rails/activerecord/test/cases/associations_test.rb

require "cases/helper"
require 'models/computer'
require 'models/developer'
require 'models/project'
require 'models/company'
require 'models/categorization'
require 'models/category'
require 'models/post'
require 'models/author'
require 'models/comment'
require 'models/tag'
require 'models/tagging'
require 'models/person'
require 'models/reader'
require 'models/parrot'
require 'models/ship_part'
require 'models/ship'
require 'models/liquid'
require 'models/molecule'
require 'models/electron'
require 'models/man'
require 'models/interest'

class AssociationsTest < ActiveRecord::TestCase
  fixtures :accounts, :companies, :developers, :projects, :developers_projects,
           :computers, :people, :readers

  def test_eager_loading_should_not_change_count_of_children
    liquid = Liquid.create(:name => 'salty')
    molecule = liquid.molecules.create(:name => 'molecule_1')
    molecule.electrons.create(:name => 'electron_1')
    molecule.electrons.create(:name => 'electron_2')

    liquids = Liquid.includes(:molecules => :electrons).references(:molecules).where('molecules.id is not null')
    assert_equal 1, liquids[0].molecules.length
  end

  def test_clear_association_cache_stored
    firm = Firm.find(1)
    assert_kind_of Firm, firm

    firm.clear_association_cache
    assert_equal Firm.find(1).clients.collect{ |x| x.name }.sort, firm.clients.collect{ |x| x.name }.sort
  end

  def test_clear_association_cache_new_record
     firm            = Firm.new
     client_stored   = Client.find(3)
     client_new      = Client.new
     client_new.name = "The Joneses"
     clients         = [ client_stored, client_new ]

     firm.clients    << clients
     assert_equal clients.map(&:name).to_set, firm.clients.map(&:name).to_set

     firm.clear_association_cache
     assert_equal clients.map(&:name).to_set, firm.clients.map(&:name).to_set
  end

  def test_loading_the_association_target_should_keep_child_records_marked_for_destruction
    ship = Ship.create!(:name => "The good ship Dollypop")
    part = ship.parts.create!(:name => "Mast")
    part.mark_for_destruction
    ship.parts.send(:load_target)
    assert ship.parts[0].marked_for_destruction?
  end

  def test_loading_the_association_target_should_load_most_recent_attributes_for_child_records_marked_for_destruction
    ship = Ship.create!(:name => "The good ship Dollypop")
    part = ship.parts.create!(:name => "Mast")
    part.mark_for_destruction
    ShipPart.find(part.id).update_columns(name: 'Deck')
    ship.parts.send(:load_target)
    assert_equal 'Deck', ship.parts[0].name
  end


  def test_include_with_order_works
    assert_nothing_raised {Account.all.merge!(:order => 'id', :includes => :firm).first}
    assert_nothing_raised {Account.all.merge!(:order => :id, :includes => :firm).first}
  end

  def test_bad_collection_keys
    assert_raise(ArgumentError, 'ActiveRecord should have barked on bad collection keys') do
      Class.new(ActiveRecord::Base).has_many(:wheels, :name => 'wheels')
    end
  end

  def test_should_construct_new_finder_sql_after_create
    person = Person.new :first_name => 'clark'
    assert_equal [], person.readers.to_a
    person.save!
    reader = Reader.create! :person => person, :post => Post.new(:title => "foo", :body => "bar")
    assert person.readers.find(reader.id)
  end

  def test_force_reload
    firm = Firm.new("name" => "A New Firm, Inc")
    firm.save
    firm.clients.each {} # forcing to load all clients
    assert firm.clients.empty?, "New firm shouldn't have client objects"
    assert_equal 0, firm.clients.size, "New firm should have 0 clients"

    client = Client.new("name" => "TheClient.com", "firm_id" => firm.id)
    client.save

    assert firm.clients.empty?, "New firm should have cached no client objects"
    assert_equal 0, firm.clients.size, "New firm should have cached 0 clients count"

    assert !firm.clients(true).empty?, "New firm should have reloaded client objects"
    assert_equal 1, firm.clients(true).size, "New firm should have reloaded clients count"
  end

  def test_using_limitable_reflections_helper
    using_limitable_reflections = lambda { |reflections| Tagging.all.send :using_limitable_reflections?, reflections }
    belongs_to_reflections = [Tagging.reflect_on_association(:tag), Tagging.reflect_on_association(:super_tag)]
    has_many_reflections = [Tag.reflect_on_association(:taggings), Developer.reflect_on_association(:projects)]
    mixed_reflections = (belongs_to_reflections + has_many_reflections).uniq
    assert using_limitable_reflections.call(belongs_to_reflections), "Belong to associations are limitable"
    assert !using_limitable_reflections.call(has_many_reflections), "All has many style associations are not limitable"
    assert !using_limitable_reflections.call(mixed_reflections), "No collection associations (has many style) should pass"
  end

  def test_force_reload_is_uncached
    firm = Firm.create!("name" => "A New Firm, Inc")
    Client.create!("name" => "TheClient.com", :firm => firm)
    ActiveRecord::Base.cache do
      firm.clients.each {}
      assert_queries(0) { assert_not_nil firm.clients.each {} }
      assert_queries(1) { assert_not_nil firm.clients(true).each {} }
    end
  end

  def test_association_with_references
    firm = companies(:first_firm)
    assert_equal ['foo'], firm.association_with_references.references_values
  end

end

class AssociationProxyTest < ActiveRecord::TestCase
  fixtures :authors, :posts, :categorizations, :categories, :developers, :projects, :developers_projects

  def test_push_does_not_load_target
    david = authors(:david)

    david.posts << (post = Post.new(:title => "New on Edge", :body => "More cool stuff!"))
    assert !david.posts.loaded?
    assert david.posts.include?(post)
  end

  def test_push_has_many_through_does_not_load_target
    david = authors(:david)

    david.categories << categories(:technology)
    assert !david.categories.loaded?
    assert david.categories.include?(categories(:technology))
  end

  def test_push_followed_by_save_does_not_load_target
    david = authors(:david)

    david.posts << (post = Post.new(:title => "New on Edge", :body => "More cool stuff!"))
    assert !david.posts.loaded?
    david.save
    assert !david.posts.loaded?
    assert david.posts.include?(post)
  end

  def test_push_does_not_lose_additions_to_new_record
    josh = Author.new(:name => "Josh")
    josh.posts << Post.new(:title => "New on Edge", :body => "More cool stuff!")
    assert josh.posts.loaded?
    assert_equal 1, josh.posts.size
  end

  def test_append_behaves_like_push
    josh = Author.new(:name => "Josh")
    josh.posts.append Post.new(:title => "New on Edge", :body => "More cool stuff!")
    assert josh.posts.loaded?
    assert_equal 1, josh.posts.size
  end

  def test_prepend_is_not_defined
    josh = Author.new(:name => "Josh")
    assert_raises(NoMethodError) { josh.posts.prepend Post.new }
  end

  def test_save_on_parent_does_not_load_target
    david = developers(:david)

    assert !david.projects.loaded?
    david.update_columns(created_at: Time.now)
    assert !david.projects.loaded?
  end

  def test_inspect_does_not_reload_a_not_yet_loaded_target
    andreas = Developer.new :name => 'Andreas', :log => 'new developer added'
    assert !andreas.audit_logs.loaded?
    assert_match(/message: "new developer added"/, andreas.audit_logs.inspect)
  end

  def test_save_on_parent_saves_children
    developer = Developer.create :name => "Bryan", :salary => 50_000
    assert_equal 1, developer.reload.audit_logs.size
  end

  def test_create_via_association_with_block
    post = authors(:david).posts.create(:title => "New on Edge") {|p| p.body = "More cool stuff!"}
    assert_equal post.title, "New on Edge"
    assert_equal post.body, "More cool stuff!"
  end

  def test_create_with_bang_via_association_with_block
    post = authors(:david).posts.create!(:title => "New on Edge") {|p| p.body = "More cool stuff!"}
    assert_equal post.title, "New on Edge"
    assert_equal post.body, "More cool stuff!"
  end

  def test_reload_returns_assocition
    david = developers(:david)
    assert_nothing_raised do
      assert_equal david.projects, david.projects.reload.reload
    end
  end

  def test_proxy_association_accessor
    david = developers(:david)
    assert_equal david.association(:projects), david.projects.proxy_association
  end

  def test_scoped_allows_conditions
    assert developers(:david).projects.merge!(where: 'foo').where_values.include?('foo')
  end

  test "getting a scope from an association" do
    david = developers(:david)

    assert david.projects.scope.is_a?(ActiveRecord::Relation)
    assert_equal david.projects, david.projects.scope
  end

  test "proxy object is cached" do
    david = developers(:david)
    assert david.projects.equal?(david.projects)
  end

  test "inverses get set of subsets of the association" do
    man = Man.create
    man.interests.create

    man = Man.find(man.id)

    assert_queries(1) do
      assert_equal man, man.interests.where("1=1").first.man
    end
  end
end

class OverridingAssociationsTest < ActiveRecord::TestCase
  class DifferentPerson < ActiveRecord::Base; end

  class PeopleList < ActiveRecord::Base
    has_and_belongs_to_many :has_and_belongs_to_many, :before_add => :enlist
    has_many :has_many, :before_add => :enlist
    belongs_to :belongs_to
    has_one :has_one
  end

  class DifferentPeopleList < PeopleList
    # Different association with the same name, callbacks should be omitted here.
    has_and_belongs_to_many :has_and_belongs_to_many, :class_name => 'DifferentPerson'
    has_many :has_many, :class_name => 'DifferentPerson'
    belongs_to :belongs_to, :class_name => 'DifferentPerson'
    has_one :has_one, :class_name => 'DifferentPerson'
  end

  def test_habtm_association_redefinition_callbacks_should_differ_and_not_inherited
    # redeclared association on AR descendant should not inherit callbacks from superclass
    callbacks = PeopleList.before_add_for_has_and_belongs_to_many
    assert_equal([:enlist], callbacks)
    callbacks = DifferentPeopleList.before_add_for_has_and_belongs_to_many
    assert_equal([], callbacks)
  end

  def test_has_many_association_redefinition_callbacks_should_differ_and_not_inherited
    # redeclared association on AR descendant should not inherit callbacks from superclass
    callbacks = PeopleList.before_add_for_has_many
    assert_equal([:enlist], callbacks)
    callbacks = DifferentPeopleList.before_add_for_has_many
    assert_equal([], callbacks)
  end

  def test_habtm_association_redefinition_reflections_should_differ_and_not_inherited
    assert_not_equal(
      PeopleList.reflect_on_association(:has_and_belongs_to_many),
      DifferentPeopleList.reflect_on_association(:has_and_belongs_to_many)
    )
  end

  def test_has_many_association_redefinition_reflections_should_differ_and_not_inherited
    assert_not_equal(
      PeopleList.reflect_on_association(:has_many),
      DifferentPeopleList.reflect_on_association(:has_many)
    )
  end

  def test_belongs_to_association_redefinition_reflections_should_differ_and_not_inherited
    assert_not_equal(
      PeopleList.reflect_on_association(:belongs_to),
      DifferentPeopleList.reflect_on_association(:belongs_to)
    )
  end

  def test_has_one_association_redefinition_reflections_should_differ_and_not_inherited
    assert_not_equal(
      PeopleList.reflect_on_association(:has_one),
      DifferentPeopleList.reflect_on_association(:has_one)
    )
  end

  def test_requires_symbol_argument
    assert_raises ArgumentError do
      Class.new(Post) do
        belongs_to "author"
      end
    end
  end
end

class GeneratedMethodsTest < ActiveRecord::TestCase
  fixtures :developers, :computers, :posts, :comments
  def test_association_methods_override_attribute_methods_of_same_name
    assert_equal(developers(:david), computers(:workstation).developer)
    # this next line will fail if the attribute methods module is generated lazily
    # after the association methods module is generated
    assert_equal(developers(:david), computers(:workstation).developer)
    assert_equal(developers(:david).id, computers(:workstation)[:developer])
  end

  def test_model_method_overrides_association_method
    assert_equal(comments(:greetings).body, posts(:welcome).first_comment)
  end
end