module ActiveModel::AttributeMethods::ClassMethods

end
end
send("#{attr}=", nil)
def clear_attribute(attr)
private

define_attribute_methods :name, :age, :address
# attribute_method_affix declarations.
# attribute_method_prefix, attribute_method_suffix or
# Call to define_attribute_methods must appear after the

attribute_method_prefix 'clear_'
attr_accessor :name, :age, :address

include ActiveModel::AttributeMethods
class Person

methods, or they will not hook in.
+define_attribute_methods+ after you define any prefix, suffix, or affix
To use, pass attribute names (as strings or symbols). Be sure to declare

+ActiveModel::AttributeMethods+.
Declares the attributes that should be prefixed and suffixed by

def define_attribute_methods(*attr_names)
  ActiveSupport::CodeGenerator.batch(generated_attribute_methods, __FILE__, __LINE__) do |owner|
    attr_names.flatten.each do |attr_name|
      define_attribute_method(attr_name, _owner: owner)
      aliases_by_attribute_name[attr_name.to_s].each do |aliased_name|
        generate_alias_attribute_methods owner, aliased_name, attr_name
      end
    end
  end
end