module ActiveModel::Attributes::ClassMethods

person.active # => true
person.name # => "Volmer"

person.name = "Volmer"
person = Person.new

end
attribute :active, :boolean, default: true
attribute :name, :string

include ActiveModel::Attributes
class Person

supported by the given cast type.
type and default value may be specified, as well as any options
Defines a model attribute. In addition to the attribute name, a cast

:call-seq: attribute(name, cast_type = nil, default: nil, **options)
#

def attribute(name, ...)
  super
  define_attribute_method(name)
end