named_scope_test.rb

require "cases/helper"
require 'models/post'
require 'models/topic'
require 'models/comment'
require 'models/reply'
require 'models/author'

class NamedScopeTest < ActiveRecord::TestCase
  fixtures :posts, :authors, :topics, :comments

  def test_implements_enumerable
    assert !Topic.find(:all).empty?

    assert_equal Topic.find(:all),   Topic.base
    assert_equal Topic.find(:all),   Topic.base.to_a
    assert_equal Topic.find(:first), Topic.base.first
    assert_equal Topic.find(:all),   Topic.base.each { |i| i }
  end

  def test_found_items_are_cached
    Topic.columns
    all_posts = Topic.base

    assert_queries(1) do
      all_posts.collect
      all_posts.collect
    end
  end

  def test_reload_expires_cache_of_found_items
    all_posts = Topic.base
    all_posts.inspect

    new_post = Topic.create!
    assert !all_posts.include?(new_post)
    assert all_posts.reload.include?(new_post)
  end

  def test_delegates_finds_and_calculations_to_the_base_class
    assert !Topic.find(:all).empty?

    assert_equal Topic.find(:all),               Topic.base.find(:all)
    assert_equal Topic.find(:first),             Topic.base.find(:first)
    assert_equal Topic.count,                    Topic.base.count
    assert_equal Topic.average(:replies_count), Topic.base.average(:replies_count)
  end

  def test_subclasses_inherit_scopes
    assert Topic.scopes.include?(:base)

    assert Reply.scopes.include?(:base)
    assert_equal Reply.find(:all), Reply.base
  end

  def test_scopes_with_options_limit_finds_to_those_matching_the_criteria_specified
    assert !Topic.find(:all, :conditions => {:approved => true}).empty?

    assert_equal Topic.find(:all, :conditions => {:approved => true}), Topic.approved
    assert_equal Topic.count(:conditions => {:approved => true}), Topic.approved.count
  end

  def test_scopes_with_string_name_can_be_composed
    # NOTE that scopes defined with a string as a name worked on their own
    # but when called on another scope the other scope was completely replaced
    assert_equal Topic.replied.approved, Topic.replied.approved_as_string
  end

  def test_scopes_are_composable
    assert_equal (approved = Topic.find(:all, :conditions => {:approved => true})), Topic.approved
    assert_equal (replied = Topic.find(:all, :conditions => 'replies_count > 0')), Topic.replied
    assert !(approved == replied)
    assert !(approved & replied).empty?

    assert_equal approved & replied, Topic.approved.replied
  end

  def test_procedural_scopes
    topics_written_before_the_third = Topic.find(:all, :conditions => ['written_on < ?', topics(:third).written_on])
    topics_written_before_the_second = Topic.find(:all, :conditions => ['written_on < ?', topics(:second).written_on])
    assert_not_equal topics_written_before_the_second, topics_written_before_the_third

    assert_equal topics_written_before_the_third, Topic.written_before(topics(:third).written_on)
    assert_equal topics_written_before_the_second, Topic.written_before(topics(:second).written_on)
  end

  def test_extensions
    assert_equal 1, Topic.anonymous_extension.one
    assert_equal 2, Topic.named_extension.two
  end

  def test_multiple_extensions
    assert_equal 2, Topic.multiple_extensions.extension_two
    assert_equal 1, Topic.multiple_extensions.extension_one
  end

  def test_has_many_associations_have_access_to_named_scopes
    assert_not_equal Post.containing_the_letter_a, authors(:david).posts
    assert !Post.containing_the_letter_a.empty?

    assert_equal authors(:david).posts & Post.containing_the_letter_a, authors(:david).posts.containing_the_letter_a
  end

  def test_has_many_through_associations_have_access_to_named_scopes
    assert_not_equal Comment.containing_the_letter_e, authors(:david).comments
    assert !Comment.containing_the_letter_e.empty?

    assert_equal authors(:david).comments & Comment.containing_the_letter_e, authors(:david).comments.containing_the_letter_e
  end

  def test_active_records_have_scope_named__all__
    assert !Topic.find(:all).empty?

    assert_equal Topic.find(:all), Topic.base
  end

  def test_active_records_have_scope_named__scoped__
    assert !Topic.find(:all, scope = {:conditions => "content LIKE '%Have%'"}).empty?

    assert_equal Topic.find(:all, scope), Topic.scoped(scope)
  end

  def test_proxy_options
    expected_proxy_options = { :conditions => { :approved => true } }
    assert_equal expected_proxy_options, Topic.approved.proxy_options
  end

  def test_first_and_last_should_support_find_options
    assert_equal Topic.base.first(:order => 'title'), Topic.base.find(:first, :order => 'title')
    assert_equal Topic.base.last(:order => 'title'), Topic.base.find(:last, :order => 'title')
  end

  def test_first_and_last_should_allow_integers_for_limit
    assert_equal Topic.base.first(2), Topic.base.to_a.first(2)
    assert_equal Topic.base.last(2), Topic.base.to_a.last(2)
  end

  def test_first_and_last_should_not_use_query_when_results_are_loaded
    topics = Topic.base
    topics.reload # force load
    assert_no_queries do
      topics.first
      topics.last
    end
  end

  def test_first_and_last_find_options_should_use_query_when_results_are_loaded
    topics = Topic.base
    topics.reload # force load
    assert_queries(2) do
      topics.first(:order => 'title')
      topics.last(:order => 'title')
    end
  end

  def test_empty_should_not_load_results
    topics = Topic.base
    assert_queries(2) do
      topics.empty?  # use count query
      topics.collect # force load
      topics.empty?  # use loaded (no query)
    end
  end
end