модуль ActiveRecord::AttributeMethods::PrimaryKey

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 17
def id
  if pk = self.class.primary_key
    sync_with_transaction_state
    _read_attribute(pk)
  end
end

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 25
def id=(value)
  sync_with_transaction_state
  write_attribute(self.class.primary_key, value) if self.class.primary_key
end

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 31
def id?
  sync_with_transaction_state
  query_attribute(self.class.primary_key)
end

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 37
def id_before_type_cast
  sync_with_transaction_state
  read_attribute_before_type_cast(self.class.primary_key)
end

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 43
def id_was
  sync_with_transaction_state
  attribute_was(self.class.primary_key)
end

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 10
def to_key
  sync_with_transaction_state
  key = self.id
  [key] if key
end

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 50
def attribute_method?(attr_name)
  attr_name == 'id' || super
end