Value and form objects using the u-attributes gem

01_value_object.rb

require 'bundler/inline'
require 'digest'

gemfile do
  source 'https://rubygems.org'
  gem 'u-attributes', '~> 2.6.0'
end

class Password
  include Micro::Attributes.with(:initialize)

  attribute :value, default: -> value { String(value).strip },
                    protected: true

  def ==(password)
    self.value == Kind.of(self.class, password).value
  end

  def digest
    @digest ||= Digest::SHA256.hexdigest(value)
  end
end

Password.new('123456') == Password.new('123456') # true

Password.new('123456') == Password.new('123457') # false

02_form_object.rb

require 'bundler/inline'
require 'digest'

gemfile do
  source 'https://rubygems.org'
  gem 'u-attributes', '~> 2.6.0'
end

class SignUpParams
  include Micro::Attributes.with(:initialize, accept: :strict)

  TrimString = -> value { String(value).strip }

  attribute :email, default: TrimString, accept: -> str { str =~ /\A.+@.+\..+\z/ }
  
  attributes :password, :password_confirmation, default: TrimString, reject: :empty?, private: true

  def password_digest
    Digest::SHA256.hexdigest(password) if password == password_confirmation
  end
end

SignUpParams.new(email: nil, password: '', password_confirmation: "\n\r")
# ArgumentError (One or more attributes were rejected. Errors:)
# * "email" is invalid
# * "password" expected to not be empty?
# * "password_confirmation" expected to not be empty?

SignUpParams.new(email: '[email protected]', password: '123456', password_confirmation: '123456').password_digest
# "8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92"