path: root/activerecord/test/base_test.rb

require 'abstract_unit'
require 'fixtures/topic'
require 'fixtures/reply'
require 'fixtures/company'
require 'fixtures/project'
require 'fixtures/default'
require 'fixtures/auto_id'
require 'fixtures/column_name'

class Category < ActiveRecord::Base; end
class Smarts < ActiveRecord::Base; end
class CreditCard < ActiveRecord::Base; end
class MasterCreditCard < ActiveRecord::Base; end

class LoosePerson < ActiveRecord::Base
  attr_protected :credit_rating, :administrator
end

class TightPerson < ActiveRecord::Base
  attr_accessible :name, :address
end

class TightDescendent < TightPerson
  attr_accessible :phone_number
end

class Booleantest < ActiveRecord::Base; end

class BasicsTest < Test::Unit::TestCase
  fixtures :topics, :companies, :projects

  def test_set_attributes
    topic = Topic.find(1)
    topic.attributes = { "title" => "Budget", "author_name" => "Jason" }
    topic.save
    assert_equal("Budget", topic.title)
    assert_equal("Jason", topic.author_name)
    assert_equal(@topics["first"]["author_email_address"], Topic.find(1).author_email_address)
  end
  
  def test_integers_as_nil
    Topic.update(1, "approved" => "")
    assert_nil Topic.find(1).approved
  end
  
  def test_set_attributes_with_block
    topic = Topic.new do |t|
      t.title       = "Budget"
      t.author_name = "Jason"
    end

    assert_equal("Budget", topic.title)
    assert_equal("Jason", topic.author_name)
  end
  
  def test_respond_to?
    topic = Topic.find(1)
    assert topic.respond_to?("title")
    assert topic.respond_to?("title?")
    assert topic.respond_to?("title=")
    assert topic.respond_to?(:title)
    assert topic.respond_to?(:title?)
    assert topic.respond_to?(:title=)
    assert topic.respond_to?("author_name")
    assert topic.respond_to?("attribute_names")
    assert !topic.respond_to?("nothingness")
    assert !topic.respond_to?(:nothingness)
  end
  
  def test_array_content
    topic = Topic.new
    topic.content = %w( one two three )
    topic.save

    assert_equal(%w( one two three ), Topic.find(topic.id).content)
  end

  def test_hash_content
    topic = Topic.new
    topic.content = { "one" => 1, "two" => 2 }
    topic.save

    assert_equal 2, Topic.find(topic.id).content["two"]
    
    topic.content["three"] = 3
    topic.save

    assert_equal 3, Topic.find(topic.id).content["three"]
  end
  
  def test_update_array_content
    topic = Topic.new
    topic.content = %w( one two three )

    topic.content.push "four"
    assert_equal(%w( one two three four ), topic.content)

    topic.save
    
    topic = Topic.find(topic.id)
    topic.content << "five"
    assert_equal(%w( one two three four five ), topic.content)
  end
 
  def test_attributes_hash
    assert_equal @projects['active_record'].to_hash, Project.find_first.attributes
  end

  def test_create
    topic = Topic.new
    topic.title = "New Topic"
    topic.save
    topicReloaded = Topic.find(topic.id)
    assert_equal("New Topic", topicReloaded.title)
  end
  
  def test_create_many
    topics = Topic.create([ { "title" => "first" }, { "title" => "second" }])
    assert_equal 2, topics.size
    assert_equal "first", topics.first.title
  end

  def test_create_columns_not_equal_attributes
    topic = Topic.new
    topic.title = 'Another New Topic'
    topic.send :write_attribute, 'does_not_exist', 'test'
    assert_nothing_raised { topic.save }
  end

  def test_create_through_factory
    topic = Topic.create("title" => "New Topic")
    topicReloaded = Topic.find(topic.id)
    assert_equal(topic, topicReloaded)
  end

  def test_update
    topic = Topic.new
    topic.title = "Another New Topic"
    topic.written_on = "2003-12-12 23:23:00"
    topic.save
    topicReloaded = Topic.find(topic.id)
    assert_equal("Another New Topic", topicReloaded.title)

    topicReloaded.title = "Updated topic"
    topicReloaded.save
    
    topicReloadedAgain = Topic.find(topic.id)
    
    assert_equal("Updated topic", topicReloadedAgain.title)
  end

  def test_update_columns_not_equal_attributes
    topic = Topic.new
    topic.title = "Still another topic"
    topic.save
    
    topicReloaded = Topic.find(topic.id)
    topicReloaded.title = "A New Topic"
    topicReloaded.send :write_attribute, 'does_not_exist', 'test'
    assert_nothing_raised { topicReloaded.save }
  end

  def test_preserving_date_objects
    # SQL Server doesn't have a separate column type just for dates, so all are returned as time
    if ActiveRecord::ConnectionAdapters.const_defined? :SQLServerAdapter
      return true if ActiveRecord::Base.connection.instance_of?(ActiveRecord::ConnectionAdapters::SQLServerAdapter)
    end

    assert_kind_of(
      Date, Topic.find(1).last_read, 
      "The last_read attribute should be of the Date class"
    )

    # Oracle does not have a TIME datatype.
    if ActiveRecord::ConnectionAdapters.const_defined? :OracleAdapter
      return true if ActiveRecord::Base.connection.instance_of?(ActiveRecord::ConnectionAdapters::OracleAdapter)
    end
    assert_kind_of(
      Time, Topic.find(1).bonus_time,
      "The bonus_time attribute should be of the Time class"
    )
  end

  def test_preserving_time_objects
    assert_kind_of(
      Time, Topic.find(1).written_on,
      "The written_on attribute should be of the Time class"
    )
  end
  
  def test_destroy
    topic = Topic.new
    topic.title = "Yet Another New Topic"
    topic.written_on = "2003-12-12 23:23:00"
    topic.save
    topic.destroy
    assert_raise(TypeError) { topic.save }
    assert_raise(ActiveRecord::RecordNotFound) { Topic.find(topic.id) }
  end
  
  def test_record_not_found_exception
    assert_raises(ActiveRecord::RecordNotFound) { topicReloaded = Topic.find(99999) }
  end
  
  def test_initialize_with_attributes
    topic = Topic.new({ 
      "title" => "initialized from attributes", "written_on" => "2003-12-12 23:23"
    })
    
    assert_equal("initialized from attributes", topic.title)
  end
  
  def test_initialize_with_invalid_attribute
    begin
      topic = Topic.new({ "title" => "test", 
        "last_read(1i)" => "2005", "last_read(2i)" => "2", "last_read(3i)" => "31"})
    rescue ActiveRecord::MultiparameterAssignmentErrors => ex
      assert_equal(1, ex.errors.size)
      assert_equal("last_read", ex.errors[0].attribute)
    end
  end
  
  def test_load
    topics = Topic.find_all nil, "id"    
    assert_equal(2, topics.size)
    assert_equal(@topics["first"]["title"], topics.first.title)
  end
  
  def test_load_with_condition
    topics = Topic.find_all "author_name = 'Mary'"
    
    assert_equal(1, topics.size)
    assert_equal(@topics["second"]["title"], topics.first.title)
  end

  def test_table_name_guesses
    assert_equal "topics", Topic.table_name
    
    assert_equal "categories", Category.table_name
    assert_equal "smarts", Smarts.table_name
    assert_equal "credit_cards", CreditCard.table_name
    assert_equal "master_credit_cards", MasterCreditCard.table_name

    ActiveRecord::Base.pluralize_table_names = false
    assert_equal "category", Category.table_name
    assert_equal "smarts", Smarts.table_name
    assert_equal "credit_card", CreditCard.table_name
    assert_equal "master_credit_card", MasterCreditCard.table_name
    ActiveRecord::Base.pluralize_table_names = true

    ActiveRecord::Base.table_name_prefix = "test_"
    assert_equal "test_categories", Category.table_name
    ActiveRecord::Base.table_name_suffix = "_test"
    assert_equal "test_categories_test", Category.table_name
    ActiveRecord::Base.table_name_prefix = ""
    assert_equal "categories_test", Category.table_name
    ActiveRecord::Base.table_name_suffix = ""
    assert_equal "categories", Category.table_name

    ActiveRecord::Base.pluralize_table_names = false
    ActiveRecord::Base.table_name_prefix = "test_"
    assert_equal "test_category", Category.table_name
    ActiveRecord::Base.table_name_suffix = "_test"
    assert_equal "test_category_test", Category.table_name
    ActiveRecord::Base.table_name_prefix = ""
    assert_equal "category_test", Category.table_name
    ActiveRecord::Base.table_name_suffix = ""
    assert_equal "category", Category.table_name
    ActiveRecord::Base.pluralize_table_names = true
  end
  
  def test_destroy_all
    assert_equal 2, Topic.find_all.size

    Topic.destroy_all "author_name = 'Mary'"
    assert_equal 1, Topic.find_all.size
  end

  def test_destroy_many
    Client.destroy([2, 3])
    assert_equal 0, Client.count
  end

  def test_delete_many
    Topic.delete([1, 2])
    assert_equal 0, Topic.count
  end

  def test_boolean_attributes
    assert ! Topic.find(1).approved?
    assert Topic.find(2).approved?
  end
  
  def test_increment_counter
    Topic.increment_counter("replies_count", 1)
    assert_equal 1, Topic.find(1).replies_count

    Topic.increment_counter("replies_count", 1)
    assert_equal 2, Topic.find(1).replies_count
  end
  
  def test_decrement_counter
    Topic.decrement_counter("replies_count", 2)
    assert_equal 1, Topic.find(2).replies_count

    Topic.decrement_counter("replies_count", 2)
    assert_equal 0, Topic.find(1).replies_count
  end
  
  def test_update_all
    assert_equal 2, Topic.update_all("content = 'bulk updated!'")
    assert_equal "bulk updated!", Topic.find(1).content
    assert_equal "bulk updated!", Topic.find(2).content
    assert_equal 2, Topic.update_all(['content = ?', 'bulk updated again!']);
    assert_equal "bulk updated again!", Topic.find(1).content
    assert_equal "bulk updated again!", Topic.find(2).content
  end

  def test_update_many
    topic_data = { "1" => { "content" => "1 updated" }, "2" => { "content" => "2 updated" } }
    updated = Topic.update(topic_data.keys, topic_data.values)

    assert_equal 2, updated.size
    assert_equal "1 updated", Topic.find(1).content
    assert_equal "2 updated", Topic.find(2).content
  end

  def test_delete_all
    assert_equal 2, Topic.delete_all
  end

  def test_update_by_condition
    Topic.update_all "content = 'bulk updated!'", "approved = 1"
    assert_equal "Have a nice day", Topic.find(1).content
    assert_equal "bulk updated!", Topic.find(2).content
  end
    
  def test_attribute_present
    t = Topic.new
    t.title = "hello there!"
    t.written_on = Time.now
    assert t.attribute_present?("title")
    assert t.attribute_present?("written_on")
    assert !t.attribute_present?("content")
  end
  
  def test_attribute_keys_on_new_instance
    t = Topic.new
    assert_equal nil, t.title, "The topics table has a title column, so it should be nil"
    assert_raise(NoMethodError) { t.title2 }
  end
  
  def test_class_name
    assert_equal "Firm", ActiveRecord::Base.class_name("firms")
    assert_equal "Category", ActiveRecord::Base.class_name("categories")
    assert_equal "AccountHolder", ActiveRecord::Base.class_name("account_holder")

    ActiveRecord::Base.pluralize_table_names = false
    assert_equal "Firms", ActiveRecord::Base.class_name( "firms" )
    ActiveRecord::Base.pluralize_table_names = true

    ActiveRecord::Base.table_name_prefix = "test_"
    assert_equal "Firm", ActiveRecord::Base.class_name( "test_firms" )
    ActiveRecord::Base.table_name_suffix = "_tests"
    assert_equal "Firm", ActiveRecord::Base.class_name( "test_firms_tests" )
    ActiveRecord::Base.table_name_prefix = ""
    assert_equal "Firm", ActiveRecord::Base.class_name( "firms_tests" )
    ActiveRecord::Base.table_name_suffix = ""
    assert_equal "Firm", ActiveRecord::Base.class_name( "firms" )
  end
  
  def test_null_fields
    assert_nil Topic.find(1).parent_id
    assert_nil Topic.create("title" => "Hey you").parent_id
  end
  
  def test_default_values
    topic = Topic.new
    assert_equal 1, topic.approved
    assert_nil topic.written_on
    assert_nil topic.bonus_time
    assert_nil topic.last_read
    
    topic.save

    topic = Topic.find(topic.id)
    assert_equal 1, topic.approved
    assert_nil topic.last_read
  end

  def test_utc_as_time_zone
    # Oracle does not have a TIME datatype.
    if ActiveRecord::ConnectionAdapters.const_defined? :OracleAdapter
      return true if ActiveRecord::Base.connection.instance_of?(ActiveRecord::ConnectionAdapters::OracleAdapter)
    end

    Topic.default_timezone = :utc
    attributes = { "bonus_time" => "5:42:00AM" }
    topic = Topic.find(1)
    topic.attributes = attributes
    assert_equal Time.utc(2000, 1, 1, 5, 42, 0), topic.bonus_time
    Topic.default_timezone = :local
  end

  def test_default_values_on_empty_strings
    topic = Topic.new
    topic.approved  = nil
    topic.last_read = nil

    topic.save

    topic = Topic.find(topic.id)
    assert_nil topic.last_read
    assert_nil topic.approved
  end
  
  def test_equality
    assert_equal Topic.find(1), Topic.find(2).parent
  end
  
  def test_hashing
    assert_equal [ Topic.find(1) ], [ Topic.find(2).parent ] & [ Topic.find(1) ]
  end
  
  def test_destroy_new_record
    client = Client.new
    client.destroy
    assert client.frozen?
  end
  
  def test_update_attribute
    assert !Topic.find(1).approved?
    Topic.find(1).update_attribute("approved", true)
    assert Topic.find(1).approved?

    Topic.find(1).update_attribute(:approved, false)
    assert !Topic.find(1).approved?
  end
  
  def test_mass_assignment_protection
    firm = Firm.new
    firm.attributes = { "name" => "Next Angle", "rating" => 5 }
    assert_equal 1, firm.rating
  end
  
  def test_mass_assignment_protection_on_defaults
    firm = Firm.new
    firm.attributes = { "id" => 5, "type" => "Client" }
    assert_nil firm.id
    assert_equal "Firm", firm[:type]
  end
  
  def test_mass_assignment_accessible
    reply = Reply.new("title" => "hello", "content" => "world", "approved" => 0)
    reply.save
    
    assert_equal 1, reply.approved
    
    reply.approved = 0
    reply.save

    assert_equal 0, reply.approved
  end
  
  def test_mass_assignment_protection_inheritance
    assert_equal [ :credit_rating, :administrator ], LoosePerson.protected_attributes
    assert_nil TightPerson.protected_attributes
  end

  def test_multiparameter_attributes_on_date
    # SQL Server doesn't have a separate column type just for dates, so all are returned as time
    if ActiveRecord::ConnectionAdapters.const_defined? :SQLServerAdapter
      return true if ActiveRecord::Base.connection.instance_of?(ActiveRecord::ConnectionAdapters::SQLServerAdapter)
    end

    attributes = { "last_read(1i)" => "2004", "last_read(2i)" => "6", "last_read(3i)" => "24" }
    topic = Topic.find(1)
    topic.attributes = attributes
    assert_equal Date.new(2004, 6, 24).to_s, topic.last_read.to_s
  end

  def test_multiparameter_attributes_on_date_with_empty_date
    # SQL Server doesn't have a separate column type just for dates, so all are returned as time
    if ActiveRecord::ConnectionAdapters.const_defined? :SQLServerAdapter
      return true if ActiveRecord::Base.connection.instance_of?(ActiveRecord::ConnectionAdapters::SQLServerAdapter)
    end

    attributes = { "last_read(1i)" => "2004", "last_read(2i)" => "6", "last_read(3i)" => "" }
    topic = Topic.find(1)
    topic.attributes = attributes
    assert_equal Date.new(2004, 6, 1).to_s, topic.last_read.to_s
  end

  def test_multiparameter_attributes_on_date_with_all_empty
    attributes = { "last_read(1i)" => "", "last_read(2i)" => "", "last_read(3i)" => "" }
    topic = Topic.find(1)
    topic.attributes = attributes
    assert_nil topic.last_read
  end

  def test_multiparameter_attributes_on_time
    attributes = { 
      "written_on(1i)" => "2004", "written_on(2i)" => "6", "written_on(3i)" => "24", 
      "written_on(4i)" => "16", "written_on(5i)" => "24", "written_on(6i)" => "00"
    }
    topic = Topic.find(1)
    topic.attributes = attributes
    assert_equal Time.local(2004, 6, 24, 16, 24, 0), topic.written_on
  end

  def test_multiparameter_attributes_on_time_with_empty_seconds
    attributes = { 
      "written_on(1i)" => "2004", "written_on(2i)" => "6", "written_on(3i)" => "24", 
      "written_on(4i)" => "16", "written_on(5i)" => "24", "written_on(6i)" => ""
    }
    topic = Topic.find(1)
    topic.attributes = attributes
    assert_equal Time.local(2004, 6, 24, 16, 24, 0), topic.written_on
  end

  def test_attributes_on_dummy_time
    # Oracle does not have a TIME datatype.
    if ActiveRecord::ConnectionAdapters.const_defined? :OracleAdapter
      return true if ActiveRecord::Base.connection.instance_of?(ActiveRecord::ConnectionAdapters::OracleAdapter)
    end

    attributes = {
      "bonus_time" => "5:42:00AM"
    }
    topic = Topic.find(1)
    topic.attributes = attributes
    assert_equal Time.local(2000, 1, 1, 5, 42, 0), topic.bonus_time
  end

  def test_boolean
    b_false = Booleantest.create({ "value" => false })
    false_id = b_false.id
    b_true = Booleantest.create({ "value" => true })
    true_id = b_true.id

    b_false = Booleantest.find(false_id)
    assert !b_false.value?
    b_true = Booleantest.find(true_id)
    assert b_true.value?
  end
  
  def test_clone
    topic = Topic.find(1)
    cloned_topic = topic.clone
    assert_equal topic.title, cloned_topic.title
    assert cloned_topic.new_record?

    # test if the attributes have been cloned
    topic.title = "a" 
    cloned_topic.title = "b" 
    assert_equal "a", topic.title
    assert_equal "b", cloned_topic.title

    # test if the attribute values have been cloned
    topic.title = {"a" => "b"}
    cloned_topic = topic.clone
    cloned_topic.title["a"] = "c" 
    assert_equal "b", topic.title["a"]

    cloned_topic.save
    assert !cloned_topic.new_record?
    assert cloned_topic.id != topic.id
  end
  
  def test_bignum
    company = Company.find(1)
    company.rating = 2147483647
    company.save
    company = Company.find(1)
    assert_equal 2147483647, company.rating
  end

  def test_default
    if Default.connection.class.name == 'ActiveRecord::ConnectionAdapters::PostgreSQLAdapter'
      default = Default.new
  
      # dates / timestamps
      time_format = "%m/%d/%Y %H:%M"
      assert_equal Time.now.strftime(time_format), default.modified_time.strftime(time_format)
      assert_equal Date.today, default.modified_date
  
      # fixed dates / times
      assert_equal Date.new(2004, 1, 1), default.fixed_date
      assert_equal Time.local(2004, 1,1,0,0,0,0), default.fixed_time
  
      # char types
      assert_equal 'Y', default.char1
      assert_equal 'a varchar field', default.char2
      assert_equal 'a text field', default.char3
    end
  end

  def test_auto_id
    auto = AutoId.new
    auto.save
    assert (auto.id > 0)
  end
  
  def quote_column_name(name)
    "<#{name}>"
  end

  def test_quote_keys
    ar = AutoId.new
    source = {"foo" => "bar", "baz" => "quux"}
    actual = ar.send(:quote_columns, self, source)
    inverted = actual.invert
    assert_equal("<foo>", inverted["bar"])
    assert_equal("<baz>", inverted["quux"])
  end

  def test_column_name_properly_quoted
    col_record = ColumnName.new
    col_record.references = 40
    col_record.save
    col_record.references = 41
    col_record.save
    c2 = ColumnName.find(col_record.id)
    assert_equal(41, c2.references)
  end

  MyObject = Struct.new :attribute1, :attribute2
  
  def test_serialized_attribute
    myobj = MyObject.new('value1', 'value2')
    topic = Topic.create("content" => myobj)  
    Topic.serialize("content", MyObject)
    assert_equal(myobj, topic.content)
  end

  def test_serialized_attribute_with_class_constraint
    myobj = MyObject.new('value1', 'value2')
    topic = Topic.create("content" => myobj)
    Topic.serialize(:content, Hash)

    assert_raise(ActiveRecord::SerializationTypeMismatch) { Topic.find(topic.id).content }

    settings = { "color" => "blue" }
    Topic.find(topic.id).update_attribute("content", settings)
    assert_equal(settings, Topic.find(topic.id).content)
    Topic.serialize(:content)
  end

  def test_quote
    content = "\\ \001 ' \n \\n \""
    topic = Topic.create('content' => content)
    assert_equal content, Topic.find(topic.id).content
  end
  
  def test_class_level_destroy
    should_be_destroyed_reply = Reply.create("title" => "hello", "content" => "world")
    Topic.find(1).replies << should_be_destroyed_reply

    Topic.destroy(1)
    assert_raise(ActiveRecord::RecordNotFound) { Topic.find(1) }
    assert_raise(ActiveRecord::RecordNotFound) { Reply.find(should_be_destroyed_reply.id) }
  end

  def test_class_level_delete
    should_be_destroyed_reply = Reply.create("title" => "hello", "content" => "world")
    Topic.find(1).replies << should_be_destroyed_reply

    Topic.delete(1)
    assert_raise(ActiveRecord::RecordNotFound) { Topic.find(1) }
    assert_nothing_raised { Reply.find(should_be_destroyed_reply.id) }
  end

  def test_increment_attribute
    assert_equal 0, @topics["first"].find.replies_count
    @topics["first"].find.increment! :replies_count
    assert_equal 1, @topics["first"].find.replies_count
    
    @topics["first"].find.increment(:replies_count).increment!(:replies_count)
    assert_equal 3, @topics["first"].find.replies_count
  end
  
  def test_increment_nil_attribute
    assert_nil @topics["first"].find.parent_id
    @topics["first"].find.increment! :parent_id
    assert_equal 1, @topics["first"].find.parent_id
  end
  
  def test_decrement_attribute
    @topics["first"].find.increment(:replies_count).increment!(:replies_count)
    assert_equal 2, @topics["first"].find.replies_count
    
    @topics["first"].find.decrement!(:replies_count)
    assert_equal 1, @topics["first"].find.replies_count

    @topics["first"].find.decrement(:replies_count).decrement!(:replies_count)
    assert_equal -1, @topics["first"].find.replies_count
  end
  
  def test_toggle_attribute
    assert !@topics["first"].find.approved?
    @topics["first"].find.toggle!(:approved)
    assert @topics["first"].find.approved?
  end

  def test_reload
    t1 = Topic.find(1)
    t2 = Topic.find(1)
    t1.title = "something else"
    t1.save
    t2.reload
    assert_equal t1.title, t2.title
  end

  def test_define_attr_method_with_value
    k = Class.new( ActiveRecord::Base )
    k.send(:define_attr_method, :table_name, "foo")
    assert_equal "foo", k.table_name
  end

  def test_define_attr_method_with_block
    k = Class.new( ActiveRecord::Base )
    k.send(:define_attr_method, :primary_key) { "sys_" + original_primary_key }
    assert_equal "sys_id", k.primary_key
  end

  def test_set_table_name_with_value
    k = Class.new( ActiveRecord::Base )
    k.table_name = "foo"
    assert_equal "foo", k.table_name
    k.set_table_name "bar"
    assert_equal "bar", k.table_name
  end

  def test_set_table_name_with_block
    k = Class.new( ActiveRecord::Base )
    k.set_table_name { "ks" }
    assert_equal "ks", k.table_name
  end

  def test_set_primary_key_with_value
    k = Class.new( ActiveRecord::Base )
    k.primary_key = "foo"
    assert_equal "foo", k.primary_key
    k.set_primary_key "bar"
    assert_equal "bar", k.primary_key
  end

  def test_set_primary_key_with_block
    k = Class.new( ActiveRecord::Base )
    k.set_primary_key { "sys_" + original_primary_key }
    assert_equal "sys_id", k.primary_key
  end

  def test_set_inheritance_column_with_value
    k = Class.new( ActiveRecord::Base )
    k.inheritance_column = "foo"
    assert_equal "foo", k.inheritance_column
    k.set_inheritance_column "bar"
    assert_equal "bar", k.inheritance_column
  end

  def test_set_inheritance_column_with_block
    k = Class.new( ActiveRecord::Base )
    k.set_inheritance_column { original_inheritance_column + "_id" }
    assert_equal "type_id", k.inheritance_column
  end
end