example_6.rb

class UserSearch
  attr_reader :name, :email

  def initialize(options = {})
    @name  = options[:name]
    @email = options[:email]
  end

  def results
    scope = User.scoped
    scope = scope.name_matching(name) if scope_by_name?
    scope = scope.email_matching(email) if scope_by_email?
    scope
  end

  private

  def scope_by_name?
    name.present?
  end

  def scope_by_email?
    email.present?
  end
end