Returns the value of the attribute identified by attr_name after it has been type cast. For example, a date attribute will cast “2004-12-12” to Date.new(2004, 12, 12). (For information about specific type casting behavior, see the types under ActiveModel::Type.)

# File activerecord/lib/active_record/attribute_methods/read.rb, line 29
def read_attribute(attr_name, &block)
  name = attr_name.to_s
  name = self.class.attribute_aliases[name] || name

  @attributes.fetch_value(name, &block)
end