An Actual Use Case

gistfile1.rb

require 'sonian/use_cases/password_encryption'
require 'sonian/values/user'
require 'active_support/core_ext/object/blank'

module Sonian
  class CreateUser
    def initialize(account_vo, data_store)
      raise ArgumentError.new unless account_vo && data_store
      @account      = account_vo
      @user_gateway = data_store.user_gateway
    end

    def with_attributes(attributes)
      attrs = attributes.dup
      validate_attributes(attrs)
      attrs[:password] = PasswordEncryption.new.encrypt(attrs[:password])
      User.new(attrs).tap do |user|
        @user_gateway.add_user(@account, user)
      end
    end

    private

    def validate_attributes(attributes)
      username = attributes[:username]
      password = attributes[:password]
      raise ArgumentError.new("Username and password must not be blank") if username.blank? || password.blank?
    end
  end
end