04: UserService implementation

implementation.rb

# services/user_service/implementation.rb

class UserService

  USER_ATTRIBUTES = %w(id full_name email phone_number)
  
  def initialize(mail_service)
    @mail_service = mail_service
  end
  
  def get_all_users()
    User.all.map &method(:to_serializable)
  end

  def create_user(user_properties)
    user = to_serializable(User.create!(user_properties))
    @mail_service.send_email '[email protected]', user['email'], 'subj', 'body'
    user
  end

private
  # make sure we don't try to respond with something that 
  # doesn't conform to the IDL (like timestamps and such)
  def to_serializable(user_model)
    user_model.serializable_hash.slice *USER_ATTRIBUTES
  end

end