gem 'dry-initializer'

require 'dry-initializer'

class User
  extend Dry::Initializer::Mixin

  # Params of the initializer along with corresponding readers
  param  :name
  param  :role, default: proc { 'customer' }
  # Options of the initializer along with corresponding readers
  option :admin, default: proc { false }
end

# Defines the initializer with params and options
user = User.new 'Vladimir', 'admin', admin: true

# Defines readers for single attributes
user.name  # => 'Vladimir'
user.role  # => 'admin'
user.admin # => true