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August 29, 2015 14:19
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Implementation "#to_h", returning a hash which includes the attribute name and its value
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| require 'set' # Railsの場合不要 | |
| module AttrAccessorExtension | |
| def to_h | |
| Hash[self.class.__send__(:attributes).sort.map { |name| [name, public_send(name)] }] | |
| end | |
| def self.included(klass) | |
| klass.extend(ClassMethods) | |
| end | |
| module ClassMethods | |
| private | |
| def attributes | |
| @attributes ||= superclass.respond_to?(:attributes, true) ? superclass.__send__(:attributes) : Set.new | |
| end | |
| def attr_reader(*names) | |
| super | |
| attributes.merge(names.map(&:to_sym)) | |
| end | |
| def attr_accessor(*names) | |
| super | |
| attributes.merge(names.map(&:to_sym)) | |
| end | |
| end | |
| end | |
| if $0 == __FILE__ | |
| class Hoge | |
| include AttrAccessorExtension | |
| attr_accessor :attr1, :attr2 | |
| end | |
| hoge = Hoge.new | |
| hoge.attr1 = 1 | |
| hoge.to_h # => {:attr1=>1, :attr2=>nil} | |
| end |
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