
    post = Namespaced::Post.includes(:tagging).find_by_title("Great stuff")
    assert_nil post.tagging

    ActiveRecord::Base.store_full_sti_class = true
    post = Namespaced::Post.includes(:tagging).find_by_title("Great stuff")
    assert_instance_of Tagging, post.tagging
  ensure
    ActiveRecord::Base.store_full_sti_class = old
  end
end