If you want to add extra data in draper you can use :context option.

person.rb

class Persion < Draper::Decorator
  is_admin?
    context[:role] == 'admin'
  end
end

then you can pass option for each person object.

  person_a = Person.decorate(people[0], context: {role: 'admin'})
  person_b = Person.decorate(people[1], context: {role: 'normal'})

  puts person_a.is_admin? # return true
  puts person_b.is_admin? # return false