rails--rails/activerecord/test/inheritance_test.rb

require 'abstract_unit'
require 'fixtures/company'
require 'fixtures/project'

class InheritanceTest < Test::Unit::TestCase
  fixtures :companies, :projects

  def test_a_bad_type_column
    Company.connection.insert "INSERT INTO companies (id, type, name) VALUES(100, 'bad_class!', 'Not happening')"
    assert_raises(ActiveRecord::SubclassNotFound) { Company.find(100) }
  end

  def test_inheritance_find
    assert Company.find(1).kind_of?(Firm), "37signals should be a firm"
    assert Firm.find(1).kind_of?(Firm), "37signals should be a firm"
    assert Company.find(2).kind_of?(Client), "Summit should be a client"
    assert Client.find(2).kind_of?(Client), "Summit should be a client"
  end
  
  def test_alt_inheritance_find
    switch_to_alt_inheritance_column
    test_inheritance_find
  end

  def test_inheritance_find_all
    companies = Company.find_all(nil, "id")
    assert companies[0].kind_of?(Firm), "37signals should be a firm"
    assert companies[1].kind_of?(Client), "Summit should be a client"
  end
  
  def test_alt_inheritance_find_all
    switch_to_alt_inheritance_column
    test_inheritance_find_all
  end

  def test_inheritance_save
    firm = Firm.new
    firm.name = "Next Angle"
    firm.save
    
    next_angle = Company.find(firm.id)
    assert next_angle.kind_of?(Firm), "Next Angle should be a firm"
  end
  
  def test_alt_inheritance_save
    switch_to_alt_inheritance_column
    test_inheritance_save
  end

  def test_inheritance_condition
    assert_equal 3, Company.find_all.length
    assert_equal 1, Firm.find_all.length
    assert_equal 2, Client.find_all.length
  end
  
  def test_alt_inheritance_condition
    switch_to_alt_inheritance_column
    test_inheritance_condition
  end

  def test_finding_incorrect_type_data
    assert_raises(ActiveRecord::RecordNotFound) { Firm.find(2) }
    assert_nothing_raised   { Firm.find(1) }
  end
  
  def test_alt_finding_incorrect_type_data
    switch_to_alt_inheritance_column
    test_finding_incorrect_type_data
  end

  def test_update_all_within_inheritance
    Client.update_all "name = 'I am a client'"
    assert_equal "I am a client", Client.find_all.first.name
    assert_equal "37signals", Firm.find_all.first.name
  end
  
  def test_alt_update_all_within_inheritance
    switch_to_alt_inheritance_column
    test_update_all_within_inheritance
  end

  def test_destroy_all_within_inheritance
    Client.destroy_all
    assert_equal 0, Client.find_all.length
    assert_equal 1, Firm.find_all.length
  end
  
  def test_alt_destroy_all_within_inheritance
    switch_to_alt_inheritance_column
    test_destroy_all_within_inheritance
  end

  def test_find_first_within_inheritance
    assert_kind_of Firm, Company.find_first("name = '37signals'")
    assert_kind_of Firm, Firm.find_first("name = '37signals'")
    assert_nil Client.find_first("name = '37signals'")
  end
  
  def test_alt_find_first_within_inheritance
    switch_to_alt_inheritance_column
    test_find_first_within_inheritance
  end

  def test_complex_inheritance
    very_special_client = VerySpecialClient.create("name" => "veryspecial")
    assert_equal very_special_client, VerySpecialClient.find_first("name = 'veryspecial'")
    assert_equal very_special_client, SpecialClient.find_first("name = 'veryspecial'")
    assert_equal very_special_client, Company.find_first("name = 'veryspecial'")
    assert_equal very_special_client, Client.find_first("name = 'veryspecial'")
    assert_equal 1, Client.find_all("name = 'Summit'").size
    assert_equal very_special_client, Client.find(very_special_client.id)
  end

  def test_alt_complex_inheritance
    switch_to_alt_inheritance_column
    test_complex_inheritance
  end

  def test_inheritance_without_mapping
    assert_kind_of SpecialProject, SpecialProject.find(1)
    assert_nothing_raised { SpecialProject.create("name" => "And breaaaaathe!") }
    
  end

  private
    def switch_to_alt_inheritance_column
      # we don't want misleading test results, so get rid of the values in the type column
      Company.find_all(nil, "id").each do |c|
        c['type'] = nil
        c.save
      end
    
      def Company.inheritance_column() "ruby_type" end
    end
end