```ruby
module Bourgeois
  module ViewHelper
    # Wrap a resource or a collection into its related presenter
    #
    # @example
    #   present User.new(name: 'Remi') do |user|
    #     puts user.inspect # => #<UserPresenter object=#<User name="Remi>>
    #     puts user.name # => Remi
    #   end
    def present(object, klass = nil, &blk)
      return object.map { |o| present(o, klass, &blk) } if object.respond_to?(:to_a)

      presenter = nil
      if klass.blank?
        if object.is_a?(Bourgeois::Presenter)
          presenter = object
        else
          begin
            klass_name = "#{object.class}Presenter"
            klass = klass_name.constantize
          rescue ::NameError
            raise UnknownPresenter.new(klass_name)
          end
        end
      end

      presenter ||= klass.new(object, self)
      yield presenter if block_given?

      presenter
    end
  end
end
```

Remove useless presenter = nil
user
```ruby
module Bourgeois
  module ViewHelper
    # Wrap a resource or a collection into its related presenter
    #
    # @example
    #   present User.new(name: 'Remi') do |user|
    #     puts user.inspect # => #<UserPresenter object=#<User name="Remi>>
    #     puts user.name # => Remi
    #   end
    def present(object, klass = nil, &blk)
      return object.map { |o| present(o, klass, &blk) } if object.respond_to?(:to_a)

      if klass.blank?
        if object.is_a?(Bourgeois::Presenter)
          presenter = object
        else
          begin
            klass_name = "#{object.class}Presenter"
            klass = klass_name.constantize
          rescue ::NameError
            raise UnknownPresenter.new(klass_name)
          end
        end
      end

      presenter ||= klass.new(object, self)
      yield presenter if block_given?

      presenter
    end
  end
end
```
assistant